Rana zia ur rehman
My first presentation in my undergraduate Engineering Career.
Graduate Reseracher at KASIT (Korea Advanced of science & Technology)
My Email ID: ranazia517@gmail.com
Nonmetallic materials include polymers, which have a repeating molecular structure based on carbon backbones. There are different types of polymers including linear, branched, crosslinked, and network polymers. Polymers are useful because they are lightweight, corrosion resistant, easy to process at low temperatures, and inexpensive. Polymers can be categorized as thermoplastics, which soften when heated and harden when cooled, or thermosets, which become permanently hardened after an initial heating and cooling cycle. Common thermoplastics and thermosets along with their applications are discussed.
The document discusses polymers and their uses in everyday life. It provides information on different types of polymers like polyethylene, polypropylene, polystyrene, poly(methyl methacrylate), poly(vinyl chloride) and discusses their structures, properties and applications. The document also discusses the synthesis and uses of important polymers.
Plastic is a synthetic material made from organic polymers that can be molded into various shapes. There are two main types of plastics: thermoplastics and thermoset plastics. Thermoplastics soften when heated and harden when cooled, allowing them to be remolded and recycled. Thermoset plastics harden permanently once molded. Plastics have a variety of applications due to their properties like corrosion resistance, low cost, and ability to be molded into complex shapes. However, they also have weaknesses like low strength and sensitivity to heat and chemicals.
Polymer materials are long chain molecules made of repeating monomer units. They include plastics, rubbers, and fibers. Polymers are classified as thermoplastics, thermosets, homopolymers, copolymers, and natural polymers. The structure and properties of polymers depend on factors like chain length, branching, and cross-linking. Polymers have a variety of applications including packaging, insulation, automotive and medical parts due to their low cost, low density, and moldability.
This document provides an overview of polymers and includes:
- Definitions of monomers, polymers, and macromolecules and examples of natural and synthetic polymers.
- Explanations of addition and condensation polymerization reactions and examples such as polyethylene, nylon, and polyester.
- Descriptions of uses for common polymers like polyethylene, PVC, nylon, and polyester.
- Tests for identifying polymers like starch, fats, and reducing sugars.
- Advantages and disadvantages of plastic polymers and environmental issues with plastic waste.
This document provides an overview of polymers including their types, classifications, characteristics, and applications. It defines polymers as large molecules formed from monomers linking together in chains. Polymers are classified as natural, synthetic, or semisynthetic and characterized by their structure, including linear, branched, cross-linked, and network forms. Common polymers are used in medicine, consumer products, industry, and sports due to their light weight, low cost, and moldability.
Rana zia ur rehman
My first presentation in my undergraduate Engineering Career.
Graduate Reseracher at KASIT (Korea Advanced of science & Technology)
My Email ID: ranazia517@gmail.com
Nonmetallic materials include polymers, which have a repeating molecular structure based on carbon backbones. There are different types of polymers including linear, branched, crosslinked, and network polymers. Polymers are useful because they are lightweight, corrosion resistant, easy to process at low temperatures, and inexpensive. Polymers can be categorized as thermoplastics, which soften when heated and harden when cooled, or thermosets, which become permanently hardened after an initial heating and cooling cycle. Common thermoplastics and thermosets along with their applications are discussed.
The document discusses polymers and their uses in everyday life. It provides information on different types of polymers like polyethylene, polypropylene, polystyrene, poly(methyl methacrylate), poly(vinyl chloride) and discusses their structures, properties and applications. The document also discusses the synthesis and uses of important polymers.
Plastic is a synthetic material made from organic polymers that can be molded into various shapes. There are two main types of plastics: thermoplastics and thermoset plastics. Thermoplastics soften when heated and harden when cooled, allowing them to be remolded and recycled. Thermoset plastics harden permanently once molded. Plastics have a variety of applications due to their properties like corrosion resistance, low cost, and ability to be molded into complex shapes. However, they also have weaknesses like low strength and sensitivity to heat and chemicals.
Polymer materials are long chain molecules made of repeating monomer units. They include plastics, rubbers, and fibers. Polymers are classified as thermoplastics, thermosets, homopolymers, copolymers, and natural polymers. The structure and properties of polymers depend on factors like chain length, branching, and cross-linking. Polymers have a variety of applications including packaging, insulation, automotive and medical parts due to their low cost, low density, and moldability.
This document provides an overview of polymers and includes:
- Definitions of monomers, polymers, and macromolecules and examples of natural and synthetic polymers.
- Explanations of addition and condensation polymerization reactions and examples such as polyethylene, nylon, and polyester.
- Descriptions of uses for common polymers like polyethylene, PVC, nylon, and polyester.
- Tests for identifying polymers like starch, fats, and reducing sugars.
- Advantages and disadvantages of plastic polymers and environmental issues with plastic waste.
This document provides an overview of polymers including their types, classifications, characteristics, and applications. It defines polymers as large molecules formed from monomers linking together in chains. Polymers are classified as natural, synthetic, or semisynthetic and characterized by their structure, including linear, branched, cross-linked, and network forms. Common polymers are used in medicine, consumer products, industry, and sports due to their light weight, low cost, and moldability.
This document discusses melamine polymer. It begins by defining polymers and their types, including thermoplastics and thermosets. It then discusses the two main polymerization reactions: addition polymerization and condensation polymerization. The document provides a history of melamine, noting its discovery in 1834 and its increasing use in the 1930s. It describes melamine as a synthetic homopolymer containing nitrogen. The industrial production of melamine from urea is outlined in two steps. Common applications of melamine include dinnerware, whiteboards, paper products, textiles, tires, paints, and flame retardants. Finally, references on the history and uses of melamine are provided.
Polymers and its Classifications - Joan AlvaresBebeto G
Polymers are large molecules formed from repetitive monomeric units. There are several types of polymers including natural polymers like DNA, homopolymers made of a single monomer, and copolymers made of two or more different monomers. Polymers can also be classified as thermoplastics, thermosets, and long chain polymers based on their properties. Some key uses of polymers include applications in medicine like implants, consumer products like plastic containers, and industrial uses like automobile parts and pipes.
Polymers are large molecules formed by chemical bonding of many smaller molecules called monomers. There are two main types of polymers: thermoplastics and thermosets. Thermoplastics can be remelted and reshaped, while thermosets harden permanently after heating. Common polymerization reactions include bulk, suspension, solution, and emulsion polymerization. Biodegradable polymers break down into natural byproducts, while bioplastics are made from renewable sources. Polymer properties depend on factors like tacticity, polydispersity index, and glass transition temperature. Examples of important polymers include polyethylene, nylon, polyesters, PVC, Teflon, and conducting polymers.
This document discusses synthetic polymers. Synthetic polymers are man-made polymers created through chemical processes in laboratories by linking monomers together. Examples of synthetic polymers include plastics, fibers, and elastomers. While synthetic polymers have many applications, they also cause pollution problems as most are non-biodegradable. Methods to address this include reducing use, reusing and recycling polymers, as well as developing biodegradable polymers.
This document discusses various types of plastics, additives, and production processes. It describes the molecular structures of polymers as linear, branched, or cross-linked. It also explains the three main polymerization reactions - addition, condensation, and copolymerization. Finally, it outlines several common plastic materials and processing methods like injection molding, blow molding, and vacuum forming.
Rubbers, also known as elastomers, are linear polymers that exhibit distinct elastic properties. Natural rubber is obtained from the latex of the Hevea brasiliensis tree. The latex undergoes various processing steps including coagulation, creping, and smoking to produce rubber sheets. Rubber is then masticated and compounded with chemicals like sulfur for vulcanization to improve properties like tensile strength and heat resistance. Styrene-butadiene rubber is a synthetic rubber produced by copolymerizing butadiene and styrene, giving properties like abrasion resistance useful in tires. Conducting polymers can transport charge and conduct electricity through conjugated systems and doping to generate charge carriers along polymer chains.
A polymer is formed from small molecular units called monomers that join together in long chains through chemical bonds. There are different types of polymers classified by their monomer structure and occurrence. Common synthetic polymers include plastics like polyethylene, polyvinyl chloride, and epoxy resin. These polymers have various applications due to their properties such as corrosion resistance, low cost, and ability to be molded into complex shapes.
Polymers are large molecules composed of repeating structural units called monomers connected by covalent bonds. There are two types of polymers: natural polymers found in living things, and synthetic polymers created through chemical processes. Some key points:
- Synthetic polymers can be divided into plastics, fibers, and elastomers. Common plastics include polyethylene, polyamide, and nylon.
- Polymer properties depend on factors like chain length, side groups, and cross-linking. Different polymers have various advantages and disadvantages for applications.
- Non-biodegradable synthetic polymers cause pollution problems if not properly disposed of or recycled. Methods to address this include reuse, reduction, recycling, and developing biode
Synthetic polymers are widely used as substitutes for materials like metals, wood, cotton and glass. They have properties like low density, resistance to chemicals, flexibility and the ability to be molded into different shapes. Common synthetic polymers include polyethylene, polyester, nylon and polypropylene. Polymers can be thermoplastics, which soften when heated and harden when cooled, allowing reshaping, or thermosets, which remain rigid. Conductive polymers can transport electricity through conjugated pi electrons on their backbone, making them semiconductors when doped. Applications include medical devices, packaging and conductive fabrics.
Plastic is any of a wide range of synthetic or semi-synthetic materials that are moldable. Most plastics are derived from petrochemicals but some are partially natural. Plastics have a variety of properties including strength, flexibility, durability and the ability to be easily molded. There are two main types of plastics - thermoplastics, which soften when heated and can be reshaped, and thermosets, which cannot be reshaped after manufacture. Common plastics include polyvinyl chloride (PVC), polyethylene, and polypropylene, each with different chemical compositions and physical properties used in a wide range of applications.
This document discusses plastics and polymers. It provides examples of applications where polymers are replacing metals, such as in domestic appliances, toys, sports goods, and automobiles. It then describes the different types of plastics - thermoplastics, thermosets, and elastomers. Thermoplastics can be remelted and reshaped, thermosets form irreversible chemical bonds during curing, and elastomers provide elasticity. Examples of uses for polymers in medical applications and sports are also highlighted.
The document provides an introduction to polymers including definitions and classifications. It discusses that polymers are large molecules composed of repeating structural units called monomers. Polymerization is the process of forming polymers from monomers. Polymers can be classified based on their response to heat, type of polymerization reaction, chemical structure, and physical structure. The key properties of polymers like strength, plasticity, chemical resistance, physical state, glass transition temperature, and mechanical properties are also summarized. Finally, some major polymer-based industries like plastics, rubber, fibers, and coatings are listed.
Elastomers, also known as rubbers, are polymers that are elastic and flexible. They have low Young's modulus and high failure strain compared to other materials. Elastomers exist above their glass transition temperature, allowing considerable segmental motion. Common elastomers include natural rubber and synthetic rubbers like polyisoprene, butadiene rubber, nitrile butadiene rubber, chloroprene rubber, thermoplastic elastomers, fluoroelastomers, and silicones. Elastomers are usually thermosets that require vulcanization, but can also be thermoplastics. They are characterized by large elastic elongation, the ability to stretch and return to their original shape, and flexibility.
Polymers are giant molecules composed of repeating structural units joined together. They can be classified based on their origin (natural, semi-synthetic, synthetic), thermal response (thermoplastic, thermosetting), structure (linear, branched, cross-linked), and application (rubber, plastic, fibers). Polymerization is the process of linking monomers together to form polymers. It occurs via two main mechanisms: step-growth polymerization (condensation polymerization) and chain-growth polymerization (addition polymerization). Step-growth involves the elimination of a small molecule as monomers react together in a step-wise manner, while chain-growth is a chain reaction with no byproducts as monomers continuously add to the
Plastics can be used as building materials due to their beneficial properties such as strength, durability, resistance to water and corrosion, and low cost. There are two main types of plastics - thermoplastics, which soften when heated and harden when cooled and can be repeatedly reformed, and thermosetting plastics, which permanently harden during heating and cannot be remelted or remolded. Common applications of plastics in construction include pipes, cables, flooring, roofing, windows, and structural plastic composites reinforced with fibers.
This presentation contains the synthesis, properties and applications of synthetic Resins like Phenol Formaldehyde,Urea Formaldehyde and Melamine formaldehyde.
Thermosetting plastics cannot be remelted or reshaped once formed because their molecules are strongly cross-linked in three dimensions. Examples include epoxy, polyurethane, melamine formaldehyde, and urea formaldehyde. In contrast, thermoplastics can be remelted and reshaped multiple times for recycling, but their quality degrades with each reshaping. Common uses of thermosetting plastics include glues, plastics, electrical insulators, and boat hulls.
POLYMERS : PLASTICS AND THERMOPLASTICSSahil Nagpal
This document provides an overview of plastics and rubber, including their history, key developments, types, properties, manufacturing processes, and recycling. Some of the main points covered include:
- The first man-made plastic was Parkesine created in 1862; major early developments included celluloid, Bakelite, and nylon.
- Thermoplastics can be remelted and remolded, while thermosets chemically decompose when heated.
- Plastics are lightweight, durable, versatile materials but take a long time to decompose without proper disposal and recycling.
This document discusses thermoplastic elastomers (TPEs). TPEs have both thermoplastic and elastomeric properties. They can be melt-processed like thermoplastics but are flexible and elastic like vulcanized rubbers. The most common TPE is a styrene-butadiene block copolymer, which has rigid polystyrene end blocks and soft polybutadiene mid blocks. This structure allows it to behave like a rubber at low temperatures but melt and flow like a thermoplastic at higher temperatures. Common applications of TPEs include automotive parts, medical devices, shoes, and cables due to advantages like recyclability and simpler processing compared to thermoset rubbers
This document discusses using Redux with Polymer frameworks. It notes that Polymer components are decentralized while data needs centralization, creating problems with asynchronous state changes. Redux is presented as a solution with its principles of single state source, read-only state, and pure function changes. It describes connecting Polymer and Redux through a binding library, dispatching actions, and using selectors to optimize data access. Best practices are outlined like splitting UI/data code, matching store shape to components, and resolving clashes between Polymer mutations and Redux immutability.
Melting point is influenced by molecular arrangement and crystal size and structure. Polyesters like PET, PPT, and PBT have different melting points depending on their chemical structure, with PET melting at 265°C. Nylon polymers have varying melting points based on their chain length, with nylon 6 melting at 230°C, nylon 10 estimated to melt between 185-210°C, and nylon 12 at 180°C. For polymers, melting temperature refers to the transition from crystalline solid phase to amorphous solid phase rather than a complete melt.
This document discusses melamine polymer. It begins by defining polymers and their types, including thermoplastics and thermosets. It then discusses the two main polymerization reactions: addition polymerization and condensation polymerization. The document provides a history of melamine, noting its discovery in 1834 and its increasing use in the 1930s. It describes melamine as a synthetic homopolymer containing nitrogen. The industrial production of melamine from urea is outlined in two steps. Common applications of melamine include dinnerware, whiteboards, paper products, textiles, tires, paints, and flame retardants. Finally, references on the history and uses of melamine are provided.
Polymers and its Classifications - Joan AlvaresBebeto G
Polymers are large molecules formed from repetitive monomeric units. There are several types of polymers including natural polymers like DNA, homopolymers made of a single monomer, and copolymers made of two or more different monomers. Polymers can also be classified as thermoplastics, thermosets, and long chain polymers based on their properties. Some key uses of polymers include applications in medicine like implants, consumer products like plastic containers, and industrial uses like automobile parts and pipes.
Polymers are large molecules formed by chemical bonding of many smaller molecules called monomers. There are two main types of polymers: thermoplastics and thermosets. Thermoplastics can be remelted and reshaped, while thermosets harden permanently after heating. Common polymerization reactions include bulk, suspension, solution, and emulsion polymerization. Biodegradable polymers break down into natural byproducts, while bioplastics are made from renewable sources. Polymer properties depend on factors like tacticity, polydispersity index, and glass transition temperature. Examples of important polymers include polyethylene, nylon, polyesters, PVC, Teflon, and conducting polymers.
This document discusses synthetic polymers. Synthetic polymers are man-made polymers created through chemical processes in laboratories by linking monomers together. Examples of synthetic polymers include plastics, fibers, and elastomers. While synthetic polymers have many applications, they also cause pollution problems as most are non-biodegradable. Methods to address this include reducing use, reusing and recycling polymers, as well as developing biodegradable polymers.
This document discusses various types of plastics, additives, and production processes. It describes the molecular structures of polymers as linear, branched, or cross-linked. It also explains the three main polymerization reactions - addition, condensation, and copolymerization. Finally, it outlines several common plastic materials and processing methods like injection molding, blow molding, and vacuum forming.
Rubbers, also known as elastomers, are linear polymers that exhibit distinct elastic properties. Natural rubber is obtained from the latex of the Hevea brasiliensis tree. The latex undergoes various processing steps including coagulation, creping, and smoking to produce rubber sheets. Rubber is then masticated and compounded with chemicals like sulfur for vulcanization to improve properties like tensile strength and heat resistance. Styrene-butadiene rubber is a synthetic rubber produced by copolymerizing butadiene and styrene, giving properties like abrasion resistance useful in tires. Conducting polymers can transport charge and conduct electricity through conjugated systems and doping to generate charge carriers along polymer chains.
A polymer is formed from small molecular units called monomers that join together in long chains through chemical bonds. There are different types of polymers classified by their monomer structure and occurrence. Common synthetic polymers include plastics like polyethylene, polyvinyl chloride, and epoxy resin. These polymers have various applications due to their properties such as corrosion resistance, low cost, and ability to be molded into complex shapes.
Polymers are large molecules composed of repeating structural units called monomers connected by covalent bonds. There are two types of polymers: natural polymers found in living things, and synthetic polymers created through chemical processes. Some key points:
- Synthetic polymers can be divided into plastics, fibers, and elastomers. Common plastics include polyethylene, polyamide, and nylon.
- Polymer properties depend on factors like chain length, side groups, and cross-linking. Different polymers have various advantages and disadvantages for applications.
- Non-biodegradable synthetic polymers cause pollution problems if not properly disposed of or recycled. Methods to address this include reuse, reduction, recycling, and developing biode
Synthetic polymers are widely used as substitutes for materials like metals, wood, cotton and glass. They have properties like low density, resistance to chemicals, flexibility and the ability to be molded into different shapes. Common synthetic polymers include polyethylene, polyester, nylon and polypropylene. Polymers can be thermoplastics, which soften when heated and harden when cooled, allowing reshaping, or thermosets, which remain rigid. Conductive polymers can transport electricity through conjugated pi electrons on their backbone, making them semiconductors when doped. Applications include medical devices, packaging and conductive fabrics.
Plastic is any of a wide range of synthetic or semi-synthetic materials that are moldable. Most plastics are derived from petrochemicals but some are partially natural. Plastics have a variety of properties including strength, flexibility, durability and the ability to be easily molded. There are two main types of plastics - thermoplastics, which soften when heated and can be reshaped, and thermosets, which cannot be reshaped after manufacture. Common plastics include polyvinyl chloride (PVC), polyethylene, and polypropylene, each with different chemical compositions and physical properties used in a wide range of applications.
This document discusses plastics and polymers. It provides examples of applications where polymers are replacing metals, such as in domestic appliances, toys, sports goods, and automobiles. It then describes the different types of plastics - thermoplastics, thermosets, and elastomers. Thermoplastics can be remelted and reshaped, thermosets form irreversible chemical bonds during curing, and elastomers provide elasticity. Examples of uses for polymers in medical applications and sports are also highlighted.
The document provides an introduction to polymers including definitions and classifications. It discusses that polymers are large molecules composed of repeating structural units called monomers. Polymerization is the process of forming polymers from monomers. Polymers can be classified based on their response to heat, type of polymerization reaction, chemical structure, and physical structure. The key properties of polymers like strength, plasticity, chemical resistance, physical state, glass transition temperature, and mechanical properties are also summarized. Finally, some major polymer-based industries like plastics, rubber, fibers, and coatings are listed.
Elastomers, also known as rubbers, are polymers that are elastic and flexible. They have low Young's modulus and high failure strain compared to other materials. Elastomers exist above their glass transition temperature, allowing considerable segmental motion. Common elastomers include natural rubber and synthetic rubbers like polyisoprene, butadiene rubber, nitrile butadiene rubber, chloroprene rubber, thermoplastic elastomers, fluoroelastomers, and silicones. Elastomers are usually thermosets that require vulcanization, but can also be thermoplastics. They are characterized by large elastic elongation, the ability to stretch and return to their original shape, and flexibility.
Polymers are giant molecules composed of repeating structural units joined together. They can be classified based on their origin (natural, semi-synthetic, synthetic), thermal response (thermoplastic, thermosetting), structure (linear, branched, cross-linked), and application (rubber, plastic, fibers). Polymerization is the process of linking monomers together to form polymers. It occurs via two main mechanisms: step-growth polymerization (condensation polymerization) and chain-growth polymerization (addition polymerization). Step-growth involves the elimination of a small molecule as monomers react together in a step-wise manner, while chain-growth is a chain reaction with no byproducts as monomers continuously add to the
Plastics can be used as building materials due to their beneficial properties such as strength, durability, resistance to water and corrosion, and low cost. There are two main types of plastics - thermoplastics, which soften when heated and harden when cooled and can be repeatedly reformed, and thermosetting plastics, which permanently harden during heating and cannot be remelted or remolded. Common applications of plastics in construction include pipes, cables, flooring, roofing, windows, and structural plastic composites reinforced with fibers.
This presentation contains the synthesis, properties and applications of synthetic Resins like Phenol Formaldehyde,Urea Formaldehyde and Melamine formaldehyde.
Thermosetting plastics cannot be remelted or reshaped once formed because their molecules are strongly cross-linked in three dimensions. Examples include epoxy, polyurethane, melamine formaldehyde, and urea formaldehyde. In contrast, thermoplastics can be remelted and reshaped multiple times for recycling, but their quality degrades with each reshaping. Common uses of thermosetting plastics include glues, plastics, electrical insulators, and boat hulls.
POLYMERS : PLASTICS AND THERMOPLASTICSSahil Nagpal
This document provides an overview of plastics and rubber, including their history, key developments, types, properties, manufacturing processes, and recycling. Some of the main points covered include:
- The first man-made plastic was Parkesine created in 1862; major early developments included celluloid, Bakelite, and nylon.
- Thermoplastics can be remelted and remolded, while thermosets chemically decompose when heated.
- Plastics are lightweight, durable, versatile materials but take a long time to decompose without proper disposal and recycling.
This document discusses thermoplastic elastomers (TPEs). TPEs have both thermoplastic and elastomeric properties. They can be melt-processed like thermoplastics but are flexible and elastic like vulcanized rubbers. The most common TPE is a styrene-butadiene block copolymer, which has rigid polystyrene end blocks and soft polybutadiene mid blocks. This structure allows it to behave like a rubber at low temperatures but melt and flow like a thermoplastic at higher temperatures. Common applications of TPEs include automotive parts, medical devices, shoes, and cables due to advantages like recyclability and simpler processing compared to thermoset rubbers
This document discusses using Redux with Polymer frameworks. It notes that Polymer components are decentralized while data needs centralization, creating problems with asynchronous state changes. Redux is presented as a solution with its principles of single state source, read-only state, and pure function changes. It describes connecting Polymer and Redux through a binding library, dispatching actions, and using selectors to optimize data access. Best practices are outlined like splitting UI/data code, matching store shape to components, and resolving clashes between Polymer mutations and Redux immutability.
Melting point is influenced by molecular arrangement and crystal size and structure. Polyesters like PET, PPT, and PBT have different melting points depending on their chemical structure, with PET melting at 265°C. Nylon polymers have varying melting points based on their chain length, with nylon 6 melting at 230°C, nylon 10 estimated to melt between 185-210°C, and nylon 12 at 180°C. For polymers, melting temperature refers to the transition from crystalline solid phase to amorphous solid phase rather than a complete melt.
Web components: mais simples e produtivo com polymer!Andrew Willard
O documento discute Web Components e como eles podem tornar o desenvolvimento web mais simples e produtivo usando Polymer. Web Components permitem criar elementos reutilizáveis através de templates, shadow DOM e custom elements que podem ser usados em qualquer página da web. O Polymer fornece uma biblioteca e ferramentas para criar Web Components de forma fácil.
Extrusion is a process where a material is pushed through a die to create objects of a fixed cross-sectional profile. It can produce very complex cross-sections and work brittle materials since the material only experiences compressive and shear stresses. Hollow cavities inside the extruded material require a die that changes shape internally to support the suspended center pieces. The process involves heating stock material, loading it into a press, and using a ram to push it through the die to form the final extruded shape.
[Angularjs 도입 선택 가이드]
본 문서는 네이버 개발자 블로그 hello world 를 통해서 공개되었습니다.
[문서개요]
이 문서는 AngularJS를 사용한 애플리케이션 개발을 계획하고 있거나 AngularJS 도입을 고려 중일 때 참고 할 만한 내용을 기술한다. AngularJS를 사용하는 방법을 다루지는 않는다.
이 문서의 모든 내용은 AngularJS 버전 1.3.x를 기준으로 작성되었다.
All matter, no matter how complex, can be broken down into molecules which can be broken down further into atomic elements. All web interfaces can be broken down down the same way. Atomic Design provides a methodology for building an effective design system. It consists of five distint stages: atoms, molecules, organisms, templates and pages.
Polymer science concerns large molecules called polymers that include rubbers, plastics, and fibers. Polymers are made of repeating molecular units and have high molecular weights. There are over 60,000 scientists working with polymers today to develop new materials with customized properties. Common polymers include polypropylene, polyethylene, and nylons. Polymers can be categorized based on their molecular structure as thermoplastics, thermosets, or elastomers, which determine how they respond to heat.
Polymer can be classified in several ways:
1. By origin - natural polymers are isolated from nature, semi-synthetic are modified natural polymers, and synthetic are made entirely in a lab.
2. By structure - linear polymers have straight chains while cross-linked polymers have a 3D network structure.
3. By application - fibers have strength from hydrogen bonding and are crystalline, plastics are shaped by heat/pressure, and elastomers are rubbery and amorphous.
This document provides an overview of polymers, including:
- Polymers are large molecules made by linking repeating units called monomers. Naturally occurring polymers have been used for thousands of years, while artificial polymers were developed more recently after WWII.
- Polymers can be classified based on their source, thermal behavior, chemical structure, stereochemistry, and end use. Important types include thermoplastics, thermosets, homopolymers, copolymers, fibers, and plastics.
- Polymer properties depend on factors like strength, crystallinity, elasticity, and glass transition temperature which are influenced by the polymer structure. Common characterization techniques and molding processes like injection molding are also discussed.
Polymers are long-chain molecules composed of repeating structural units called monomers. They can be classified in several ways: by source (natural, synthetic, semi-synthetic), structure (linear, branched, cross-linked), polymerization type (addition, condensation), molecular forces (elastomers, thermoplastics, thermosets, fibers), and as biopolymers from living organisms. Polymers have a variety of uses depending on their properties and classifications.
This document provides an overview of biodegradable polymers. It defines biodegradable polymers as polymers with unstable links in the backbone that slowly disappear from the site of administration through chemical reactions like hydrolysis. The document classifies biodegradable polymers and discusses various synthetic and natural biodegradable polymers like polylactic acid and polyglycolic acid. It also outlines factors that affect the biodegradation of polymers and different mechanisms of biodegradation including bulk erosion, surface erosion, and enzymatic degradation.
Conductive polymers and plastics are increasingly desired for a growing numbe...Aman Agrawal
Conductive polymers and plastics are increasingly desired for various applications. Most plastics are naturally non-conductive and used as insulators, but polymers can be made conductive through modifications to increase their conductivity. This has led to plastics being formulated for four categories of increasing conductivity: insulating, dissipative, conductive, and highly conductive or shielding. Polymerization involves combining monomers into a covalently bonded chain, where some chemical groups may be lost from each monomer to form the repeating unit of the polymer.
This document discusses polymers, including their classification, characteristics, properties, strengths, and applications. It begins with an introduction to polymers being long chains of repeating monomer units. It then covers the main topics of types of polymers like polyethene and nylon, how they are classified based on composition and reaction, their characteristics like low density and good moldability. Properties depend on chain length and structure. Strength increases with longer chains and higher crystallinity. Finally, applications of polymers in areas like packaging, textiles, construction, medicine and pharmaceuticals are outlined.
This document summarizes various ways of classifying polymers. Polymers can be classified based on their structure as linear, branched, or cross-linked. They can also be classified based on their source as natural, semi-synthetic, or synthetic. Additionally, polymers are classified based on the number and arrangement of monomers, their configuration, the intermolecular forces between chains, and the type of polymerization reaction (addition or condensation). The document provides examples for most polymer classifications.
Polymers are long chains of repeating molecular units called monomers. There are several types of polymers including polyethene, polypropene, nylons, polyurethanes, and polyesters. Polymers are classified based on their structure and production method. Properties depend on factors like chain length and structure. Common applications include plastic containers, clothing, pipes, sports equipment, and medical devices.
Polymers are long chains of repeating molecular units called monomers. There are several types of polymers including polyethene, polypropene, nylons, polyurethanes, and polyesters. Polymers are classified based on their structure and production method. Properties depend on factors like chain length and structure. Common applications include plastic containers, clothing, pipes, sports equipment, and medical devices.
Introduction
Types of polymer
Classification of Polymer
Polymerization
Biodegradable Polymer
Application of biodegradable polymer
Natural polymer
They occur naturally and are found in plants and animals. For example, proteins, starch, cellulose, and rubber. To add up, we also have biodegradable polymers called biopolymers.
Semi-synthetic Polymers:
They are derived from naturally occurring polymers and undergo further chemical modification. For example, cellulose nitrate, and cellulose acetate.
Synthetic Polymers
These are man-made polymers. Plastic is the most common and widely used synthetic polymer. It is used in industries and various dairy products. For example, nylon-6, 6, polyether’s etc.
Thermosetting polymersThese polymers greatly improve the material’s mechanical properties. It provides enhanced chemical and heat resistance. For example, phenolics, epoxies, and silicones.Addition Polymerization: For Example, poly ethane, Teflon, Polyvinyl chloride (PVC)Condensation Polymerization: Example, Nylon -6, 6, perylene, polyesters.
Polymers are large molecules formed from repeated linking of smaller molecules called monomers. There are two main types of polymers: thermoplastics and thermosetting plastics. Thermoplastics can be softened on heating and hardened on cooling, allowing for reshaping. Thermosetting plastics form cross-linked bonds that prevent reshaping after the initial heating and molding. Common thermoplastics used in engineering include nylon, polycarbonate, polyethylene terephthalate, and polypropylene. Elastomers are polymers that can stretch over 100% and regain their original shape, such as natural and synthetic rubbers used in grips, shoe soles, and adhesives. Polymer properties can be modified by
1. The document discusses polymers, their types including plastics, elastomers, fibers, and composites.
2. Key polymerization reactions are addition polymerization which does not eliminate small molecules, and condensation polymerization which eliminates molecules like water.
3. Common polymers discussed include nylon, polyethylene, polyester, rubber and fibers like nylon-6,6 and terylene. Composites contain a matrix and dispersed strengthening phase.
This document provides an overview of polymers including their classification, characteristics, and applications. It discusses how polymers are large molecules formed from monomers linking together in chains. Polymers can be classified based on their source, structure, polymerization method, or molecular forces. They have properties like low density, moldability, and corrosion resistance. Important applications of polymers discussed are for oral, transdermal, and ocular drug delivery systems where they can control and sustain drug release through diffusion, degradation, or swelling mechanisms.
Polymers play a very important role in human life. Our body is made of lot of polymers, e.g. Proteins, enzymes, etc. Other naturally occurring polymers like wood, rubber, leather and silk are have wide application. Now a day synthetic polymer like useful plastics, rubbers and fiber materials are synthesized. presentation includes introduction classification and preparation methods. Polymers play a very important role in human life. Our body is made of lot of polymers, e.g. Proteins, enzymes, etc. Other naturally occurring polymers like wood, rubber, leather and silk are have wide application. Now a day synthetic polymer like useful plastics, rubbers and fiber materials are synthesized. Leo Baekeland patented the first totally synthetic polymer called Bakelite (1910). Bakelite is a versatile, durable material prepared from low-cost materials phenol and formaldehyde and was the most important synthetic polymer material. In the 1920s Hermann Staudinger showed that polymers were high-molecular-weight compounds held together by normal covalent bonds.
The suffix in polymer ‘mer’ is originated from Greek word meros – which means part. The word polymer is thus coined to mean material consisting of many parts or mers. A macromolecule having high molecular mass (103-107u) and generally not a well-defined structure or molecular weight. The macromolecules formed by joining of repeating structural units on a large scale. The repeating structural units are simple and reactive molecules linked to each other by covalent bonds. This process of formation of polymers from respective monomers is called polymerization. Most of the polymers are basically organic compounds, however they can be inorganic (e.g. silicones based on Si-O network).
Polymers are large molecules formed by combining many smaller subunits called monomers. They can be found naturally or made synthetically. Polymers are formed through polymerization reactions where monomers bond together into long chains or networks. There are several ways polymers can be classified, including by their source, structure, type of polymerization reaction, monomers used, intermolecular forces, backbone composition, and atomic arrangement. The functionality and degree of polymerization also provide information about polymers' structure and properties.
Macromolecules are large molecules formed by linking many smaller units, or monomers, through covalent bonds. Natural substances like proteins and synthetic polymers are examples of macromolecules. Monomers undergo polymerization to form macromolecules by linking together through addition or condensation reactions. Polymers can be classified in different ways such as natural vs synthetic, organic vs inorganic, thermoplastic vs thermosetting, and linear, branched or cross-linked based on their molecular structure. The process of polymerization and properties of polymers depend on factors like the type of monomers, reaction conditions and molecular architecture.
Plastic is a general term for synthetic polymers that can be molded into solid objects. The first plastic, Parkesine, was created in 1862 from cellulose. Plastics are made from polymers formed through addition, condensation, or addition polymerization reactions from raw materials like monomers, plasticizers, and fillers. The two main types are thermoplastics, which soften when heated and harden when cooled, and thermoset plastics, which harden permanently after heating. Common plastics include polyethylene, PVC, PVA, and bakelite. Plastics are used widely due to properties like light weight, corrosion resistance, strength, and insulation.
Presentation on Composite Materials
Rana zia ur rehman
Graduate Researcher at KAIST (Korea Advanced of Science & Technology)
My Email ID: ranazia517@gmail.com
DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODELgerogepatton
As digital technology becomes more deeply embedded in power systems, protecting the communication
networks of Smart Grids (SG) has emerged as a critical concern. Distributed Network Protocol 3 (DNP3)
represents a multi-tiered application layer protocol extensively utilized in Supervisory Control and Data
Acquisition (SCADA)-based smart grids to facilitate real-time data gathering and control functionalities.
Robust Intrusion Detection Systems (IDS) are necessary for early threat detection and mitigation because
of the interconnection of these networks, which makes them vulnerable to a variety of cyberattacks. To
solve this issue, this paper develops a hybrid Deep Learning (DL) model specifically designed for intrusion
detection in smart grids. The proposed approach is a combination of the Convolutional Neural Network
(CNN) and the Long-Short-Term Memory algorithms (LSTM). We employed a recent intrusion detection
dataset (DNP3), which focuses on unauthorized commands and Denial of Service (DoS) cyberattacks, to
train and test our model. The results of our experiments show that our CNN-LSTM method is much better
at finding smart grid intrusions than other deep learning algorithms used for classification. In addition,
our proposed approach improves accuracy, precision, recall, and F1 score, achieving a high detection
accuracy rate of 99.50%.
Comparative analysis between traditional aquaponics and reconstructed aquapon...bijceesjournal
The aquaponic system of planting is a method that does not require soil usage. It is a method that only needs water, fish, lava rocks (a substitute for soil), and plants. Aquaponic systems are sustainable and environmentally friendly. Its use not only helps to plant in small spaces but also helps reduce artificial chemical use and minimizes excess water use, as aquaponics consumes 90% less water than soil-based gardening. The study applied a descriptive and experimental design to assess and compare conventional and reconstructed aquaponic methods for reproducing tomatoes. The researchers created an observation checklist to determine the significant factors of the study. The study aims to determine the significant difference between traditional aquaponics and reconstructed aquaponics systems propagating tomatoes in terms of height, weight, girth, and number of fruits. The reconstructed aquaponics system’s higher growth yield results in a much more nourished crop than the traditional aquaponics system. It is superior in its number of fruits, height, weight, and girth measurement. Moreover, the reconstructed aquaponics system is proven to eliminate all the hindrances present in the traditional aquaponics system, which are overcrowding of fish, algae growth, pest problems, contaminated water, and dead fish.
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...IJECEIAES
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
Batteries -Introduction – Types of Batteries – discharging and charging of battery - characteristics of battery –battery rating- various tests on battery- – Primary battery: silver button cell- Secondary battery :Ni-Cd battery-modern battery: lithium ion battery-maintenance of batteries-choices of batteries for electric vehicle applications.
Fuel Cells: Introduction- importance and classification of fuel cells - description, principle, components, applications of fuel cells: H2-O2 fuel cell, alkaline fuel cell, molten carbonate fuel cell and direct methanol fuel cells.
ACEP Magazine edition 4th launched on 05.06.2024Rahul
This document provides information about the third edition of the magazine "Sthapatya" published by the Association of Civil Engineers (Practicing) Aurangabad. It includes messages from current and past presidents of ACEP, memories and photos from past ACEP events, information on life time achievement awards given by ACEP, and a technical article on concrete maintenance, repairs and strengthening. The document highlights activities of ACEP and provides a technical educational article for members.
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECTjpsjournal1
The rivalry between prominent international actors for dominance over Central Asia's hydrocarbon
reserves and the ancient silk trade route, along with China's diplomatic endeavours in the area, has been
referred to as the "New Great Game." This research centres on the power struggle, considering
geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
in Central Asia. This study adheres to the empirical epistemological method and has taken care of
objectivity. This study analyze primary and secondary research documents critically to elaborate role of
china’s geo economic outreach in central Asian countries and its future prospect. China is thriving in trade,
pipeline politics, and winning states, according to this study, thanks to important instruments like the
Shanghai Cooperation Organisation and the Belt and Road Economic Initiative. According to this study,
China is seeing significant success in commerce, pipeline politics, and gaining influence on other
governments. This success may be attributed to the effective utilisation of key tools such as the Shanghai
Cooperation Organisation and the Belt and Road Economic Initiative.
4. The word polymer is derived from the Greek words
poly- meaning "many"; and meros meaning "part".
The term was coined in 1833 by Jöns Jacob
Berzelius.
5. A polymer is a large molecule (macromolecule)
composed of repeating structural units. These
subunits are typically connected by covalent
chemical bonds
6. Starting in 1811, Henri Braconnot did pioneering
work in derivative cellulose compounds, perhaps
the earliest important work in polymer science.
7.
8.
9. A chemical reaction in which simple molecules
(monomers) are added to each other to form
long-chain molecules (polymers) without by-
products.
10. The monomers that are involved in condensation
polymerization are not the same as those in
addition polymerization.
11. . In living cells, they may be synthesized by
enzyme-mediated processes, such as the
formation of DNA catalyzed by DNA polymerase.
12. Many commercially important polymers are
synthesized by chemical modification of
naturally occurring polymers.
13.
14. The tensile strength of a material quantifies how much stress
the material will endure before suffering permanent
deformation.[
This is very important in applications that rely
upon a polymer's physical strength or durability. For example,
a rubber band with a higher tensile strength will hold a greater
weight before snapping. In general, tensile strength increases
with polymer chain length and crosslinking of polymer chains
15. The toughness is a measure of the energy a sample
can absorb before it breaks.
16. Young's Modulus quantifies the elasticity of the
polymer. It is defined, for small strains, as the ratio
of rate of change of stress to strain. Like tensile
strength, this is highly relevant in polymer
applications involving the physical properties of
polymers, such as rubber bands.
17. The physical state and morphology of a polymer have a strong
influence on its mechanical properties. A simple measure of the
differences produced in mechanical behaviour is the elongation
that occurs when a plastic is loaded (stressed) in tension.
18. The term melting point, when applied to polymers, suggests
not a solid-liquid phase transition but a transition from a
crystalline or semi-crystalline phase to a solid amorphous
phase.
19. THERMOSET POLYMERS BECOME HARD AND EVENTUALLY
BURN ON HEATING THEY ARE NOT RECYCLEABLE
THERMOPLASTIC POLYMERS ARE SOFTEN AND MELTED ON
HEATING
21. POLYMERS THAT CONTAINS SINGLE TYPE OF
REPEATED UNIT ARE CALLED HOMOPOLYMERS
POLYMERS WHICH ARE MADE OF DIFFERENT
TYPES OF MONOMERS ARE CALLED
COPOLYMERS
22. IT IS THE AVERAGE NO OF MERS IN A POLYMER.GREATER
THE DEGREE GREATER WILL BE THE MOLECULAR WEIGHT
23. Polymers are not crystalline in nature but to
some extant crystallinity can be induced in it by
different means
24. The physical properties of a polymer are strongly dependent on the
size or length of the polymer chain. For example, as chain length is
increased, melting and boiling temperatures increase quickly .Impact
resistance also tends to increase with chain length.
25. Polymer degradation is a change in the properties—
tensile strength, color, shape, molecular weight, etc due
to environmental factors, such as heat, light, chemicals
etc. It is often due to the scission of polymer chain
bonds
26.
27.
28.
29.
30. Rubber is the most important of all elastomers.
Natural rubber is a polymer whose repeating unit is
isoprene. This material, obtained from the bark of the
rubber tree, has been used by humans for many
centuries
31. The two main types of plastics are thermoplastics and thermosets.
Thermoplastics soften on heating and harden on cooling while
thermosets, on heating, flow and cross-link to form rigid material
which does not soften on future heating. Thermoplastics account
for the majority of commercial usage e.g polyethylene
32. Natural fibers such as cotton, wool, and silk have been
used by humans for many centuries. In 1885, artificial silk
was patented and launched the modern fiber industry.
Man-made fibers include materials such as nylon,
polyester, rayon, and acrylic.