Polyethylene is the most common plastic. Its global production is ca. 80 million tones.
Chemical Formula: (C2H4)nH2
http://apps.kemi.se/flodessok/floden/kemamne_eng/polyeten_eng.htm
http://en.wikipedia.org/wiki/Polyethylene
http://www.answers.com/Q/What_are_advantages_and_disadvantages_of_polythene
Melamine resin or melamine formaldehyde is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. The presentation includes the preparation of MF, its properties and applications.
Polyethylene is the most common plastic. Its global production is ca. 80 million tones.
Chemical Formula: (C2H4)nH2
http://apps.kemi.se/flodessok/floden/kemamne_eng/polyeten_eng.htm
http://en.wikipedia.org/wiki/Polyethylene
http://www.answers.com/Q/What_are_advantages_and_disadvantages_of_polythene
Melamine resin or melamine formaldehyde is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. The presentation includes the preparation of MF, its properties and applications.
Introduction, types, raw material, reaction mechanism, manufacturing process, flow sheet of production process, properties, applications, industries in India, commercial name
poly styrene is a synthetic aromatic polymer made from the monomer styrene. Polystyrene can be solid or foamed. General purpose polystyrene is clear, hard, and rather brittle. It is an inexpensive resin per unit weight. polystyrene is in a solid (glassy) state at room temperature but flows if heated above about 100 °C, its glass transition temperature. It becomes rigid again when cooled .
Plastics has been evolving now a days. Our lives has been filled with plastics. Almost all of our things are made of plastics but do you what it is and what it is made of?
One of the most common and widely used plastic is polyethylene or PE with the resin codes 2 and 4. It is mostly used as plastic bags, food wraps, bulletproof vest, pipes and so many more. Here is a little preview of polyethylene and what is its purpose in our daily lives.
What is polyethylene?
Its properties, structure and applications.
Lecture notes on Structure and Properties of Engineering Polymers
Course Objectives:
The main objective is to introduce polymers as an engineering material and emphasize the basic concepts of their nature, production and properties. Polymers are introduced at three levels; namely, the molecular level, the micro level, and macro-level. Through knowledge of all three levels, student can understand and predict the properties of various polymers and their performance in different products. The course also aims at introducing the students to the principles of polymer processing techniques and considerations of design using engineering polymers.
Jute, an eco-friendly and affordable fiber grown profusely in India, possess unique combination of properties suited for the manufacture of non-textile products. However, its contribution for technical applications is limited at present. In this research, an effort has been made to investigate the physical and morphological properties of jute fiber when incorporated in epoxy matrix with a view to widen the share of jute fibers for engineered applications. Composite specimens containing nonwoven jute mat and alkali treated short jute fibers with different weight percentages (1, 2 wt%) were made using epoxy resin. The water absorption, thickness swelling (TS) and morphology [scanning electron microscopy (SEM)] tests of the bio composites were performed. As the fiber fraction ratio was increased the values for water absorption (WA) and thickness swell (TS) were found to be increased. The samples reinforced with 2 wt. percent fiber fractions showed maximum WA and TS in both water environments.
Introduction, types, raw material, reaction mechanism, manufacturing process, flow sheet of production process, properties, applications, industries in India, commercial name
poly styrene is a synthetic aromatic polymer made from the monomer styrene. Polystyrene can be solid or foamed. General purpose polystyrene is clear, hard, and rather brittle. It is an inexpensive resin per unit weight. polystyrene is in a solid (glassy) state at room temperature but flows if heated above about 100 °C, its glass transition temperature. It becomes rigid again when cooled .
Plastics has been evolving now a days. Our lives has been filled with plastics. Almost all of our things are made of plastics but do you what it is and what it is made of?
One of the most common and widely used plastic is polyethylene or PE with the resin codes 2 and 4. It is mostly used as plastic bags, food wraps, bulletproof vest, pipes and so many more. Here is a little preview of polyethylene and what is its purpose in our daily lives.
What is polyethylene?
Its properties, structure and applications.
Lecture notes on Structure and Properties of Engineering Polymers
Course Objectives:
The main objective is to introduce polymers as an engineering material and emphasize the basic concepts of their nature, production and properties. Polymers are introduced at three levels; namely, the molecular level, the micro level, and macro-level. Through knowledge of all three levels, student can understand and predict the properties of various polymers and their performance in different products. The course also aims at introducing the students to the principles of polymer processing techniques and considerations of design using engineering polymers.
Jute, an eco-friendly and affordable fiber grown profusely in India, possess unique combination of properties suited for the manufacture of non-textile products. However, its contribution for technical applications is limited at present. In this research, an effort has been made to investigate the physical and morphological properties of jute fiber when incorporated in epoxy matrix with a view to widen the share of jute fibers for engineered applications. Composite specimens containing nonwoven jute mat and alkali treated short jute fibers with different weight percentages (1, 2 wt%) were made using epoxy resin. The water absorption, thickness swelling (TS) and morphology [scanning electron microscopy (SEM)] tests of the bio composites were performed. As the fiber fraction ratio was increased the values for water absorption (WA) and thickness swell (TS) were found to be increased. The samples reinforced with 2 wt. percent fiber fractions showed maximum WA and TS in both water environments.
what are thermoplastic adhesives, types, properties, uses, its explanation with examples, use in the construction industry, applications, includes a market survey.
Premium Thermoplastic Composite Materials: An Industrial Break ThroughEcomass Technologies
With the technological advancement, the properties required for conventional materials have undergone changes. Leading it to the appearance of materials capable of meeting the intended requirements of new technologies.
Started to create milestones, we S. M. Adhesives marked our presence in the year 1998 and operates in the manufacturing/servicing of Inorganic Concrete Penetrant And Water Repellent, Expansion Joint Water Proofing System, SMAC EPOTAR HB (Coal Tar Epoxy Coating), Ecofriendly Exterior Paint, Drain Outlets Water Proofing System since 13 years. Our quality services/products have always won us many appreciations from our clients. Our spontaneous performance and confident approach in offering the excellent range of Inorganic Concrete Penetrant And Water Repellent, Expansion Joint Water Proofing System, SMAC EPOTAR HB (Coal Tar Epoxy Coating), Ecofriendly Exterior Paint, Drain Outlets Water Proofing System, Anti Corrosive Coating that has made us to deepen our roots in the market. We S. M. Adhesives breathe with the aim to satisfy our clients with our smart products/services. We are a unit of highly experienced professionals who all contribute best of their potentials to offer high efficiency.
2. Thermosets Cross-linked in a 3d network. Strength of bond. Hardness & strength in material not affected by temperature. Polymerization will require heat & pressure so that the shape of the part is permanently set.(curing) Irreversible. Decomposes. Chars.
3. Thermosets Tg not sharply defined. Become rubbery over a narrow range. Polymerization in 2 steps. At chemical plant & at parts-producing plant. Phenolics. Pots & pans. Possess better insulating, mechanical & chemical properties. Also better dimensional stability.
6. Melamine/Aminos Formica is a brand of composite materials which are heat-resistant, wipe-clean, plastic laminate with melamine resin. If exposed to enough heat, melamine will decompose. For this reason, melamine dishware should not be exposed to high temperatures like those in the oven and microwave.
8. Melamine Uses for melamine include floor tiles, kitchenware, fire retardant fabrics, and commercial filters. Melamine is an organic compound that is often combined with formaldehyde to produce melamine, a synthetic polymer which is fire resistant and heat tolerant. melamine releases water.
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10. Copolymer A heteropolymer or copolymer is a polymer derived from two (or more) monomeric species, as opposed to a homopolymer where only one monomer is used
11. Epoxies Excellent mechanical & electrical properties. Good dimensional stability & excellent adhesive properties. Application requiring mechanical strength & thermal insulation. Used as coatings & adhesives.
12. Epoxies have low shrinkage, good chemical resistance, excellent adhesive properties. Downsides are the higher cost, a need for an accurate resin/hardener ratio (epoxies use a hardener not a catalyst, and the ratio will vary) when mixing and the need for skin protection.
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14. Disadvantages Strongly exothermic, this can lead to cracking. Contracts on curing (up to 8%). Protective measures must be taken before mixing and using any of the thermosetting resins. High temperature & pressure required UV-sensitive
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16. Designing With Thermosets there are potential pitfalls which can lead to designs difficult to produce, or costly failures in the field. The first important consideration is stiffness. far more rigid and dimensionally stable than thermoplastic.
17. Designing With Thermosets For applications requiring precise dimensional tolerances and low deformation under load, thermosets are an excellent choice. another important design criterion is associated with cross section thickness. Impact strength is another area requiring special attention. Applications which require flat surfaces may best be molded from a thermoset.
18. Thermosets As A Replacement For Metal Because of their dimensional stability, high strength, and thermal resistance, thermosets are often chosen as an alternative to metals. Potential benefits include cost saving, weight reduction, and improved chemical and corrosion resistance.
