Short Description related to the rubber filler properties and Rubber filler types ( Reinforcing fillers, Semi- reinforcing fillers and Non-reinforcing fillers). e.g.:- Carbon Black, Silica, Calcium Carbonate, Clay and Miscellaneous Fillers
The objective of this presentation is to give an overview of rubber compounding. We will briefly focus on:
Elastomer System
Filler System
Protection system
Process Aids
Cure System
Short Description related to the rubber filler properties and Rubber filler types ( Reinforcing fillers, Semi- reinforcing fillers and Non-reinforcing fillers). e.g.:- Carbon Black, Silica, Calcium Carbonate, Clay and Miscellaneous Fillers
The objective of this presentation is to give an overview of rubber compounding. We will briefly focus on:
Elastomer System
Filler System
Protection system
Process Aids
Cure System
The presentation describes about the butyl rubber about its properties, compounding, categories, applications, new innovations, advantages and disadvantages. The references are added at the end
Lecture: Polymerization Reactions and TechniquesNikolai Priezjev
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.
Introduction to waterborne paints & coatings rheologyspecialchem-ada
To get additional information, you can use the following link: goo.gl/dxR59V
In this presentation, the technical expert explains how Rheology influences in-can properties, paint texture, application properties & film properties.
You will find some product recommendations: the right dispersants and thickeners (Acrylic, HEUR) to be used in various formulation types to improve coating properties.
If you would like to get more detailed information on Rheology, click on the following link: goo.gl/dxR59V
Learn about the nine primary physical properties of a rubber compound: hardness, tensile strength, modulus, elongation, tear resistance, abrasion resistance, compression set resistance, resilience and specific gravity. This presentations offers detailed information on each property, why it is important and how it is measured.
Introduction, types, raw material, reaction mechanism, manufacturing process, flow sheet of production process, properties, applications, industries in India, commercial name
The presentation describes about the butyl rubber about its properties, compounding, categories, applications, new innovations, advantages and disadvantages. The references are added at the end
Lecture: Polymerization Reactions and TechniquesNikolai Priezjev
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.
Introduction to waterborne paints & coatings rheologyspecialchem-ada
To get additional information, you can use the following link: goo.gl/dxR59V
In this presentation, the technical expert explains how Rheology influences in-can properties, paint texture, application properties & film properties.
You will find some product recommendations: the right dispersants and thickeners (Acrylic, HEUR) to be used in various formulation types to improve coating properties.
If you would like to get more detailed information on Rheology, click on the following link: goo.gl/dxR59V
Learn about the nine primary physical properties of a rubber compound: hardness, tensile strength, modulus, elongation, tear resistance, abrasion resistance, compression set resistance, resilience and specific gravity. This presentations offers detailed information on each property, why it is important and how it is measured.
Introduction, types, raw material, reaction mechanism, manufacturing process, flow sheet of production process, properties, applications, industries in India, commercial name
This test method gives an indication of the oxidation resistance of raw natural rubber at a specified temperature. This resistance is indicated by the Plasticity Retention Index (PRI), a ratio expressed as a percentage of the aged plasticity to the original plasticity determined by means of a parallel plate plasto meter. A low PRI value indicates a poor resistance to oxidation.
Manufacturers of Hydraulic Presses 5 to 500 Ton, Auto Hydraulic Bale Cutting Machine, Auto Blank Cutting Machine, Single & Double Acting Cylinders, Hydraulic Power Packs, Fully Automatic Electrical Control Panel with PLC, Tyre, Tube & Other Moulds, Special Purpose Machines & Other Engineering Fabrications.
Rubber Processing and Profiting: Compounding, Mixing, Vulcanization, Extrusio...Ajjay Kumar Gupta
Methods for processing rubber include mastication and various operations like mixing, calendering, extrusion, all processes being essential to bring crude rubber into a state suitable for shaping the final product. The former breaks down the polymer chains, and lowers their molecular mass so that viscosity is low enough for further processing. After this has been achieved, various additions can be made to the material ready for cross-linking. Rubber may be masticated on a two-roll mill or in an industrial mixer, which come in different types.
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Oils and their relationship to refrigeration systems -RETA conference 2015Manuel Muñoz Alonso
These are the slides of the technical paper presented in the RETA Conference 2015 (www.reta.com), used during my lecture. A good review of the latest lubricant technology available for natural refrigerants.
Estas son las transparencias utilizadas en el Congreso anual de RETA (www.reta.com) durante mi presentación. Un buen resumen de las úlitimas tenologías de lubricantes disponibles para los refrigerantes naturales.
Enhancement in viscosity of diesel by adding vegetable oilIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
Synthesis, Characterization and Performance Evaluation of Poly Octadecyl Meth...IOSRJAC
Methacrylate polymers are widely used as additives in lubricating oils, as pour point depressants and viscosity index improvers. In this study, homopolymer of Octadecyl methacrylate and Octadecyl methacrylate_co_methylmethacrylate with molar ratios of 30:70, 50:50 and 70:30 were synthesized and characterized. The free radical polymerization was carried out at 70 °C in toluene solvent and 2, 2′- azobisisobutyronitrile (AIBN) as initiator. All products were characterized by FTIR, 1H-NMR and gel permeation chromatography (GPC). The obtained results showed the efficacy of the additives as viscosity index improvers, pour point depressants. The pour points of most base oils containing each polymer decreased compared to that of the pure base oil. 70% octadecyl methacrylate units showed a 15Cᵒ reduction in their pour points, thus establishing the large efficiency of the products synthesized in this work. The efficiencies of the prepared compounds as viscosity index improvers were investigated. It was found that the efficiency of the prepared compound as viscosity index improvers increases with increasing the concentration of additives.
Comparative Analysis on Sodium-Based and Polyethylene-Based Greases as Anti-F...theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Synthesis, Characterization of Modified Guar Gum Copolymers through Graft Cop...ijtsrd
The graft copolymerization of acrylic acid AA initiated by potassium persulfate PPS progresses through free radical initiation mechanism carried out onto purified guar gum backbone and acrylamide AM which has been synthesized by grafting polyacrylamide chains onto carboxymethyl guar gum CMG backbone using conventional redox grafting. The graft copolymers were characterized using FT IR spectroscopy, elemental analysis, thermal analysis, scanning electron microscopy and rheologically. Reverse demulsification performance of the graft copolymers were evaluated using crude oil in water emulsion sample by a modified jar test method. It showed that graft copolymers based on acrylamide were better reverse demulsifiers than those based on acrylic acid. Among acrylamide synthetic graft copolymers CMG g AM CGA1 diluted to about 1 in a dose of 50ppm performed best when compared with the other synthetic graft copolymers of acrylamide with a reverse demulsification efficiency of 64.7 , while the best reverse demulsification efficiency for graft copolymers of acrylic acid GG g AA GGA2 diluted to about 1 in a dose of 50ppm is 59.2 , both products didn’t outperformed the Industrial Reverse Demulsifier IRD . Ayman Abu Reid | Yousif. A. Ragab | Salih. MAA | Imad. E. A. Mahajoub "Synthesis, Characterization of Modified Guar Gum Copolymers through Graft Copolymerization using Acrylamide and Acrylic Acid and its Effect in Treatment of Crude Oil Emulsified Water" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-5 , August 2022, URL: https://www.ijtsrd.com/papers/ijtsrd50661.pdf Paper URL: https://www.ijtsrd.com/chemistry/polymer-chemistry/50661/synthesis-characterization-of-modified-guar-gum-copolymers-through-graft-copolymerization-using-acrylamide-and-acrylic-acid-and-its-effect-in-treatment-of-crude-oil-emulsified-water/ayman-abu-reid
Presentation delivered by Todd Vargason of Ergon Asphalt & Emulsions on "Asphalt Emulsion Basics." Presentation delivered at the California Asphalt Pavement Association (CalAPA) Spring Asphalt Pavement Conference April 25-26, 2018 in Ontario, CA.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
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Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
1. L.D. College of Engineering
Rubber Technology
B.E. Semester 6th
Compounding & Processing
Techniques of SBR & ACM
Group:- 4
Ravi Bhikadiya (140280126001)
Akshay Kavar (140280126007)
Nilesh Patel (140280126014)
Dhruvik Pipaliya (140280126017)
Ravi Sardhara (140280126022)
Chirag Zalavadiya (140280126029)
Rahul Kumar Rathva (130280126023)
2. SBR (Styrene Butadiene Rubber)
Styrene-butadiene rubber (SBR), a general-
purpose synthetic rubber, produced from a copolymer
of styrene and butadiene. Exceeding all other synthetic rubbers
in consumption, SBR is used in great quantities in automobile
and truck tires, generally as an abrasion-resistant replacement
for natural rubber (produced from polyisoprene).
Properties
Properties E-SBR S-SBR
Tensile strength 20 18
Elongation 635 565
Mooney Viscocity 51.6 48
Tg -50 -65
3. Compounding of SBR
SBR is a mixture of approximately 75 percent butadiene
(CH2=CH-CH=CH2) and 25 percent styrene (CH2=CHC6H5). In
most cases these two compounds are copolymerized (their
single-unit molecules linked to form long, multiple-unit
molecules) in an emulsion process, in which a soap like surface-
acting agent disperses, or emulsifies, the materials in a
water solution. Other materials in the solution include free-
radical initiators, which begin the polymerization process, and
stabilizers, which prevent deterioration of the final product.
Upon polymerization, the styrene and butadiene repeating units
are arranged in a random manner along the polymer chain.
The polymer chains are crosslinked in the vulcanization process.
For many purposes SBR directly replaces natural
rubber, the choice depending simply on economics. Its particular
advantages include excellent abrasion resistance, crack
resistance, and generally better aging characteristics.
Components Parts by weight
Styrene 25
Butadiene 75
Water 180
Fatty Acid soap 5
Mercaptan 0.5
Potassium persulphate 0.3
4. SBR Processing
1. Emulsion Polymerization Process
2. Solution Polymerization Process
Emulsion polymerization
E-SBR produced by emulsion polymerization is initiated by free
radicals. Reaction vessels are typically charged with the two
monomers, a free radical generator, and a chain transfer agent
such as an alkyl mercaptain. Radical initiators include potassium
persulfate and hydro peroxides in combination with ferrous
salts. Emulsifying agents include various soaps. By growing
organic radicals, mercaptans (e.g. dodecylthiol), control the
molecular weight, and hence the viscosity, of the product.
Typically, polymerizations are allowed to proceed only to ca.
70%, a method called "short stopping". In this way, various
additives can be removed from the polymer.
Solution polymerization
Solution-SBR is produced by an anionic polymerization process.
Polymerization is initiated by alkyl lithium compounds. Water is
strictly excluded. The process is homogeneous (all components
are dissolved), which provides greater control over the process,
allowing tailoring of the polymer. The compound adds to one of
the monomers, generating a carbanion that then adds to another
monomer, and so on. Relative to E-SBR, S-SBR is increasingly
favored because it offers improved wet grip and rolling
resistance, which translate to greater safety and better fuel
economy, respectively.
5. ACM (Poly Acrylic Rubber)
Poly acrylate Compositions
(Compounding)
Polyacrylate elastomers are polymers of acrylic acid
esters with added reactive curesite monomers. Polyacrylate
backbone monomers are responsible for the overall balance of
physical properties and chemical resistance of ACM polymer.
Backbone monomers account for 95–99% of the weight of a
normal polyacrylate elastomer. These may consist of one or
more different types of acrylic monomers. Typical backbone
monomers are ethyl acrylate (EA), n-butyl acrylate (BA), and 2-
methoxyethyl acrylate (MEA).
6. Ethyl acrylate based polymers have excellent high
temperature and aromatic oil resistance. However, the low-
temperature limit, expressed as the glass transition (Tg)
temperature, is -18C. Polymers based on EA are used in
applications requiring maximum oil resistance. Addition of n-
butyl acrylate to an ethyl acrylate based polymer lowers the Tg
of the polymer. The Tg of a butyl acrylate based polymer is -55
°C. While polymers containing BA have excellent heat
resistance, increasing the content of BA decreases the oil
resistance. A typical compound based on an EA/BA copolymer
with a -40 °C (Tg) would exhibit a typical volume swell of
about +60% when aged in IRM 903 oil while an EA
homopolymer would only increase 11% in volume. The addition
of MEA to an EA or BA containing polymer improves the
balance of oil resistance and low temperature. However, it has a
negative effect on the heat resistance of the polymer. Available
commercial grades of polyacrylate elastomers cover a wide
range of temperature and oil resistance. Each grade is a
compromise of heat resistance, low-temperature performance,
and oil swell resistance.
7. Basic Recipe of Compounding
Polyacrylates generally offer a lower-cost solution
versus the other oil-resistant, high-temperature types such as
FVMQ (fluorinated silicone) and FKM (fluorinated
hydrocarbon) elastomers. Polyacrylates also offer improved
high-temperature resistance over HNBR (hydrogenated nitrile)
and ECO/CO (epichlorohydrin ethylene oxide) elastomers.
Improved oil resistance is their major advantage over the AEM
(acrylic/ethylene) and MQ/VMQ (silicone/vinyl functional
silicone) materials.
A typical polyacrylate recipe and physical
properties are shown in Figure 3 and Figure 4, respectively.
Suitably compounded and cured, polyacrylates offer the
following general resistance:
Temperatures from -40 to 200°C depending on type
Petroleum-based oils/greases at elevated temperatures, including
sulfur bearing types Ozone and ultraviolet (UV) light at normal
and elevated temperatures Aliphatic solvents On the other hand,
typical grades are not resistant to steam and hot water, gasoline
(except for certain grades), and alcohols/glycols.
Applications
It is commonly used in automotive transmissions and hoses.
It is also used in shaft seals, adhesives, beltings, gaskets and O-
rings.
It is used in vibration damping mounts due to the damping
properties.
8. ACM Processing
A polymerization process in aqueous emulsion for the
preparation of a member selected from the group consisting
of rubber and acrylic elastomers, said elastomers having a
polymeric chain, characterized by the fact that said
polymerization is carried out through a continuous,
uniformly fed in a pre-mixture of the monomers with a
chain transfer agent is previously prepared in a separate
vessel and then, mixture is added drop by drop at a uniform
rate into the reaction vessel.
the mixture of the monomers with the chain transfer agent
may be prepared in the optional presence of oxygen.
The emulsion polymerization process of claim comprising:
a) purging of the reactor with nitrogen gas so as to
completely eliminate oxygen from the reaction system;
b) adding a pre-heated emulsifier into the reaction vessel at
around 65° C. to 70° C.;
c) adding a previously prepared solution of a free-radical
initiator into the reaction vessel;
d) feeding of said pre-mixture of said monomers and said
chain transfer agent, drop by drop, at a continuous and
uniform rate into the reaction vessel, until all of the mixture
has reacted, yielding a latex;
e) transferring said latex to a coagulation vessel;
f) adding a metal salt into the coagulation vessel, in
sufficient quantities so as to trigger coagulation of said
latex; and
g) washing and drying of the resultant rubber or acrylic
elastomer.