Download or read book Hydrogenation of Unsaturated Polymers in Latex Form electronic Resource written by Lin, Xingwang and published by University of Waterloo. This book was released on 2005 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diimide generated from the hydrazine/hydrogen peroxide/catalyst system can be used to hydrogenate unsaturated polymers in latex form. As an economical and environmentally benign alternative to the commercial processes based on hydrogen/transition metal catalysts, this method is of special interest to industry. This thesis provides a detailed description of the diimide hydrogenation process. Reaction kinetics, catalysts and gel formation mechanism have been investigated. Four main reactions and a mass transfer process form three parallel processes in this system: diimide is generated at the interface of the latex particles; diimide diffuses into the organic phase to saturate carbon-carbon double bonds; diimide may be consumed at the interface by hydrogen peroxide, and may also be consumed by the disproportionation reaction in the organic phase. The two side reactions contribute to the low hydrogenation efficiency of hydrogen peroxide. Slowing down hydrogen peroxide addition and using stable interfacial catalysts may totally suppress the side reaction in the aqueous phase. The actual catalytic activity of metal ions in the latex depends on the hydrogen peroxide concentration and the addition procedure of reactants. Cupric ion provides better selectivity for hydrogenation than ferric ion and silver ion do. Boric acid as a promoter provides improved selectivity for hydrogenation and faster diimide generation rate. The side reaction in the rubber phase results in low efficiency and gel formation. The rate constants of the four reactions in this system are estimated. It is shown that the hydrogenation of nitrile rubber latex with an average particle diameter of 72 nm is mainly a reaction-controlled process. Diimide diffusion presents limitation upon hydrogenation at high hydrogenation degree range. Antioxidants can not effectively inhibit gel formation during hydrogenation. Hydrogenation of a core-shell latex with NBR as the shell layer should be able to achieve a higher efficiency, a higher degree of hydrogenation and a lower level of crosslinking.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polymer Chemistry written by Timothy P. Lodge and published by CRC Press. This book was released on 2020-07-14 with total page 609 pages. Available in PDF, EPUB and Kindle. Book excerpt: A well-rounded and articulate examination of polymer properties at the molecular level, Polymer Chemistry focuses on fundamental principles based on underlying chemical structures, polymer synthesis, characterization, and properties. It emphasizes the logical progression of concepts and provide mathematical tools as needed as well as fully derived problems for advanced calculations. The much-anticipated Third Edition expands and reorganizes material to better develop polymer chemistry concepts and update the remaining chapters. New examples and problems are also featured throughout. This revised edition: Integrates concepts from physics, biology, materials science, chemical engineering, and statistics as needed. Contains mathematical tools and step-by-step derivations for example problems Incorporates new theories and experiments using the latest tools and instrumentation and topics that appear prominently in current polymer science journals. The number of homework problems has been greatly increased, to over 350 in all. The worked examples and figures have been augmented. More examples of relevant synthetic chemistry have been introduced into Chapter 2 ("Step-Growth Polymers"). More details about atom-transfer radical polymerization and reversible addition/fragmentation chain-transfer polymerization have been added to Chapter 4 ("Controlled Polymerization"). Chapter 7 (renamed "Thermodynamics of Polymer Mixtures") now features a separate section on thermodynamics of polymer blends. Chapter 8 (still called "Light Scattering by Polymer Solutions") has been supplemented with an extensive introduction to small-angle neutron scattering. Polymer Chemistry, Third Edition offers a logical presentation of topics that can be scaled to meet the needs of introductory as well as more advanced courses in chemistry, materials science, polymer science, and chemical engineering.

Download or read book Chemistry Manufacture and Applications of Natural Rubber written by Shinzo Kohjiya and published by Woodhead Publishing. This book was released on 2021-03-24 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemistry, Manufacture and Applications of Natural Rubber, Second Edition presents the latest advances in the processing, properties and advanced applications of natural rubber (NR), drawing on state-of-the-art research in the field. Chapters cover manufacturing, processing and properties of natural rubber, describing biosynthesis, vulcanization for improved performance, strain-induced crystallization, self-reinforcement, rheology and mechanochemistry for processing, computer simulation of properties, scattering techniques and stabilizing agents. Applications covered include natural rubber, carbon allotropes, eco-friendly soft bio-composites using NR matrices and marine products, the use of NR for high functionality such as shape memory, NR for the tire industry, and natural rubber latex with advanced applications. This is an essential resource for academic researchers, scientists and (post)graduate students in rubber science, polymer science, materials science and engineering, and chemistry. In industry, this book enables professionals, R&D, and producers across the natural rubber, tire, rubber and elastomer industries, as well as across industries looking to use natural rubber products, to understand and utilize natural rubber for cutting-edge applications. Explains the latest manufacture and processing techniques for natural rubber (NR) with enhanced properties Explores novel applications of natural rubber across a range of industries, including current and potential uses Discusses resources and utilization, and considers sustainable future development of natural rubber

Download or read book Encyclopedic Dictionary of Polymers written by Jan W. Gooch and published by Springer Science & Business Media. This book was released on 2010-11-08 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference, in its second edition, contains more than 7,500 polymeric material terms, including the names of chemicals, processes, formulae, and analytical methods that are used frequently in the polymer and engineering fields. In view of the evolving partnership between physical and life sciences, this title includes an appendix of biochemical and microbiological terms (thus offering previously unpublished material, distinct from all competitors.) Each succinct entry offers a broadly accessible definition as well as cross-references to related terms. Where appropriate to enhance clarity further, the volume's definitions may also offer equations, chemical structures, and other figures. The new interactive software facilitates easy access to a large database of chemical structures (2D/3D-view), audio files for pronunciation, polymer science equations and many more.

Download or read book Silane Coupling Agents written by Edwin P. Plueddemann and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: * It has been rumored that a bumble bee has such aerodynamic deficiencies that it should be incapable of flight. Fiberglass-reinforced polymer com posites, similarly, have two (apparently) insurmountable obstacles to per formance: 1) Water can hydrolyze any conceivable bond between organic and inorganic phase, and 2) Stresses across the interface during temperature cycling (resulting from a mismatch in thermal expansion coefficients) may exceed the strength of one of the phases. Organofunctional silanes are hybrid organic-inorganic compounds that are used as coupling agents across the organic-inorganic interface to help overcome these two obstacles to composite performance. One of their functions is to use the hydrolytic action of water under equilibrium condi tions to relieve thermally induced stresses across the interface. If equilib rium conditions can be maintained, the two problems act to cancel each other out. Coupling agents are defined primarily as materials that improve the practical adhesive bond of polymer to mineral. This may involve an increase in true adhesion, but it may also involve improved wetting, rheology, and other handling properties. The coupling agent may also modify the inter phase region to strengthen the organic and inorganic boundary layers.

Download or read book Reverse Engineering of Rubber Products written by Saikat Das Gupta and published by CRC Press. This book was released on 2013-09-19 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reverse engineering is widely practiced in the rubber industry. Companies routinely analyze competitors’ products to gather information about specifications or compositions. In a competitive market, introducing new products with better features and at a faster pace is critical for any manufacturer. Reverse Engineering of Rubber Products: Concepts, Tools, and Techniques explains the principles and science behind rubber formulation development by reverse engineering methods. The book describes the tools and analytical techniques used to discover which materials and processes were used to produce a particular vulcanized rubber compound from a combination of raw rubber, chemicals, and pigments. A Compendium of Chemical, Analytical, and Physical Test Methods Organized into five chapters, the book first reviews the construction of compounding ingredients and formulations, from elastomers, fillers, and protective agents to vulcanizing chemicals and processing aids. It then discusses chemical and analytical methods, including infrared spectroscopy, thermal analysis, chromatography, and microscopy. It also examines physical test methods for visco-elastic behavior, heat aging, hardness, and other features. A chapter presents important reverse engineering concepts. In addition, the book includes a wide variety of case studies of formula reconstruction, covering large products such as tires and belts as well as smaller products like seals and hoses. Get Practical Insights on Reverse Engineering from the Book’s Case Studies Combining scientific principles and practical advice, this book brings together helpful insights on reverse engineering in the rubber industry. It is an invaluable reference for scientists, engineers, and researchers who want to produce comparative benchmark information, discover formulations used throughout the industry, improve product performance, and shorten the product development cycle.

Download or read book Surface Coatings written by Oil and Colour Chemists Association of Australia St and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arising from an examination in 1969 of the education and trammg opportumtles for paint industry technicians, it was recognized that the various courses available at that time did not fully serve their needs. While a few large companies had developed in-house training arrangements, the many medium and smaller fi.rms in the raw material supply, paint manufacturing or paint user industries, were unable to provide their own comprehensive training programs. With a view to improving this situation, an advisory committee comprising ofrepresentatives of the Australian Paint Manufacturers' Federation and the Oil and Colour Chemists' Association Australia was established to liaise directly with the New South Wales Department of Technical and Further Education. As a result plans were developed for the introduction of a Special Course in 'Surface Coatings Technology' in 1971, conducted by the Sydney Technical College. The scope of the course was designed to cover all aspects of surface coatings technology ranging from raw materials and formulations to the production, testing, evaluation, application and use of finished products. The course proved to be highly successful and in 1973 a similar syllabus was introduced by the Melboume School of Painting, Decorating and Signcrafts in Victoria. In 1980, New Zealand followed suit with a similar course conducted by the Auckland Technical Institute.

Download or read book Raw Materials Supply Chain for Rubber Products written by John S. Dick and published by Hanser Pub Incorporated. This book was released on 2014-06-30 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rubber industry is a vital part of the world economy. In this age of constantly changing economics and raw material "shortages of the week," this book should help the reader understand the overall technical and economic problems that are emerging which are beginning to affect the overall availability of many raw materials, chemical intermediates and final rubber products on the world scene. This book is truly unique in that it is the only one that traces all the important organic and inorganic synthesis routes for the manufacture of synthetic rubbers, various fillers, plasticizers, oils, curatives, antidegradants, adhesion promoters, flame retardants, tackifiers, and blowing agents through their respective intermediates to the base raw materials from earth extractions and agriculture.

Download or read book Essentials of Organic Chemistry written by Paul M. Dewick and published by John Wiley & Sons. This book was released on 2013-03-20 with total page 711 pages. Available in PDF, EPUB and Kindle. Book excerpt: Essentials of Organic Chemistry is an accessible introduction to the subject for students of Pharmacy, Medicinal Chemistry and Biological Chemistry. Designed to provide a thorough grounding in fundamental chemical principles, the book focuses on key elements of organic chemistry and carefully chosen material is illustrated with the extensive use of pharmaceutical and biochemical examples. In order to establish links and similarities the book places prominence on principles and deductive reasoning with cross-referencing. This informal text also places the main emphasis on understanding and predicting reactivity rather than synthetic methodology as well as utilising a mechanism based layout and featuring annotated schemes to reduce the need for textual explanations. * tailored specifically to the needs of students of Pharmacy Medical Chemistry and Biological Chemistry * numerous pharmaceutical and biochemical examples * mechanism based layout * focus on principles and deductive reasoning This will be an invaluable reference for students of Pharmacy Medicinal and Biological Chemistry.

Download or read book Medicinal Natural Products written by Paul M. Dewick and published by John Wiley & Sons. This book was released on 2002-01-03 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide covers classes of natural products in medicine, whether derived from plants, micro-organisms or animals. Structured according to biosynthetic pathway, it is written from a chemistry-based approach.

Download or read book Structure Property Relationships in Polymers written by Charles E. Carraher Jr. and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first concern of scientists who are interested in synthetic polymers has always been, and still is: How are they synthesized? But right after this comes the question: What have I made, and for what is it good? This leads to the important topic of the structure-property relations to which this book is devoted. Polymers are very large and very complicated systems; their character ization has to begin with the chemical composition, configuration, and con formation of the individual molecule. The first chapter is devoted to this broad objective. The immediate physical consequences, discussed in the second chapter, form the basis for the physical nature of polymers: the supermolecular interactions and arrangements of the individual macromolecules. The third chapter deals with the important question: How are these chemical and physical structures experimentally determined? The existing methods for polymer characterization are enumerated and discussed in this chapter. The following chapters go into more detail. For most applications-textiles, films, molded or extruded objects of all kinds-the mechanical and the thermal behaviors of polymers are of pre ponderant importance, followed by optical and electric properties. Chapters 4 through 9 describe how such properties are rooted in and dependent on the chemical structure. More-detailed considerations are given to certain particularly important and critical properties such as the solubility and permeability of polymeric systems. Macromolecules are not always the final goal of the chemist-they may act as intermediates, reactants, or catalysts. This topic is presented in Chapters 10 and 11.

Download or read book Polymers from Plant Oils written by Alessandro Gandini and published by John Wiley & Sons. This book was released on 2018-11-16 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unique state-of-the-art book on an important topic in renewable materials The purpose of this monograph is to provide a thorough outlook on the topic related to the synthesis and characterization of original macromolecular materials derived from plant oils, an important part of the broader steadily growing discipline of polymers from renewable resources. The interest in vegetable oils as sources of biodiesel and materials has witnessed a remarkable growth of scientific and industrial interest since the beginning of the third millennium responding to the pressing drive to implement sustainability in the energy and materials sectors. The book highlights the most relevant strategies being pursued to elaborate polymers derived from a variety of common oils, by direct activation or through chemical modifications yielding novel monomers. Because glycerol is the main byproduct of biodiesel production, it is treated here as the other logical source of macromolecular synthesis. Each of the different approaches is illustrated by an introductory layout of the underlying chemical mechanisms, followed by examples of notable achievements in terms of the properties and potential applications of the ensuing materials, which span a wide range of structures and performances. In particular, original pathways involving click-chemistry reactions as thiol-ene and Diels-Alder couplings and metathesis polymerizations are discussed and shown to reflect the involvement of a growing number of research programs worldwide.

Download or read book Feedstock Recycling of Plastic Wastes written by Jose Aguado and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of plastic materials has seen a massive increase in recent years, and generation of plastic wastes has grown proportionately. Recycling of these wastes to reduce landfill disposal is problematic due to the wide variation in properties and chemical composition among the different types of plastics. Feedstock recycling is one of the alternatives available for consideration, and Feedstock Recycling of Plastic Wastes looks at the conversion of plastic wastes into valuable chemicals useful as fuels or raw materials. Looking at both scientific and technical aspects of the recycling developments, this book describes the alternatives available. Areas include chemical depolymerization, thermal processes, oxidation and hydrogenation. Besides conventional treatments, new technological approaches for the degradation of plastics, such as conversion under supercritical conditions and coprocessing with coal are discussed. This book is essential reading for those involved in plastic recycling, whether from an academic or industrial perspective. Consultants and government agencies will also find it immensely useful.

Download or read book Polymer Characterization written by Nicholas P. Cheremisinoff and published by Univ. Press of Mississippi. This book was released on 1996-12-31 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides an overview of polymer characterization test methods. The methods and instrumentation described represent modern analytical techniques useful to researchers, product development specialists, and quality control experts in polymer synthesis and manufacturing. Engineers, polymer scientists and technicians will find this volume useful in selecting approaches and techniques applicable to characterizing molecular, compositional, rheological, and thermodynamic properties of elastomers and plastics.

Download or read book Polymer Particles written by Masayoshi Okubo and published by Springer Science & Business Media. This book was released on 2005-02-10 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this special volume on polymer particles, recent trends and developments in the synthesis of nano- to micron-sized polymer particles by radical polymerization (Emulsion, Miniemulsion, Microemulsion, and Dispersion Polymerizations) of vinyl monomers in environmentally friendly heterogeneous aqueous and supercritical carbon dioxide fluid media are reviewed by prominent worldwide researchers. In addition to the important challenges and possibilities with regards to design and preparation of functionalized polymer particles of controlled size, the topics described are of great current interest due to the increased awareness of environmental issues.

Download or read book Cosmetic and Pharmaceutical Applications of Polymers written by T. Cheng and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers continue to show almost amazing versatility. We have always known that polymers could be used for trinkets, toys and dishes. Now, however, we are no longer surprised to encounter these adaptable mate rials in almost every place we look. We find them in our cars, tools, electronic devices, building materials, etc. The use of polymeric mate rials in medicine is also well documented in previous books by one of the Editors (Gebelein) and by others. Likewise, the use of polymeric mate rials in pharmaceutical applications, especially in controlled release systems, is also well established. Nevertheless, the use of these ubiquitous chemicals is far less ob vious in the field of cosmetics, although modern cosmetic preparations rely heavily on polymers and this trend is certain to increase. This book brings together much of the basic information on polymers in cosmetics and compares this usage with similar applications in pharmaceutical and medical applications. Cosmetics, like medicine and pharmacy, dates back to antiquity. We can find uses of perfumes, balms and ointments in various old books, such as the Bible. For example, the use of ointments and balms is noted more than thirty eight times, and perfumes and related materials are cited at least twenty nine times in the Bible.