Download or read book The Grafting and Chemical Modification of Epoxidized Natural Rubber written by Johannes Petrus Vermeulen and published by . This book was released on 1999 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Rubber and Its Derivatives written by Azanam Shah Hashim and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This chapter summarizes various types of chemical modification of natural rubber (NR). These chemically modified NRs are known as NR derivatives. Chemical modification reviewed includes chemical modification without introducing new atom such as cyclized natural rubber and deproteinized natural rubber (DPNR), modification by introducing a chemical group such as hydrogenated natural rubber (HNR), chlorinated natural rubber (CNR) and epoxidized natural rubber (ENR) and lastly modification by grafting on NR. Grafting can be carried out using DPNR latex to yield styrene-grafted-NR, methyl methacrylate-grafted-NR and styrene and methyl methacrylate-grafted-NR. The NR derivatives are reviewed in terms of their preparation, mechanism, properties and applications.
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 Utilization of Atom Transfer Radical Polymerization for Synthesis of Graft Copolymer of Natural Rubber and Poly methylmethacrylate written by Lapporn Vayachuta and published by . This book was released on 2009 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atom Transfer Radical Polymerization (ATRP) technique was applied for synthesis of natural rubber-grafted-poly(methyl methacrylate) (NR-g-PMMA). Active sites on macromolecular chains of NR were created by fixation of bromoalkyl groups via a two-step chemical modification: partial epoxidation on unsaturated carbon-carbon bonds, followed by nucleophilic addition of a bromoalkyl-functionalized carboxylic acid on the oxirane rings of the epoxidized natural rubber (ENR) obtained. The resulting bromoalkyl-functionalized rubber was then used as macroinitiator to initiate the ATRP of methyl methacrylate (MMA) from NR chains by varying reaction conditions. The study was successively envisaged with 4-methyloct-4-ene (a model molecule of NR repeating unit), a synthetic cis-1,4-polyisoprene, and natural rubber. In the first part, the feasibility of the grafting reaction is verified by studying the ATRP of MMA from model molecules of bromoalkyl-functionalized 1,4-polyisoprene units. The model of the 1,4-polysisoprene unit, 4-methyloct-4-ene, is transformed in various models of bromoalkyl-functionalized 1,4-polyisoprene units via a chemical modification procedure carried out in two-steps: epoxidation performed with m-chloroperbenzoic acid (CPBA) followed by the addition of the bromoalkyl-functionalized carboxylic acid (2-bromopropionic acid, A1, or 2-bromo-2-methylpropionic acid, A2) on the oxirane ring formed. The addition of the acid occurs according to an SN2 mechanism with fixation of the acid group on the less substituted carbon of the oxirane ring and is competed with a secondary reaction of rearrangement of oxirane ring, leading to the formation of two allyl alcohols. The yield of the addition depends on the acidity of the carboxylic acid used. Afterwards, resulting O-(2-hydroxy-2-methyl-1-(n-propyl)pentyl)-2-bromopropionate and O-(2-hydroxy-2-methyl-1-(n-propyl)pentyl)-2-bromoisobutyrate, were used to initiate the ATRP of MMA at 90°C in toluene using Cu(I)Br complexed with a polyamine ligand. Several ligands were tested: N-(n-octyl)-2-pyridylmethanimine (NOPMI), N-(n-octadecyl)-2-pyridylmethanimine (NODPMI), and 1,1,4,7,7-pentamethyldiethylenetriamine (PMDETA). A good control of molecular weights (SECn,M) and polydispersity indexes (PDI) were obtained with O-(2-hydroxy-2-methyl-1-(n-propyl)pentyl)-2-bromoisobutyrate as the initiator in presence of CuBr/NOPMI as catalytic system. In the second part, the synthetic cis-1,4-polyisoprene (PI) is transformed into a bromoalkyl-functionalized polyisoprene (PI-Br) macroinitiator using a two-step chemical modification procedure similar to that used for synthesis of the model. PI was partially epoxidized using CPBA in dichloromethane, and then the epoxidized PI (EPI) obtained was reacted with A2. The addition of the acid occurs according to an SN2 mechanism with fixation of the acid group on the less substituted carbon of the oxirane ring ([beta]-addition) and is competed with rearrangement reactions of oxirane rings, leading to external allyl alcohol. SECn,M and PDI of PMMA grafts were determined by Size Exclusion Chromatography after separation from the PI backbone by hydrolysis of the ester bond using trifluoroacetic acid. An internal first order kinetic plot with respect to monomer and an increase of SECn,M with MMA conversion were observed using Cu(I)Br complexed with bidentate (NOPMI and NODPMI) and tridentate (PMDETA) ligands, as catalytic systems. With bidentate ligands, the PDI of grafts is better controlled. Moreover, the control of SECn,M and PDI of PMMA grafts was affected by increasing the degree of initiating units in PI-Br. In the last part, NR is used as a starting material. It was partially epoxidized in ENR in latex medium by reaction with performic acid generated in-situ from formic acid and hydrogen peroxide, and then ENR was transformed in bromoalkyl-functionalized NR (NR-Br) by nucleophilic addition of A2 on the oxirane rings. The addition of the acid is similar to that observed during the studies performed with 4-methyloct-4-ene and PI. Resulting NR-Br was then used to initiate the graft polymerization of MMA from NR chains using normal ATRP in toluene solution and in aqueous dispersed medium, respectively. AGET-ATRP was also considered in aqueous dispersed medium to study the effect of water for further ATRP graft copolymerization studies with NR latices. By normal ATRP in toluene solution, the termination reactions by recombination decreased as MMA concentration deceased, from 30 wt% to 10 wt%. PDIs of PMMA grafts vary in range from 1.7 (at 8.1 % MMA conversion) to 2.0 (at 52.0 % MMA conversion). A better control of the SECn,M and PDI of PMMA grafts was obtained by using normal ATRP in aqueous dispersed medium, more especially when CuBr was complexed with NODPMI. In these conditions, PDIs of PMMA grafts were low (closed to 1.5 at low MMA conversion). In AGET-ATRP performed in aqueous dispersed medium, it was shown that the efficiency of graft copolymerization is affected by the concentration in ascorbic acid used as reducing agent. The chemical structures obtained were characterized by FT-IR, and by 1H and 13C NMR. The thermal properties of the graft copolymers synthesized were studied by Differential Scanning Calorimetry (DSC). The presence of two Tgs, at about -14°C and 99°C respectively, on the DSC curves when the amounts of PMMA in NR-g-PMMAs are higher than 65 wt%, shows that these materials adopt a biphasic morphology.
Download or read book Chemistry Manufacture and Applications of Natural Rubber written by Shinzo Kohjiya and published by Elsevier. This book was released on 2014-02-17 with total page 543 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growing demand for more sustainable materials has led to increased research on the properties of natural rubber. Chemistry, Manufacture and Applications of Natural Rubber summarizes this research and its significance for the industrial applications of natural rubber. Chapters in part one explore the properties and processing of natural rubber, including the biosynthesis of natural rubber in different rubber-producing species, chemical modification of natural rubber for improved performance, and the effect of strain-induced crystallization on the physical properties of natural rubber. Further chapters highlight hydrophobic and hydrophilic silica-filled cross-linked natural rubber and computer simulation of network formation in natural rubber. Part two focusses on applications of natural rubber, including eco-friendly bio-composites using natural rubber matrices and reinforcements, soft bio-composites from natural rubber and marine products, natural rubber for the tire industry, the application of epoxidized natural rubber in pressure sensitive adhesives (PSAs), and the use of natural rubber for vibration isolation and earthquake protection of structures. Finally, chapters in part three consider environmental and safety issues associated with natural rubber, including improving the sustainable development of natural rubber, the recycling of natural and synthetic isoprene rubbers and of sulfur cross-linked natural rubber, and recent research on natural rubber latex allergy. Chemistry, Manufacture and Applications of Natural Rubber is a comprehensive resource for academics, chemists, chemical engineers, mechanical engineers, and other professionals in the rubber industry, as well as those industries, including automotive, civil, and medical engineering, using natural rubber products. An updated review with systematic and comprehensive coverage of natural rubbers Covers a broad range of topics, including the chemistry, processing, sustainability, and applications of natural rubbers Coverage of the best international research, including key experts from Asia, the United States, South America, and Europe
Download or read book Chemical Modification of Natural Rubber written by D. Barnard and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elastomers written by Nevin Çankaya and published by BoD – Books on Demand. This book was released on 2017-08-30 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary-Book Contents: Your purpose of reading this book is to concentrate on recent developments on elastomers. The articles collected in this book are contributions by invited researchers with a long-standing experience in different research areas. I hope that the material presented here is understandable to a broad audience, not only scientists but also people with many different disciplines. The book contains eleven chapters in two sections: (1) "Mechanical Properties of Elastomers" and (2) "Elastomers for Natural and Medical Applications." The book provides detailed and current reviews in these different areas written by experts in their respective fields. This book will be useful for polymer workers and other scientists alike and will contribute to the training of current and future researchers, academics, PhD students, and other scientists.
Download or read book Handbook of Natural Polymers Volume 2 written by M.S. Sreekala and published by Elsevier. This book was released on 2024-06-28 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Natural Polymers, Volume Two: Functionalization, Surface Modification, and Properties covers modifications, functionalization, analysis and properties of polymers from natural sources. The book begins by introducing the current state-of-the-art, challenges and opportunities in natural polymers. This is followed by detailed coverage of methods for chemical, physical and surface modifications, and functionalization of natural polymers, including nanocellulose composites, gluten, chitin, alginate, pectin, keratin, shellac, wool, hemicellulose, lignin, natural rubber, albumin, collagen, gelatin, zein, soya protein, silk fibroin, gutta percha and gum. The final chapters explain several other key aspects, such as microscopical and spectroscopical analysis, mechanical, thermal, and more. The book aims to offer potential avenues for the preparation, modification, and implementation of advanced natural polymer-based materials with the desired properties for specific applications. Provides systematic coverage of the latest methods for functionalization, surface modification, and properties' analysis of natural polymers Includes an extensive range of natural polymer sources, including established biopolymers and emerging materials Explores modifications and properties of natural polymers and their related composites, blends, IPNs, gels and nanoparticles
Download or read book Natural Rubber written by M.R. Sethuraj and published by Elsevier. This book was released on 2012-12-02 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt: No other book on natural rubber covers such a broad spectrum of subjects as this unique publication. Subjects related to the biology, cultivation and technology of natural rubber are dealt with, along with such important aspects as its history, production and processing, through to its sophisticated engineering applications. Every chapter follows a monograph style of presentation, with comprehensive citations and depth of treatment. Contributions from highly experienced, and still active, renowned scientists reflect the truly international effort to the development of this commodity. In addition to the wealth of information presented, most of the chapters contain elaborate lists of earlier contributions in the respective fields; one chapter each has been included on rubber wood, ancillary products and guayule.
Download or read book Malaysian Natural Rubber Compound UTeM Press written by Mohd Azli Salim and published by PENERBIT UTeM PRESS. This book was released on 2023-06-29 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focused on the mechanical properties of standard Malaysian natural rubber. On the other hand, it also represents the laminated rubber-metal spring (LR-MS) development for vibration isolator application. Besides, this book aims to implement the usage of Malaysian natural rubber up to four different mechanical approaches: tensile, compression, microscopic, and nanoindentation. This book, concludes the mechanical properties of different types of Malaysian natural rubber.
Download or read book Epoxidised Natural Rubber written by Siti Salina Sarkawi and published by Springer Nature. This book was released on 2023-06-03 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a complete guide to epoxidized natural rubber covering from the epoxidation chemistry, production process, raw rubber and compound properties, mixing recommendations as its applications in tire, engineering, general and industrial rubber goods, latex based products such as adhesive, foam and paint as well as sustainability or life cycle analysis of ENR rubber. Hence, it is useful for readers either from the industry which looking for specific product application and properties, or scientists and academicians working on their research using the ENR in their study for reference and guidance.
Download or read book Advances in Interpenetrating Polymer Networks written by Danie Klempner and published by CRC Press. This book was released on 1994-05-02 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rubber Products Manufacturing Technology written by AnilK. Bhowmick and published by Routledge. This book was released on 2018-10-03 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides authoritative coverage of compounding, mixing, calendering, extrusion, vulcanization, rubber bonding, computer-aided design and manufacturing, automation and control using microprocessors, just-in-time technology and rubber plant waste disposal.
Download or read book Micro and Nanostructured Epoxy Rubber Blends written by Sabu Thomas and published by John Wiley & Sons. This book was released on 2014-11-03 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Epoxy resins are polymers which are extensively used as coating materials due to their outstanding mechanical properties and good handling characteristics. A disadvantage results from their high cross-link density: they are brittle and have very low resistance to crack growth and propagation. This necessitates the toughening of the epoxy matrix without impairing its good thermomechanical properties. The final properties of the polymer depend on their structure. The book focuses on the microstructural aspects in the modification of epoxy resins with low molecular weight liquid rubbers, one of the prime toughening agents commonly employed. The book follows thoroughly the reactions of elastomer-modified epoxy resins from their liquid stage to the network formation. It gives an in-depth view into the cure reaction, phase separation and the simultaneous development of the morphology. Chapters on ageing, failure analysis and life cycle analysis round out the book.
Download or read book Study of the Preparation of Liquid Natural Rubber and Its Chemical Modification written by Prasert Khunkamchoo and published by . This book was released on 1983 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Rubber Materials written by Sabu Thomas and published by Royal Society of Chemistry. This book was released on 2014 with total page 635 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive two volume set covering the synthesis, characterization and applications of natural rubber based blends, interpenetrating polymer networks, composites and nanocomposites.
Download or read book Chemical Modification of Natural Rubber Studied by Nuclear Magnetic Resonance Spectroscopy written by Meegodage Cyril Senake Perera and published by . This book was released on 1985 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
