Polyolefin Blends Modified Through Peroxide Initiated Reactions
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Polyolefin Blends Modified Through Peroxide Initiated Reactions
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Author : Dong-Woo Yu
language : en
Publisher:
Release Date : 1992
Polyolefin Blends Modified Through Peroxide Initiated Reactions written by Dong-Woo Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Reactive Processing Of Polymers
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Author : M.W.R. Brown
language : en
Publisher: iSmithers Rapra Publishing
Release Date : 1994
Reactive Processing Of Polymers written by M.W.R. Brown and has been published by iSmithers Rapra Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Technology & Engineering categories.
Developments in machinery, materials and applications are outlined in the cond104 of commercial considerations and advances in fundamental understanding. The principles and benefits of polymer modification and blending via reactive extrusion are explained. A b257 of novel techniques which have developed out of the major reactive processes are also described. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database provides useful references for further reading.
Functionalisation Of Polyolefins With A Novel Monomer
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Author : Sheila Amy Cowtan
language : en
Publisher:
Release Date : 1996
Functionalisation Of Polyolefins With A Novel Monomer written by Sheila Amy Cowtan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Reactive extrusion (REX) has been used to functionalise polyolefins or to produce new polymers. Polyolefins are easily melt processed, but are difficult to bond, blend, paint or dye, because of their relatively inert nature. Extrusion grades of polypropylene (PP), linear low density polyethylene (LLDPq and high density polyethylene (HDPq have been studied with a view to the incorporation of useful functional qroups to overcome some of these difficulties. A novel reagent, meta-isopropenyl-a,a-dimethyl benzyl isocyanate (g-TMI), has been grafted onto polyolefins by a free-radical mechanism, using a thermally degradable peroxide as the free-radical source. The reaction was carried out in the melt phase of the polymer, using a Brabender Plastograph as a small batch reactor and an APV co-rotating twin-screw extruder as a larger scale continuous reactor. The products were characterised using fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC) and melt flow index (MFI) measurements. The level of grafting was assessed by FTIR. The concentrations of peroxide and of m-TMI were shown to affect the level of grafting. Optimum grafting in PP and in LLDPE occurred when the concentration of peroxide was greater than or equal to the concentration of m-TMI. GPC was used to determine the molecular weight and molecular weight distribution. The addition of peroxide decreased the molecular weight and narrowed the.
Advances In Polyolefin Nanocomposites
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Author : Vikas Mittal
language : en
Publisher: CRC Press
Release Date : 2010-12-07
Advances In Polyolefin Nanocomposites written by Vikas Mittal and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-12-07 with Technology & Engineering categories.
With the advent of polymer nanocomposites, research on polyolefin nanocomposites has grown exponentially. Correcting the deficiency of a meaningful text on these important materials, Advances in Polyolefin Nanocomposites:Sums up recent advances in nanoscale dispersion of filler in polyolefinsPresents a basic introduction to polyolefin nanocomposite
Search Of Excellence Antec 91
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Author : Society of Plastic Engineers
language : en
Publisher: CRC Press
Release Date : 1991-05-01
Search Of Excellence Antec 91 written by Society of Plastic Engineers and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-05-01 with Technology & Engineering categories.
Functionalized Nitroxyls For Use In Peroxide Initiated Modifications Of Polymers
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Author :
language : en
Publisher:
Release Date : 2014
Functionalized Nitroxyls For Use In Peroxide Initiated Modifications Of Polymers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Delayed-onset crosslinking of commodity polymers is accomplished by peroxide-initiated reactions of 4-acryloyloxy-2,2,6,6,-tetramethylpiperidine-N-oxyl (AOTEMPO) under solvent-free conditions. Consistent with previous studies of polyethylene cure formulations, AOTEMPO provides predictable induction periods for ethylene-rich copolymers, such as poly(ethylene-co-propylene) (EPR) and poly(ethylene-co-vinyl acetate) (EVA), without compromising ultimate crosslink densities. However, cure yields for AOTEMPO formulations of 1,2-polybutadiene (vinyl-BR) and 1,4-butadiene (cis-BR) fell well below those of nitroxyl-free formulations, due to lost backbone C=C group oligomerization during the induction period. Quenching a radical in these butadiene-rich materials eliminates multiple crosslinks, creating a deficit that acrylate oligomerization cannot overcome. As a result, AOTEMPO can only delay the onset of polybutadiene cures at the expense of crosslink yield. A new extension of AOTEMPO chemistry offers a means of crosslinking polymers that cleave when treated with peroxides alone. The severe degradation incurred by poly(ethylene oxide) (PEO) and polypropylene (PP) when heated with dicumyl peroxide (DCP) is arrested by nitroxyl trapping during the induction phase of the cure. Upon complete conversion of nitroxyl, oligomerization of pendant acrylate groups dominates scission of the polymer backbone, yielding the desired thermoset. Residual peroxide initiator beyond that required to convert macromonomer groups serves only to degrade the polymer network, necessitating the optimization of peroxide and AOTEMPO concentrations. Experiments conducted on PEO, PP, polyisobutylene (PIB), and poly(isobutylene-co-isoprene) (IIR) are discussed in terms of known principles of H-atom abstraction efficiency, acrylate oligomerization, and macroradical scission. The importance of H-atom transfer to AOTEMPO formulation efficacy has motivated the study of a technique for measuring the yield of macroradicals produced by peroxide thermolysis in a polymer melt. DCP decomposition in polymer compounds containing 4-(1-naphthoyloxy)-2,2,6,6-tetramethylpiperidine-1-oxyl (NTEMPO) generates polymer-bound alkoxyamines whose concentrations can be measured by fluorescence spectroscopy. Measurements of alkoxyamine yields are comparable to gas chromatography measurements of cumyl alcohol, which is an initiator byproduct of H-atom abstraction from the polymer.
Polyolefin Blends
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Author : Domasius Nwabunma
language : en
Publisher: John Wiley & Sons
Release Date : 2008-01-02
Polyolefin Blends written by Domasius Nwabunma and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-01-02 with Technology & Engineering categories.
The definitive reference on the properties and applications of polyolefin blends Polyolefins account for more than half of total plastics consumption in the world. In recent years, usage of and research on polyolefin blends have increased significantly due to new applications in medicine, packaging, and other fields and the development of novel polyolefins. With a special emphasis on nano- and micro-structures of crystals and phase morphology, Polyolefin Blends condenses and consolidates current information on polyolefins so that the reader can compare, select, and integrate a material solution. Focusing exclusively on the fundamental aspects as well as applications of polyolefin blends, this authoritative reference: * Features an introductory chapter that serves as a guide to polyolefin blends * Includes chapters covering formulation design, processing, characterization, modeling and simulation, engineering performance properties, and applications * Covers polyolefin/polyolefin blends and polyolefin/non-polyolefin blends * Discusses miscibility, phase behavior, functionalization, compatibilization, microstructure, crystallization, hierarchical morphology, and physical and mechanical properties * Covers new research trends including in-situ reactor blending and reactive processing, such as compatibilization/functionalization in the melt * Contains practical examples from open literature sources and commercial products With chapters contributed by leading experts from several countries, this is a must-have reference for scientists and engineers conducting research on polyolefin blends and for professionals in medical, packaging, and other commodity fields. It is also an excellent text for graduate students studying polymer science and polymer processing.
Advances In Polymer Processing
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Author : S Thomas
language : en
Publisher: Elsevier
Release Date : 2009-05-30
Advances In Polymer Processing written by S Thomas and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-05-30 with Technology & Engineering categories.
Processing techniques are critical to the performance of polymer products which are used in a wide range of industries. Advances in polymer processing: From macro- to nano- scales reviews the latest advances in polymer processing, techniques and materials. Part one reviews the fundamentals of polymer processing with chapters on rheology, materials and polymer extrusion. Part two then discusses advances in moulding technology with chapters on such topics as compression, rotational and blow moulding of polymers. Chapters in Part three review alternative processing technologies such as calendaring and coating, foam processing and radiation processing of polymers. Part four discusses micro and nano-technologies with coverage of themes such as processing of macro, micro and nanocomposites and processing of carbon nanotubes. The final section of the book addresses post-processing technologies with chapters on online monitoring and computer modelling as well as joining, machining, finishing and decorating of polymers. With is distinguished editors and team of international contributors, Advances in polymer processing: From macro- to nano- scales is an invaluable reference for engineers and academics concerned with polymer processing. Reviews the latest advances in polymer processing, techniques and materials analysing new challenges and opportunities Discusses the fundamentals of polymer processing considering the compounding and mixing of polymers as well as extrusion Assesses alternative processing technologies including calendaring and coating and thermoforming of polymers
Reactive Polymers Fundamentals And Applications
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Author : Johannes Karl Fink
language : en
Publisher: William Andrew
Release Date : 2013-04-11
Reactive Polymers Fundamentals And Applications written by Johannes Karl Fink and has been published by William Andrew this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-11 with Technology & Engineering categories.
The use of reactive polymers enables manufacturers to make chemical changes at a late stage in the production process—these in turn cause changes in performance and properties. Material selection and control of the reaction are essential to acheive optimal performance. The second edition of Reactive Polymers Fundamentals and Applications introduces engineers and scientists to the range of reactive polymers available, explains the reactions that take place, and details applications and performance benefits. Basic principles and industrial processes are described for each class of reactive resin (thermoset), as well as additives, the curing process, and applications and uses. The initial chapters are devoted to individual resin types (e.g. epoxides, cyanacrylates, etc.); followed by more general chapters on topics such as reactive extrusion and dental applications. Material new to this edition includes the most recent developments, applications and commercial products for each chemical class of thermosets, as well as sections on fabrication methods, reactive biopolymers, recycling of reactive polymers, and case studies. Injection molding of reactive polymers, radiation curing, thermosetting elastomers, and reactive extrusion equipment are all covered as well. Most comprehensive source of information about reactive polymers Covers basics as well as most recent developments, including reactive biopolymers, recycling of reactive polymers, nanocomposites, and fluorosilicones Indispensable guide for engineers and advanced students alike—providing extensive literature and patent review
Science And Technology Of Polymers And Advanced Materials
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Author : Paras N. Prasad
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Science And Technology Of Polymers And Advanced Materials written by Paras N. Prasad and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.
This book summarizes the state ofthe art research presented at the Fourth International Conference on Frontiers of Polymersand Advanced Materialsheld in Cairo, Egypt in January 4-9, 1997. This conference follows the successful conferences held in Kuala Lumpur, Malaysia in 1995, in Jakarta, Indonesia in 1993 andin New Delhi, India in 1991. These conferences focussed on the most recent and important advances in a wide range of carefully chosen subject areas dealing with advanced materials, their science and technology and new business opportunities resulting from recent technological advances. As its predecessors, the conference held in Cairo was truly international with strong participation of 488 deiegales representing 37 countries from the USA and Egypt, as weil as Europe, South East Asia, Japan, South Africa and the Middle East. The conference was organized by the Egyptian Academy of Scientific Research and Technology, The Arab Society ofMaterials Science and the State University ofNew Y ork at Butfalo. The stated goals ofthe conference were: • To highlight advances and new. findings in the general area of polymers and advanced materials. - • T o foster global collaboration between the USA, Egypt and other nations in the general field of polymers and advanced materials. • To promote the development of scientific ilifrastructure in this field among the different participating countries, especially in the Middle East. • To create a basisforfuture long-term scientific exchanges between the USA and Egypt, and/or other countries.