Polyolefin Miscibility
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Polyolefin Miscibility Solid State Nmr Investigation Of Phase Behavior In Saturated Hydrocarbon Blends
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Author :
language : en
Publisher:
Release Date : 2010
Polyolefin Miscibility Solid State Nmr Investigation Of Phase Behavior In Saturated Hydrocarbon Blends written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Polyolefin blends represent a vital material field due to their economic and commercial importance. Potential new properties such as lighter weight, lower cost and higher strength, motivate research to investigate blends of saturated hydrocarbon polymers. However, many questions remain concerning how polymer chain structure and packing influence local thermodynamics, or more specifically, the interplay between enthalpy and entropy, which ultimately control bulk phase behavior. Solid-state NMR has proven to be an essential tool in these studies due to its ability to selectively observe molecular level conformations and dynamics without isotopic labeling. Combinations of basic and advanced variable temperature studies such as 1D and 2D 13C cross-polarization exchange experiments, static 2H lineshape analysis, 1H relaxation/spin-diffusion measurements, and 129Xe experiments were applied in this work. Several systems were studied, including 50/50 weight percent blends of polyisobutylene with polyethylene-co-1-butene, polyisobutylene with head-to-head polypropylene, and atactic polypropylene with the same polyethylene-co-1-butene samples. The results were used to determine a relationship between miscibility, length scales of mixing, and timescales/length scales of the glass transition.
Polyolefin Miscibility
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Author : Justyna Ewa Wolak
language : en
Publisher:
Release Date : 2005
Polyolefin Miscibility written by Justyna Ewa Wolak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Keywords: enthalpy, entropy, blends, polyolefins.
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.
A Molecular Theory For Polyolefin Miscibility
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Author : Sameer D. Mehta
language : en
Publisher:
Release Date : 1997
A Molecular Theory For Polyolefin Miscibility written by Sameer D. Mehta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Miscibility Study Of Polyolefin Blends
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Author :
language : en
Publisher:
Release Date : 1993
Miscibility Study Of Polyolefin Blends written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
Miscibility Study Of Polyolefin Blends
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Author : Lierni Oiarzabal
language : en
Publisher:
Release Date : 1993
Miscibility Study Of Polyolefin Blends written by Lierni Oiarzabal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
Influence Of Monomer Structures On The Miscibility Of Polyolefin Blends
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Author : Jacek Dudowicz
language : en
Publisher:
Release Date : 1996
Influence Of Monomer Structures On The Miscibility Of Polyolefin Blends written by Jacek Dudowicz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Chemical engineering categories.
Polyolefin Blend Miscibility
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Author : Lance Wayne Gill
language : en
Publisher:
Release Date : 2012
Polyolefin Blend Miscibility written by Lance Wayne Gill and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Handbook Of Polyolefins
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Author : Cornelia Vasile
language : en
Publisher: CRC Press
Release Date : 2000-06-21
Handbook Of Polyolefins written by Cornelia Vasile and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-06-21 with Technology & Engineering categories.
A handbook on polyolefins. This second edition includes new material on the structure, morphology and properties of polyolefin (PO) synthesis. It focuses on synthetic advances, the use of additives, special coverage of PO blends, composites and fibres, and surface treatments. It also addresses the problem of interfacial and superficial phenomena.
Miscibility Enhancement In Polyisoprene Polyolefin Block Copolymers And Polymer Blends
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Author : Sravya Jangareddy
language : en
Publisher:
Release Date : 2022
Miscibility Enhancement In Polyisoprene Polyolefin Block Copolymers And Polymer Blends written by Sravya Jangareddy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
The growing awareness within the polymer science community that commercially viable materials can be developed by melt mixing already existing ones led to an interest to explore ways that improve miscibility between known polymers. This strategy allows for savings in research and development of new materials with equivalent properties, and for faster development time. This dissertation seeks to assist this endeavor by presenting a simple chemical modification method to enhance compatibility in classic polydiene-polyolefin systems.The foremost commercial application of polyisoprene, a polydiene that is the synthetic equivalent of natural rubber, is tire manufacture. If mixed well, saturated polybutadiene (hPB), a well-known polyolefin, can impart thermo-oxidative stability and improved gas-barrier properties to polyisoprene. However, polyisoprene and hPB are incompatible due to structural differences. Selectively saturated block copolymers prepared via living anionic polymerization showed significant improvement in polyisoprene/hPB compatibility (characterized by >50% decrease in interaction energy density, X) on randomly incorporating small amounts of styrene into the hPB chain. Moreover, the variation of block copolymer interaction energy with styrene content could be accurately predicted by standard mixing models like the regular mixing model and the copolymer equation model, at all levels of styrene incorporation. Analogous polymer blends displayed similar thermodynamic behavior, after correcting for fluctuation and end-group effects that become significant at low molecular weights. This similarity suggested that X is a segment-level parameter, independent of mixture architecture, as predicted by fundamental mixing theories.The polar modifier used for styrene-butadiene random copolymerization was evaluated for efficacy in randomizing the butadiene sequence with other styrenic monomers like 4-methylstyrene, 4-t-butylstyrene, and 4-vinylbiphenyl, to potentially expand the roster of species that could aid in PI/hPB compatibility enhancement. This modifier is effective in randomizing the 4-methylstyrene/butadiene sequence but proved to be ineffective for the others. This result was utilized to investigate polyisoprene-containing block copolymer thermodynamics in systems where 4-methylstyrene was incorporated into the hPB chain, instead of styrene. These block copolymers exhibited >25% decrease in X on incorporating ~25 wt% 4-methylstyrene, but the interaction energy variation with composition could not be accurately predicted by the regular mixing model or the copolymer equation model.