Microstructure And Microphase Behavior Of Styrenic Block Copolymers And Their Sulfonated Ionomers
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Microstructure And Microphase Behavior Of Styrenic Block Copolymers And Their Sulfonated Ionomers
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Author : Sudhir Mani
language : en
Publisher:
Release Date : 1996
Microstructure And Microphase Behavior Of Styrenic Block Copolymers And Their Sulfonated Ionomers written by Sudhir Mani 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.
Synthesis And Characterization Of Block Copolymer Ionomers With Coexisting Dual Microphase Separated Morphologies
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Author :
language : en
Publisher:
Release Date : 1995
Synthesis And Characterization Of Block Copolymer Ionomers With Coexisting Dual Microphase Separated Morphologies written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
Three types of block copolymers were used to prepare block copolymer ionomers: (1) a triblock copolymer of styrene and ethylene-co-butylene (SEBS) obtained commercially and diblock and triblock copolymers of styrene and ethylene-co-propylene (SEP and SEPS) that were synthesized by anionic polymerization of styrene and isoprene followed by hydrogenation of the polyisoprene block. The styrene content of the SEBS was 30% (wt); the styrene content of the SEP and SEPS was varied from 10-50% to obtain spherical, cylindrical or lamellar microstructures. The styrene blocks were sulfonated to 0-18 mol% with acetyl sulfate, and the free acid derivative and the Na(+) and Zn(2+) salts were prepared. The block copolymer ionomers exhibited two different levels of microphase separation: (1) a block microstructure with a characteristic dimension of the order of 10-20 nm and an ionic microstructure of the order of 2A nm that was located within the styrene block microdomains. The effects of sulfonation, nature of the cation, temperature and sample preparation on the different microstructures and the properties of the polymers were studied by dynamic mechanical analysis, transmission electron microscopy, and small angle x-ray scattering. The effect of adding homopolymers that are miscible with the ionic phase was also studied. jg.
Processing Structure And Properties Of Block Copolymers
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Author : M.J. Folkes
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Processing Structure And Properties Of Block Copolymers written by M.J. Folkes 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 2012-12-06 with Technology & Engineering categories.
Block copolymers represent an important class of multi-phase material, which have received very widespread attention, particularly since their successful commercial development in the mid-1960s. Much of the interest in these polymers has arisen because of their rather remarkable micro phase morphology and, hence, they have been the subject of extensive microstructural examination. In many respects, the quest for a comprehensive interpretation of their structure, both theoretically and experimentally, has not been generally matched by a corresponding enthusiasm for developing structure/property relationships in the context of their commercial application. Indeed, it has been left largely to the industrial companies involved in the development and utilization of these materials to fulfil this latter role. While it is generally disappointing that a much greater synergism does not exist between science and technology, it is especially sad in the case of block copolymers. Thus these materials offer an almost unique opportunity for the application of fundamental structural and property data to the interpretation of the properties of generally processed artefacts. Accordingly, in this book, the editor has drawn together an eminent group of research workers, with the specific intention of highlighting some of those aspects of the science and technology of block copolymers that are potentially important if further advances are to be made either in material formulation or utilization. For example, special consideration is given to the relationship between the flow properties of block copo lymers and their microstructure.
Morphological Behavior Of Sulfonated Styrene Ethylene Propylene Styrene Triblock Copolymers
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Author :
language : en
Publisher:
Release Date : 2006
Morphological Behavior Of Sulfonated Styrene Ethylene Propylene Styrene Triblock Copolymers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Sulfonated block copolymer ionomers possessing short (1K g/mol) styrene blocks and various rubber block lengths were synthesized via sequential anionic polymerization of styrene, isoprene, and styrene followed by hydrogenation and sulfonation. The ionomers were then characterized by small-angle x-ray scattering (SAXS) and atomic force microscopy (AFM). The SAXS data indicate the presence of microphase-separated sulfonated styrene domains within the rubber phase. The morphology of the phase separation in this system is not clear from SAXS due to the absence of higher order maxima. Increased Bragg spacing was observed as the rubber block molecular weights increased, but decreased upon neutralization of the sulfonic acid groups with sodium hydroxide. The intensity of the SAXS maxima increased for shorter rubber block segments. AFM images confirmed the presence of microphase-separated domains which appear spherical.
Conference Proceedings
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Author : Society of Plastics Engineers. Technical Conference
language : en
Publisher:
Release Date : 1995
Conference Proceedings written by Society of Plastics Engineers. Technical Conference and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Plastics categories.
Assignment Of The Glass Transition
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Author : Rickey J. Seyler
language : en
Publisher: ASTM International
Release Date : 1994
Assignment Of The Glass Transition written by Rickey J. Seyler and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Amorphous substances categories.
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1995
American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Dissertation abstracts categories.
Papers Presented At The Meeting
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Author : American Chemical Society. Division of Polymer Chemistry
language : en
Publisher:
Release Date : 1992
Papers Presented At The Meeting written by American Chemical Society. Division of Polymer Chemistry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Chemistry categories.
Chemical Abstracts
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Author :
language : en
Publisher:
Release Date : 2002
Chemical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Chemistry categories.
Sequence Controlled Polymers
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Author : Jean-François Lutz
language : en
Publisher: John Wiley & Sons
Release Date : 2018-04-09
Sequence Controlled Polymers written by Jean-François Lutz 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 2018-04-09 with Technology & Engineering categories.
Edited by a leading authority in the field, the first book on this important and emerging topic provides an overview of the latest trends in sequence-controlled polymers. Following a brief introduction, the book goes on to discuss various synthetic approaches to sequence-controlled polymers, including template polymerization, genetic engineering and solid-phase chemistry. Moreover, monomer sequence regulation in classical polymerization techniques such as step-growth polymerization, living ionic polymerizations and controlled radical polymerizations are explained, before concluding with a look at the future for sequence-controlled polymers. With its unique coverage of this interdisciplinary field, the text will prove invaluable to polymer and environmental chemists, as well as biochemists and bioengineers.