Structure Property Relationships In Processed Styrenic Block Copolymer
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Structure Property Relationships In Processed Styrenic Block Copolymer
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Author :
language : en
Publisher:
Release Date : 1983
Structure Property Relationships In Processed Styrenic Block Copolymer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Chemistry, Organic categories.
Structure Property Relationships In Processed Styrenic Block Copolymer Homopolymer Blends
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Author : P. W. Reip
language : en
Publisher:
Release Date : 1983
Structure Property Relationships In Processed Styrenic Block Copolymer Homopolymer Blends written by P. W. Reip and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
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.
Practical Guide To Structures Properties And Applications Of Styrenic Polymers
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Author : Norbert Niessner
language : en
Publisher: Smithers Rapra
Release Date : 2013-03-18
Practical Guide To Structures Properties And Applications Of Styrenic Polymers written by Norbert Niessner and has been published by Smithers Rapra this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-18 with Science categories.
Styrenic polymers are among the economically most important plastics. They combine benign processing with a large variety of product properties - from stiff and transparent to tough and durable. The fact that styrene can be polymerized by different reaction mechanisms (radical, ionic and metal catalyzed) makes this line of products unique in regards to the variety of its properties and applications. The primary objective of this book is to provide a detailed understanding of structure and property relationships of styrenic polymers, and their specific use in various applications. By understanding basic chemistry, supermolecular assembly of block- and graft polymers and microscopic fracture mechanisms, the reader will be able to quickly derive macroscopic behavior and hence select the most suitable polymer for a given application. The second objective of this book is to provide a comprehensive overview about unique value propositions of styrenic polymers in different industries and applications. The reader will get an in-depth understanding of why specific styrenic polymers dominate in market segments like computer and printer housings, exterior automotive parts and the food packaging industry, and what the specific customer benefits of using these polymers are. Finally, the third objective is to provide an outlook for future product and application developments. Hence it serves not only as a quick reference guide for downstream industries, but also as a practical guide for students and researchers in this field of material science.
Processing Structure Properties Relationships In Polymers
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Author : Roberto Pantani
language : en
Publisher: MDPI
Release Date : 2019-12-05
Processing Structure Properties Relationships In Polymers written by Roberto Pantani and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-05 with Science categories.
This collection of research and review papers is aimed at depicting the state of the art on the possible correlations between processing variables, obtained structure and special properties which this structure induces on the plastic part. The extraordinary capacity of plastics to modify their properties according to a particular structure is evidenced for several transformation processes and for many applications. The final common goal is to take profit of this peculiar capacity of plastics by inducing, through a suitable processing, a specific spatial organization.
Structure Property Relationships In Block Copolymers
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Author : John Bard
language : en
Publisher:
Release Date : 1981
Structure Property Relationships In Block Copolymers written by John Bard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
Compounding And Processing Approaches For The Fabrication Of Shape Memory Ppolymers
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Author : Marcos Pantoja
language : en
Publisher:
Release Date : 2019
Compounding And Processing Approaches For The Fabrication Of Shape Memory Ppolymers written by Marcos Pantoja and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Aerogels categories.
Shape memory polymers (SMPs) are a type of material capable of indefinitely holding a deformed shape and recovering their original shape upon the application of an external stimulus, such as temperature. SMPs contain at least two networks consisting of a permanent crosslinked polymer matrix and a second reversible, shape fixing network. These networks could be chemically bonded in single chemistry systems such as block copolymers containing elastic and glassy or crystalline phases or be blended together through elastomer and crystalline small molecule mixtures. This dissertation primarily focuses on SMP blends derived from fatty acid-elastomer blends with the aim being to further simplify the fabrication of these materials. The mechanical, thermal, and morphological properties of a series of different blends, along with several styrenic block copolymers, were studied to understand the structure-property relationships between their permanent and reversible networks. In Chapter II, fatty acid swollen natural rubber shape memory polymers were investigated as a function of swelling extent, acid polarity, and applied deformation. The fatty acid-rubber systems demonstrate a 40-50 wt% effective fatty acid solid phase loading range where the fixity of a programmed shape remained > 95% while maintaining structural integrity. The strength of the crystalline fatty acid networks were determined through dynamic mechanical analysis (DMA) moduli measurements where, under large uniaxial deformations, the modulus of the fatty acid was found to increase compared to the unstrained material. This was consistent with preferential alignment of crystal platelets along the strain direction as determined by small angle X-ray scattering (SAXS) measurements. In Chapter III, SMP foams were fabricated by immersing a polyurethane foam inside stearic acid-isopropyl alcohol solutions of varying concentration. Samples were programmed using DMA or a compression press. It was determined that fixity increases with increasing wt% stearic acid, reaching 95% fixity with 29 wt% (1 vol%) stearic acid. Pre- and post-submersion volume measurements reveal that the foam volume increases after the solution treatment. Optical microscopy images illustrate that the stearic acid coats the foam struts, eventually filling the pores at higher stearic acid loading forming a percolating network whose strength increases with increasing stearic acid concentration. Chapter IV demonstrates that neat ABA thermoplastic elastomers are able to act as SMPs without the addition of an additional small molecule additive. It will be discussed how the shape memory properties depend on the molecular weight and shape programming conditions of the SMP, which is in turn related to the chain dynamics and reorganization of the block copolymer morphology under load. The shape memory performance was investigated using DMA. Optimum properties were obtained using a shape programming temperature of 90 °C, yielding fixity (the ability of the polymer to hold the applied deformation) and recovery (the ability of the polymer to recover its original shape) values of ca. 80 and 90%, respectively. Overall, a tradeoff between fixity and recovery was observed for all cases, achieving higher fixities at the expense of recovery and vice versa. Based on these findings a model explaining the shape memory mechanism of neat block copolymer SMPs is proposed. Chapter V presents a different project focusing and the synthesis and characterization of flexible polyimide aerogels. Aliphatic linkages were introduced into the backbone of polyimides through the synthesis of aromatic diamines containing aliphatic spacers. These linkages were varied between 4, 6, and 10 methylene carbons to tune the properties of the resulting aerogels. The density, dielectric constants, thermal and moisture stability, and mechanical properties (including compression, tensile, and three-point bending) of these aerogels were assessed to understand the effect of the amount and length of the methylene spacers on these properties. Overall, the polyimides were flexible at thicknesses up to 2-3 mm.
Structure Property Relationships In Polymers
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Author : Charles E. Carraher Jr.
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Structure Property Relationships In Polymers written by Charles E. Carraher Jr. 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 Science categories.
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.
Advanced Polymeric Materials
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Author : Gabriel O. Shonaike
language : en
Publisher: CRC Press
Release Date : 2003-04-14
Advanced Polymeric Materials written by Gabriel O. Shonaike and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-04-14 with Technology & Engineering categories.
Featuring contributions from experts at some of the world's leading academic and industrial institutions, Advanced Polymeric Materials: Structure Property Relationships brings into book form a wealth of information previously available primarily only within computer programs. In a welcome narrative treatment, it provides comprehensive coverage of p
Structure Property Relationships In Poly Ester Urethane Block Copolymers Effect Of Soft Segment Molar Mass
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Author : R. Varahamurthy
language : en
Publisher:
Release Date : 1987
Structure Property Relationships In Poly Ester Urethane Block Copolymers Effect Of Soft Segment Molar Mass written by R. Varahamurthy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.