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Book Structure property Relationships in Segmented Elastomers

Download or read book Structure property Relationships in Segmented Elastomers written by John William Chapman Van Bogart and published by . This book was released on 1981 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Structure property Relationships in Polyurethane Elastomers

Download or read book Structure property Relationships in Polyurethane Elastomers written by Joseph John Marcinko and published by . This book was released on 1992 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Structure Property Relationships in Thermoplastic Elastomers III Segmented Polyacetal Polyurethanes

Download or read book Structure Property Relationships in Thermoplastic Elastomers III Segmented Polyacetal Polyurethanes written by J. C. W. Chien and published by . This book was released on 1985 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dihydroxy terminated polyacetals had been synthesized from aldehydes and glycols and used as soft segments to obtain segmented polyurethane block copolymers. The glass transition temperature (T sub G) of PacPU with 1,350 M sub n polyacetals is raised to -38 C and none was observed for shorter polyacetal chains. The copolymers can be synthesized to have a broad range of mechanical properties such as modulus from 0.5 to 130 MPa, stress at break from 0.7 to 21 MPa and elongation at break from 66% to 1300% through the variation of the constituents and composition. The rheological properties are only slightly dependent on temperature for symmetrical diisocyanates but quite temperature sensitive with asymmetrical diisocyanate copolymers. The polyacetals aere selected to build in acid catalyzed thermal decomposition of the thermoplastic elastomers. The hard and soft segments have TGA decomposition peaks at 292 and 343 C, respectively. Most copolymers display 2 peaks at temperatures between these two limits.

Book Structure Property Relationships in Thermoplastic Elastomers I Segmented Polyether Polyurethanes

Download or read book Structure Property Relationships in Thermoplastic Elastomers I Segmented Polyether Polyurethanes written by E. J. Woo and published by . This book was released on 1984 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Segmented poly(ether-b-urethanes) have been synthesized with 2000 MW polypropylene oxide coupled with diisocyanates and diol type chain extenders. The diisocyanates used were symmetric rigid 4,4'-diphenylmethane diisocyanate (MDI), linear aliphatic hexamethylene diisocyanate (HDI) and unsymmetric rigid toluene-2,4-diisocyanate (TDI). The chain extenders were symmetric N, N'-bis(2-hydroxyethyl) terephthalamide (BT) and N, N'-bis(2-hydroxyethyl)-hydroquinone (BH) unsymmetric N, N'-bis(2-hydroxyethyl)isophthalamide, and linear aliphatic butanediol. Hard segment contents ranged from 20 to 40 wt %. The thermal behavior of these materials is consistent with phase separation into separate hard and soft domains.

Book Structure property Relationships in Polymer polyols Based Polyurethane Elastomers

Download or read book Structure property Relationships in Polymer polyols Based Polyurethane Elastomers written by Nabil Abdulkader Saleh and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Processing Structure and Properties of Block Copolymers

Download or read book Processing Structure and Properties of Block Copolymers written by M.J. Folkes and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book I Structure property Relationships of Polyurethane Elastomers II Chemo rheological Properties of Isoprene butadiene Copolymer Networks

Download or read book I Structure property Relationships of Polyurethane Elastomers II Chemo rheological Properties of Isoprene butadiene Copolymer Networks written by Saadeddine Mohamed Abouzahr and published by . This book was released on 1981 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Handbook of Thermoplastic Elastomers

Download or read book Handbook of Thermoplastic Elastomers written by Jiri George Drobny and published by Elsevier. This book was released on 2014-05-30 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Thermoplastic Elastomers, Second Edition presents a comprehensive working knowledge of thermoplastic elastomers (TPEs), providing an essential introduction for those learning the basics, but also detailed engineering data and best practice guidance for those already involved in polymerization, processing, and part manufacture. TPEs use short, cost-effective production cycles, with reduced energy consumption compared to other polymers, and are used in a range of industries including automotive, medical, construction and many more. This handbook provides all the practical information engineers need to successfully utilize this material group in their products, as well as the required knowledge to thoroughly ground themselves in the fundamental chemistry of TPEs. The data tables included in this book assist engineers and scientists in both selecting and processing the materials for a given product or application. In the second edition of this handbook, all chapters have been reviewed and updated. New polymers and applications have been added — particularly in the growing automotive and medical fields — and changes in chemistry and processing technology are covered. Provides essential knowledge of the chemistry, processing, properties, and applications for both new and established technical professionals in any industry utilizing TPEs Datasheets provide "at-a-glance" processing and technical information for a wide range of commercial TPEs and compounds, saving readers the need to contact suppliers Includes data on additional materials and applications, particularly in automotive and medical industries

Book Polyurethane Elastomers

Download or read book Polyurethane Elastomers written by Cristina Prisacariu and published by Springer Science & Business Media. This book was released on 2011-07-03 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive account of the physical / mechanical behaviour of polyurethanes (PU ́s) elastomers, films and blends of variable crystallinity. Aspects covered include the elasticity and inelasticity of amorphous to crystalline PUs, in relation to their sensitivity to chemical and physical structure. A study is made of how aspects of the constitutive responses of PUs vary with composition: the polyaddition procedure, the hard segment, soft segment and chain extender (diols and diamines) are varied systematically in a large number of systems of model and novel crosslinked andthermoplastic PUs. Results will be related to: microstructural changes, on the basis of evidence from x-ray scattering (SAXS and WAXS), and also dynamic mechanical analyses (DMA), differential scanning calorimetry (DSC) and IR dichroism. Inelastic effects will be investigated also by including quantitative correlations between the magnitude of the Mullins effect and the fractional energy dissipation by hysteresis under cyclic straining, giving common relations approached by all the materials studied. A major structural feature explored is the relationship between the nature of the hard segment (crystallising or not) and that of the soft segments. Crystallinity has been sometimes observed in the commercial PUs hard phase but this is usually limited to only a few percent for most hard segment structures when solidified from the melt. One particular diisocyanate, 4,4’-dibenzyl diisocyanate (DBDI) that, in the presence of suitable chain extenders ( diols or diamines), gives rise to significant degrees of crystallinity [i-iii] and this is included in the present work. Understanding the reaction pathways involved, in resolving the subtle morphological evolution at the nanometre level, and capturing mathematically the complex, large-deformation nonlinear viscoelastic mechanical behaviour are assumed to bring new important insights in the world basic research in polyurethanes and towards applied industrial research in this area.

Book Structure Property Characterizations in Segmented Polyurethane Block Copolymers

Download or read book Structure Property Characterizations in Segmented Polyurethane Block Copolymers written by Jeffrey T. Koberstein and published by . This book was released on 1986 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relationships between microdomain structure and properties in segmented polyurethane elastomers have been elucidated by application of a number of sophisticated characterization techniques. Solid state deuterium NMR spectroscopy was used to explore the degree of phase separation in elastomers based upon 4,4'-diphenylmethane diisocyanate (MDI), butane diol(deuterium labelled)(BDO), and oxyethylene end-capped polyoxypropylene; and to study molecular motions in model hard segments of MDI/BDO and 2,4-toluene diisocyanate/BDO. The influence of morphological transitions on hydrogen bonding in the elastomers was examined by performing Fourier transform infrared spectroscopy simultaneously with a Differential Scanning Calorimeter (DSC) experiment. The origins of multiple endotherms in crystallizable polyurethanes were probed by performing simultaneous Small-Angle X-Ray Scattering (SAXS)/DSC and Wide-Angle X-Ray Diffraction (WAXD)/DSC experiments. Real-time SAXS and WAXD experiments have also been accomplished in order to characterize the kinetics of crystallization and microphase separation.

Book Structure Properties and Morphology Relationships of Polyurethane Elastomers Based on Urethane Amide and Urea Diols

Download or read book Structure Properties and Morphology Relationships of Polyurethane Elastomers Based on Urethane Amide and Urea Diols written by Lung-Turn Chen and published by . This book was released on 1987 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: