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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 The Influence of Chemical Structure on the Strength of Rubber

Download or read book The Influence of Chemical Structure on the Strength of Rubber written by A. N. Gent and published by . This book was released on 1986 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The detailed chemical structure of the polymer molecule has surprisingly little effect upon many of the important physical properties of crosslinked elastomers. For example, the elastic modulus, extensibility, tensile strength and tear strength are all much the same for many common elastomers. However, the strength of elastomers under some conditions is strikingly different. Two particular modes of fracture are considered here: tearing, and abrasive wear. Certain elastomers crystallize rapidly on stretching and become self-reinforcing, so that their tear strength is greatly enhanced. Factors that govern the speed of strain-induced crystallization are reviewed. In abrasive wear, the macroradicals generated by molecular rupture are highly reactive and their reactions affect both the nature and the extent of wear. The wear processes that occur in various reinforced elastomers are described and compared.

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 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Relationships Between Polyurethane Elastomer Structure and Ageing Properties Part 3 Effective Crosslink Structure

Download or read book Relationships Between Polyurethane Elastomer Structure and Ageing Properties Part 3 Effective Crosslink Structure written by and published by . This book was released on 1971 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of varying chemical group structure on the properties of polyurethane elastomers has been investigated. The introduction of urea and biuret groups into polyester and polyether urethanes by the use of 4,4'- methylene bis-(2-chloroaniline), MOCA, yielded elastomers with superior physical properties to elastomers which contained predominantly urethane groups and were chain extended and/or crosslinked with diols and triols. The ageing properties of polyurethane elastomers cured with blends of MOCA and 1,1'1''-trimethylol propane (TMP) were equal to elastomers in which MOCA or TMP were the sole curing agents.

Book Why Exhibit Works of Art

Download or read book Why Exhibit Works of Art written by John Alexander Pope and published by . This book was released on 1944 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Wplyw budowy segmentowych elastomerow poliuretanowych na ich wlasno ci deformacyjne

Download or read book Wplyw budowy segmentowych elastomerow poliuretanowych na ich wlasno ci deformacyjne written by W. Dzierza and published by . This book was released on 1980 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Index to Theses Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards

Download or read book Index to Theses Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 1970 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Effects of Hard Segment Content on the Chemical and Physical Properties of Polyether Urethane Thermoplastic Elastomers

Download or read book The Effects of Hard Segment Content on the Chemical and Physical Properties of Polyether Urethane Thermoplastic Elastomers written by A. Stamboulis and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Polyurethane Elastomers

Download or read book Polyurethane Elastomers written by C. Hepburn and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this monograph has been to distil into a single volume, in an easily read and assimilated format, the essentials of this often complex technology such that it is usable by all technical and semi-technical people who wish to become their own polyurethane and polyurethane elastomer expert.

Book Encyclopedia of Polymer Science and Technology Concise

Download or read book Encyclopedia of Polymer Science and Technology Concise written by Herman F. Mark and published by John Wiley & Sons. This book was released on 2013-10-16 with total page 1490 pages. Available in PDF, EPUB and Kindle. Book excerpt: The compact, affordable reference, revised and updated The Encyclopedia of Polymer Science and Technology, Concise Third Edition provides the key information from the complete, twelve-volume Mark's Encyclopedia in an affordable, condensed format. Completely revised and updated, this user-friendly desk reference offers quick access to all areas of polymer science, including important advances in nanotechnology, imaging and analytical techniques, controlled polymer architecture, biomimetics, and more, all in one volume. Like the twelve-volume full edition, the Encyclopedia of Polymer Science and Technology, Concise Third Edition provides both SI and common units, carefully selected key references for each article, and hundreds of tables, charts, figures, and graphs.

Book Engineered Materials Abstracts

Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1994-04 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: