Download or read book The Effects of Molecular Structure on the Physical Properties of Poly diethylsiloxane Elastomers written by Ronald Carl Hedden and published by . This book was released on 2000 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
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.
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.
Download or read book Handbook of Condensation Thermoplastic Elastomers written by Stoyko Fakirov and published by John Wiley & Sons. This book was released on 2006-05-12 with total page 643 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reporting on the work of an international team of scientists actively involved in the study of thermoplastic elastomers (TPE) based on polyesters, polyamides, and polyurethanes, this book is the first to provide a detailed description of condensation TPE with close attention paid to polyamide-based systems. Reflecting the increasing importance of TPE as engineering plastics, the authors discuss the widened application opportunities by preparing systems with various chemical compositions and molecular structures as (semi-) interpenetrating networks. The contents also cover the chemical aspects, physical structure and properties, life cycle assessment, and recycling possibilities as well as such unique "smart" properties like the shape memory effect of the three classes of thermoplastic elastomers.
Download or read book The Effect of Crosslink Structure on the Dynamic mechanical Properties of Poly dimethylsiloxane Elastomers written by J. R. Halladay and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the 134th meeting of the Rubber Division, American Chemical Society Cincinnati, Ohio October 18, 1988.
Download or read book Elastomers and Rubber Compounding Materials written by I Franta and published by Elsevier. This book was released on 2012-12-02 with total page 609 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elastomers and Rubber Compounding Materials reviews the properties of elastomers and particular groups of ingredients and chemicals mixed into the basic elastomer to form a rubber compound. After introducing the history of rubber industry and the general properties of rubber, the book discusses the properties, classification, concentration, stabilization, modification, application, transport, and storage of latex. It presents as well the methods of production, composition, physical properties, and chemical reactions of dry rubber. The book then focuses on the production and classification of different synthetic rubbers, such as styrene-butadiene, isoprene, butadiene, ethylene-propylene, and chloroprene. It also discusses the production, properties, and applications of elastomers, vulcanization chemicals, fillers, stabilizers, plasticizers, blowing agents, and textile reinforcing materials used in formulating rubber compounds. This book will be of great value not only to those who are in the rubber industry, but also to students of polymer science and rubber technology.
Download or read book The Influence of Chemical Structure on the Physical Properties of Polyurethane Elastomer Filaments written by S. M. Al-khayatt and published by . This book was released on 1967 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Poly Ethylene Glycol Segment on Physical and Chemical Properties of Poly Ether Ester Elastomers written by and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2000 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Synthesis and Study of Poly dimethyl Siloxane with Secondary Interactions and X Ray Studies of Poly diethyl Siloxane Elastomers written by Yixia Luo and published by . This book was released on 2001 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Structure on Physical Properties of Polymers written by Frank E. Karasz and published by . This book was released on 1976 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of stereochemical configuration in poly-alpha-chloroacrylic acid esters was studied principally with respect to the glass and other transitional properties. A substantial dependence of glass transition temperature on tacticity as theoretically predicted was found. The interaction of small molecules, principally water, with a series of segmented polyurethanes of systematically varied structure was investigated by transport, sorption and calorimetric measurements. Analysis in terms of 'bound' water models revealed cogent evidence for the amorphous nature of the adsorbate. A very sensitive measure of the effect of structure was found in a series of polymer miscibility studies on several chemically related binary systems which included poly(2,6-dimethyl phenylene oxide) (PPO)-polystyrene (PS). Thermodynamic, electrical, and mechanical properties of compatible and near-compatible systems were investigated in detail. Mechanical properties of solid polymers such as polymethyl solid polymers methacrylate under hydrostatic pressure were determined principally with respect to the transitional behavior of the amorphous phase. The effect of pressure on the equilibrium properties of the crystalline phase (high density polyethylene) was studied in a concomitant wide angle X-ray diffraction experiment. In a second dynamical mechanical study, compound flexural vibrations in thick beams of polymethyl methacrylate were measured and analyzed. It was shown that the contributions of shear and elongational deformations could be resolved thereby providing a complete isotropic elastic characterization of materials in such configurations.
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:
Download or read book Synthesis and Properties of Copolyester Elastomers Differing in Physical and Chemical Structures written by R. Ukielski and published by . This book was released on 1983 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Properties of Polymers written by D.W. van Krevelen and published by Elsevier. This book was released on 2012-12-02 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt: Properties of Polymers: Their Correlation with Chemical Structure; Their Numerical Estimation and Prediction from Additive Group Contributions summarizes the latest developments regarding polymers, their properties in relation to chemical structure, and methods for estimating and predicting numerical properties from chemical structure. In particular, it examines polymer electrical properties, magnetic properties, and mechanical properties, as well as their crystallization and environmental behavior and failure. The rheological properties of polymer melts and polymer solutions are also considered. Organized into seven parts encompassing 27 chapters, this book begins with an overview of polymer science and engineering, including the typology of polymers and their properties. It then turns to a discussion of thermophysical properties, from transition temperatures to volumetric and calorimetric properties, along with the cohesive aspects and conformation statistics. It also introduces the reader to the behavior of polymers in electromagnetic and mechanical fields of force. The book covers the quantities that influence the transport of heat, momentum, and matter, particularly heat conductivity, viscosity, and diffusivity; properties that control the chemical stability and breakdown of polymers; and polymer properties as an integral concept, with emphasis on processing and product properties. Readers will find tables that give valuable (numerical) data on polymers and include a survey of the group contributions (increments) of almost every additive function considered. This book is a valuable resource for anyone working on practical problems in the field of polymers, including organic chemists, chemical engineers, polymer processers, polymer technologists, and both graduate and PhD students.
