Download or read book Morphology and Fatigue Properties of Polyurethane Thermoplastic Elastomers written by Craig Wayne Stephen Myers and published by . This book was released on 1993 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polyurethane thermoplastic elastomers are segmented block polymers consisting of rubbery "soft" blocks and glassy or semi-crystalline "hard" blocks. Thermodynamic incompatibility between the soft and hard blocks causes the formation of a microdomain morphology which imparts elastomeric properties to the material. Despite their commercial importance, the response of these materials to repeated cyclic loading (fatigue) has not been well studied. This work is devoted to achieving a more detailed understanding of the chemical and morphological factors which govern fatigue behavior in polyurethane thermoplastic 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.
Download or read book The Effect of Strain on the Morphology and Mechanical Properties of Thermoplastic Polyurethane Elastomers TPEs written by Dawn Marie Crawford and published by . This book was released on 1997 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research discussed herein entails an investigation of the effect of strain on polymer morphology. Model thermoplastic polyurethane elastomers (TPEs) were subjected to tensile strains between 100% and 400% elongation and aged for varying lengths of time at ambient and elevated temperature. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were used to investigate the changes in morphology that occurred as a result of strain elongation. The effect of aging was also related to the TPE's mechanical properties such as abrasion resistance. DSC results indicate that the polymer undergoes morphology changes due to strain, resulting in some degree of phase mixing. DMA data suggest that strain aging causes a minor change in the glass transition temperature (Tg) but a significant change in the peak magnitude of E" and tan delta.
Download or read book The Effect of Strain on the Morphology and Mechanical Properties of Thermoplastic Polyurethane Elastomers TPEs written by Dawn Marie Crawford and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research discussed herein entails an investigation of the effect of strain on polymer morphology. Model thermoplastic polyurethane elastomers (TPEs) were subjected to tensile strains between 100% and 400% elongation and aged for varying lengths of time at ambient and elevated temperature. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were used to investigate the changes in morphology that occurred as a result of strain elongation. The effect of aging was also related to the TPE's mechanical properties such as abrasion resistance. DSC results indicate that the polymer undergoes morphology changes due to strain, resulting in some degree of phase mixing. DMA data suggest that strain aging causes a minor change in the glass transition temperature (Tg) but a significant change in the peak magnitude of E" and tan delta.
Download or read book Thermoplastic Elastomers written by J. A. Brydson and published by iSmithers Rapra Publishing. This book was released on 1995 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nature and general properties of TPE's are explained, and the classes of materials considered in turn include styrenic block copolymers, polyether-esters, polyamides, polyurethanes, polyolefins and other miscellaneous systems. Developments in specific market sectors are also outlined. The review is supported by an extensive References and Abstracts section, containing over 400 abstracts, which provide a great deal more information on these useful materials.
Download or read book Thermoplastic Elastomers written by Chapal Kumar Das and published by BoD – Books on Demand. This book was released on 2015-11-26 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermoplastic elastomers (TPEs), commonly known as thermoplastic rubbers, are a category of copolymers having thermoplastic and elastomeric characteristics. A TPE is a rubbery material with properties very close to those of conventional vulcanized rubber at normal conditions. It can be processed in a molten state even at elevated temperatures. TPEs show advantages typical of both rubbery materials and plastic materials. TPEs are a class of polymers bridging between the service properties of elastomers and the processing properties of thermoplastics. Nowadays, the best use of thermoplastics is in the field of biomedical applications, starting from artificial skin to many of the artificial human body parts. Apart from these, thermoplastic elastomers are being used for drug encapsulation purposes, and since they are biocompatible in many cases, their scope of applications has been broadened in the biotechnological field as well. The present book highlights many biological and biomedical applications of TPEs from which the broader area readers will benefit.
Download or read book Thermoplastic Elastomers written by Adel El-Sonbati and published by BoD – Books on Demand. This book was released on 2012-03-28 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermoplastics can be used for various applications, which range from household articles to the aeronautic sector. This book, "Thermoplastic Elastomers", is comprised of nineteen chapters, written by specialized scientists dealing with physical and/or chemical modifications of thermoplastics and thermoplastic starch. Such studies will provide a great benefit to specialists in food, electric, telecommunication devices, and plastic industries. Each chapter provides a comprehensive introduction to a specific topic, with a survey of developments to date.
Download or read book Study of Cure and Morphology mechanical Properties of Polyurethane Thin Film Elastomers written by Lorna D. Crosthwaite and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermoplastic Elastomers written by Günter Scholz and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-08-02 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a qualified and fast view into the world of TPE including the difference to rubber materials. It describes their classification as they are presented in the market, characterization, manufacturing, processing and behavior. Aside from the self-learning option, it is a companion to seminars and studies about elastomers.
Download or read book Nanocomposite Thermoplastic Elastomers Based on EPDM PP written by Ghasem Naderi and published by . This book was released on 2009-11 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Yearbook 13 written by Richard A. Pethrick and published by CRC Press. This book was released on 2019-08-22 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer Yearbook 13 brings together reviews and information on the progress of polymer science worldwide, including useful and topical information such as a list of new publications in polymer science and a compilation of dissertation abstracts. This volume includes reviews of key aspects of polymer science, including contributions from Russia, and details of important publications., This volume also contains reviews on state-of-the-art Japanese research presented at the annual Spring and Fall meetings of the Japanese Polymer Science Society. The aim of this section is to make information on the progress of Japanese polymer science, and on topics of current interest to polymer scientists in Japan, more easily available worldwide.
Download or read book A Study of the Synthesis Characterisation and Morphology of Polyurethane Thermoplastic Elastomers written by Sam Damiris and published by . This book was released on 1998 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Developments in Thermoplastic Elastomers written by K. E. Kear and published by iSmithers Rapra Publishing. This book was released on 2003 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermoplastic elastomers (TPEs) have the elastic behaviour of rubber and the processability of thermoplastics. The Freedonia Group has forecast that demand will expand by 6.4% per year to around 2.15 million tons in 2006. There is potential for these new, exciting materials to expand into the much larger thermoset rubber markets. This review includes comparisons between the two material types. There are three major types of TPE: block copolymers, rubber/plastic blends and dynamically vulcanised rubber/plastic alloys known as thermoplastic vulcanisates. The chemistry of these materials and how.
Download or read book A Study of Morphology wear Relationships in Thermoplastic Polyurethane Elastomers written by James Ivan Mardel and published by . This book was released on 1996 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue and Tribological Properties of Plastics and Elastomers written by Laurence W. McKeen and published by Butterworth-Heinemann. This book was released on 2009-11-17 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part of a series of core databooks within the William Andrew Plastics Design Library, Fatigue and Tribological Properties of Plastics and Elastomers provides a comprehensive collection of graphical multipoint data and tabular data covering fatigue and tribology. The concept of fatigue is very straightforward: if an object is subjected to a stress or deformation, and it is repeated, the object becomes weaker. This weakening of plastic material is called fatigue. Tribology is the science and technology of surfaces in contact with each other and therefore covers friction, lubrication and wear. The reduction of wear and fatigue and the improvement of lubrication are key bottom-line issues for engineers and scientists involved in the plastics industry and product design with plastics. Fatigue and Tribological Properties of Plastics and Elastomers, Second Edition is an update of all that has changed in the world of plastics since the 1st edition appeared nearly 15 years ago, and has been reorganized from a polymer chemistry point of view. A hard-working reference tool: part of the daily workflow of engineers and scientists involved in the plastics industry and product design with plastics The reduction of wear and fatigue and the improvement of lubrication are key bottom-line issues The data in this book provide engineers with the tools they need to design for low failure rates
Download or read book Effect of Hard Segments on Morphology and Properties of Thermoplastic Polyurethanes written by Chun-Sheng Wang and published by . This book was released on 1992 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
