Download or read book The Preparation of a Polyurethane Elastomer and Evaluation of the Mechanical Properties written by Choung-lin Lo and published by . This book was released on 1960 with total page 370 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 Preparation Characterization and Evaluations of Polyurethane Elastomers Based on Polyether Glycol Toluene Diisocyanate and Extender Chain Reagents written by H. Q. Han and published by . This book was released on 2011 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, we focus on the preparation, microstructures, and properties of polyurethane (PU) elastomers by using polyether glycol, toluene diisocyanate, and extender chain reagent. We find that the elastomers prepared by using extender chain reagent exhibit the most excellent mechanical properties. Furthermore, by an optimum synthetic route, hard segments can be formed uniformly in the soft segments, leading to the perfect micro-phase separation. We also find that the relative molecular weight of polyether glycol can affect the mechanical properties of the synthesized PU elastomers, i.e., the more relative molecular weight, the more soft segments, and the smaller tensile strength, rupture strength, and rigidity.
Download or read book An Evaluation of the Physical Properties of Polyurethane Elastomer for Somatoprostheses written by James F. Bigalke and published by . This book was released on 1973 with total page 222 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 Preparation of Polyurethane Elastomer by Using Bis 3 allyloxy 2 propanol Diphenylolpropane as a Crosslinking Agent written by Kantima Kaenaramit and published by . This book was released on 1997 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to prepare polyurethane and polyurethane/polystyrene elastomers by using Bis-(3-allyloxy-2-propanol) diphenylolpropane (BAPD) as a crosslinking agent. BAPD contains unsaturated double bonds at both terminals and two hydroxy groups in the molecule. The structures of the obtained polyurethane and polyurethane/polystyrene elastomers are crosslinked network. The compatibility of different phases in the elastomers could be observed from the transparency of the materials and by SEM technique. The mechanical properties including tensile strength and elongation at break of PU and PU/PS elastomers were measured. The values of tensile strength and elongation at break of polymers were in the ranges of 9.59-77.01 kg/cm2 and 57.55-294.57 %, respectively depending upon the equivalent weight ratio, initiator and amount of styrene monomer used. The glass transition temperature and thermal stability were determined by differential scaning calorimetry and thermogravimetric analysis.
Download or read book Biomaterials written by Nesrin Hasirci and published by Springer Science & Business Media. This book was released on 2010-02-23 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomaterials: From Molecules to Engineered Tissue gives examples of the application areas of biomaterials involving molecules at one end of the spectrum and finished devices in the other. It covers molecular approaches as well as molecules functional in preparing and modifying biomaterials, medical devices and systems, tissue engineering and artificial organs. Chapters on biomedical informatics and ethics complement the design and production aspects with their contribution in informatics and ethical concerns of biomedical research. This is a reference book for the advanced graduate student eager to learn the biomaterials area and for all researchers working in medicine, pharmacy, engineering and basic sciences in universities, hospitals, and industry involved in biomaterials and biomedical device production.
Download or read book Polyurethanes Conference 2000 written by Api and published by CRC Press. This book was released on 2000-10-02 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conference proceedings from 'Defining the Future Through Technology- Polyurethanes', held in Westin Copley Place, Boston, Massachusetts, on October 8-11 2000. Sponsored by the Alliance for the Polyurethanes Industry.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Moisture Resistance Properties in Polyurethane Elastomers written by G. Devan Rajangam and published by . This book was released on 1991 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Urethane written by Kurt C. Frisch and published by CRC Press. This book was released on 2020-01-16 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flexible polyurenthane foams of all types are a unique group of plastics materials, characterized by the fact that a multitude of different sets of properties can be obtained by varying the levels of a relatively small number of base components in the formulations. Different foam grades, primarily characterized by density and hardness, can be obtained by changing the ratio between base polyol, polymer polyol, water, blowing agent, isocyanate and other components. It is not uncommon for foam producers in industrialized countries to manufacture more than one hundred different foam grades based on these basic chemicals, plus the ancillary chemicals needed for optimized processing. This has always made flexible polyurethane foams a highly suitable candidate for correlating these variations in the formulations with the resulting properties in a mathematical way, aimed at predicting the properties as accurately as possible, fine-tuning existing grades or designing new foam grades. This book discusses the methodology for obtaining meaningful equations for correlating properties with formulation variables and other influencing factors
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Development Progress Report written by United States. Office of Saline Water and published by . This book was released on 1968 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polyurethane Polymers Blends and Interpenetrating Polymer Networks written by Sabu Thomas and published by Elsevier. This book was released on 2017-08-15 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polyurethane Polymers: Blends and Interpenetrating Networks deals with almost all aspects of blends and IPNs formed by polyurethane, including the thermal, mechanical, morphological, and viscoelastic properties of each blend presented in the book. In addition, major applications related to these blends and IPNs are mentioned. Provides an elaborate coverage of the chemistry of polyurethane, including its synthesis and properties Includes available characterization techniques Relates types of polyurethanes to their potential properties Discusses blends options
Download or read book The Fracture Energy and Some Mechanical Properties of a Polyurethane Elastomer written by H. K. Mueller and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High throughput Impact Characterization of Mechanical Properties in Combinatorially Prepared Segmented Polyurethaneurea Elastomers written by Joe-Lahai Sormana and published by . This book was released on 2002 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rubber Nano Blends written by Gordana Markovic and published by Springer. This book was released on 2016-11-25 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the preparation, characterization and applications of rubber based nano blends. Rubbers from natural and synthetic polymers and their blends are discussed in the individual chapters, including nitrile, polyurethane, chlorosulphonated, polybutadiene, styrene butadiene, polychloroprene rubbers. In each chapter, contributors from academia and industry describe the preparation and characterization of the rubber blends. Therefore, a variety of characterization methods like tensile testing, differential scanning calorimetry, dynamical mechanical analysis, thermogravimetric analysis, electron microscopy, scattering and diffraction techniques, and rheology measurements are utilized. The authors evaluate the properties of the different materials and discuss numerous fields of application, ranging from biomedicine, packaging, coatings and automobile to aerospace.
