00000cmm a22000004i 4500 UP-99796217611095171 Buklod 20140201112921.0 m go j cr |n |||auu|a 110701s2011 xx u | eng d 9783709105146 (eBook) 3709105145 (eBook) (iLib)UPD-00212404604 DLC DML eng DMLUC TP 1180 P8 P65 2011eb Prisacariu, Cristina. Polyurethane elastomers [electronic resource] from morphology to mechanical aspects Cristina Prisacariu. Wein New York Springer c2011. 1 online resource (xxiv, 255 p.) ill. Introduction; 1. Chemistry of PUs; 2. Hydrogen bonding in polyurethanes; 3. PUs morphology and thermal behaviour; 4. PUs Mechanical Properties; 5. Sensitivity of elasticity to PUs chemical and physical structure; 6. PUs strain induced orientation and crystallization; Conclusions; Perspectives. IP-based subscription, access limited to within on-campus computer network. Access via Electronic Resources of the UPD University Library Website. 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. Electronic reproduction. New York SpringerLink 2011. Available via World Wide Web through SpringerLink. Polyurethane elastomers. Elastomers. Electronic books. SpringerLink (Online service). Available for University of the Philippines Diliman via SpringerLink. Click here to access http://link.springer.com/book/10.1007/978-3-7091-0514-6 (viewed 11 June 2014) FO Monograph UPD DMLR Electronic Resource