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Polyurethanes. --- Polyuréthannes

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Polyurethanes --- Elastomers --- Polyuréthannes --- Elastomères

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The enchanting and worthy world of PU beckoned to bring forth the book titled "Polyurethane". The book is divided into three sections: structures, properties and characterization of PU, applications of PU and a separate section on Biobased PU, covering the research and development in these areas. Each contributed chapter handles new and interesting topics introducing the reader to the wider known and unknown applications of PU such as PU for grouting technologies, fuel binder, extraction of metals, treatment of industry wastewater, alkanolamide PU coatings and foams, and others. The book aims to cater a larger audience comprising of readers from polymer chemistry, materials chemistry, and industrial chemistry.

Polyurethanes --- Analysis. --- Urethane polymers --- Polymers --- Urethanes --- Polymer chemistry

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Flexible Polyurethane (PUR) foams have been used since the 1950s in textiles and furniture upholsteries, and in art and design objects that can now be found in museum collections. Composed from 'short-life' consumer materials, these objects present severe conservation problems as they age. This book presents an in-depth examination of the challenges presented by PUR foams; the case studies of preservation of two works by the artist Piero Gilardi; and a manual on preparing and applying a light stabilizing system that can protect new PUR foams from degrading and restore the flexibility of old foams.

Art --- Foam. --- Polyurethanes. --- Conservation and restoration. --- Flexible Polyurethane, art, design, conservation.

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   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.

Polyurethane elastomers. --- Polyurethanes -- Industrial applications. --- Polyurethane elastomers --- Elastomers --- Chemistry --- Chemical & Materials Engineering --- Physical Sciences & Mathematics --- Engineering & Applied Sciences --- Chemical Engineering --- Organic Chemistry --- Elastomers. --- Elastomeric materials --- Reinforced elastomers --- Urethane elastomers --- Chemistry. --- Polymers. --- Crystallography. --- Materials science. --- Polymer Sciences. --- Characterization and Evaluation of Materials. --- Polymers --- Plastics --- Rubber --- Surfaces (Physics). --- Crystallography and Scattering Methods. --- Physics --- Surface chemistry --- Surfaces (Technology) --- Leptology --- Physical sciences --- Mineralogy --- Polymere --- Polymeride --- Polymers and polymerization --- Macromolecules --- Polymers  . --- Material science