Internal structure and crystallinity investigation of segmented thermoplastic polyurethane elastomer degradation in supercritical methanol
Sign Up to like & getrecommendations! Published in 2017 at "Polymer Degradation and Stability"
DOI: 10.1016/j.polymdegradstab.2017.03.003
Abstract: This work is the first to investigate the internal structure and crystallinity variance of segmented thermoplastic polyurethane elastomer (TPU) degradation in supercritical methanol. Molecular weight distribution (MWD) and molecular structure were determined using GPC, FT-IR… read more here.
Keywords: degradation; segmented thermoplastic; hard segments; structure crystallinity ... See more keywords
Influence of well-defined hard segment length on the properties of medical segmented polyesterurethanes based on poly(ε-caprolactone-co-L-lactide) and aliphatic urethane diisocyanates
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DOI: 10.1080/00914037.2016.1233416
Abstract: ABSTRACT This work describes the preparation, characterization, mechanical properties, in vitro degradability, and cytocompatibility of two aliphatic segmented polyesterurethanes (SPEU-II, SPEU-III) based on poly(ε-caprolactone-co-L-lactide) and aliphatic urethane diisocyanate chain extenders. Two novel chain extenders containing… read more here.
Keywords: well defined; defined hard; hard segment; hard segments ... See more keywords
Synthesis and structure/properties characterizations of four polyurethane model hard segments
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DOI: 10.1098/rsos.180536
Abstract: Four model polyurethane (PU) hard segments were synthesized by reaction of butanol with four typical diisocyanates. The four diisocyanates were aromatic 4,4′-diphenylmethane diisocyanate (4,4′-MDI) and MDI-50 (50% mixture of 2,4′-MDI and 4,4′-MDI), cycloaliphatic 4,4′-dicyclohexylmethane diisocyanate… read more here.
Keywords: mdi; polyurethane; model; synthesis structure ... See more keywords
Modeling shear-induced crystallization in startup flow: The case of segmented copolymers
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DOI: 10.1122/1.5111687
Abstract: We propose to extend the well-known Doi–Edwards theory to model the viscosity divergence caused by shear-induced crystallization occurring upon startup flow experiments in segmented block copolymers ( M w ¯ = 50 kg mo l… read more here.
Keywords: relaxation; shear induced; crystallization; induced crystallization ... See more keywords
Parametric Resonance of Pipes with Soft and Hard Segments Conveying Pulsating Fluids
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DOI: 10.1142/s0219455418501195
Abstract: In this paper, the parametric resonance of pipes with soft and hard segments induced by pulsating fluids is investigated. The lowest six natural frequencies and mode shapes of the soft–hard combina... read more here.
Keywords: soft hard; pulsating fluids; parametric resonance; resonance pipes ... See more keywords
A Non-Isocyanate Route to Poly(Ether Urethane): Synthesis and Effect of Chemical Structures of Hard Segment
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DOI: 10.3390/polym14102039
Abstract: A series of non-isocyanate poly(ether urethane) (PEU) were prepared by an environmentally friendly route based on dimethyl carbonate, diols and a polyether. The effect of the chemical structure of polyurethane hard segments on the properties… read more here.
Keywords: non isocyanate; hard segment; ether urethane; poly ether ... See more keywords