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Morphology, thermal and mechanical properties of solution-cast polyurethane films

✍ Scribed by J. Foks; H. Janik; R. Russo

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
752 KB
Volume
26
Category
Article
ISSN
0014-3057

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✦ Synopsis

A~tract--Solution-cast films of segmented polyurethanes based on poly(ethylene adipate)glycol, 4,4'-diphenylmethanediisocyanate and 1,4-butanediol have been investigated. Optical and electron microscopic studies revealed different amounts of birefringent aggregates, related to the casting temperature. In all the samples, the soft and hard segment crystallization took place and the samples were heterogeneous. Mechanical properties determined by stress-strain analysis, hysteresis at 50% elongation and dynamic mechanical analysis were consistent with phase-separated systems. Samples cast at higher temperatures (130, 145 Β°) contained more soft and hard segment in the crystalline state than a sample cast at lower temperature (70 Β°) and they had higher Young's modulus and hysteresis. The increase of hysteresis and permanent set was particularly attributed to the increase of crystallinity of the soft segment.

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