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Thermoplastic urethane elastomers. I. Effects of soft‐segment variations
Author(s) -
Seefried C. G.,
Koleske J. V.,
Critchfield F. E.
Publication year - 1975
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1975.070190912
Subject(s) - polycaprolactone , elastomer , materials science , thermoplastic elastomer , amorphous solid , glass transition , polymer , composite material , thermoplastic polyurethane , crystallization , diol , butanediol , thermoplastic , polymer chemistry , copolymer , polymer science , chemistry , organic chemistry , fermentation
A series of thermoplastic urethane elastomers with soft segments of varying sequence length was prepared and their dynamic mechanical properties were characterized over a wide temperature range. The polymers were prepared using various molecular weight polycaprolactone diols as the soft segment and 4,4′‐diphenylmethane diisocyanate and 1,4‐butanediol as the hard segment. The urethane elastomer exhibited soft‐segment crystallization when a polycaprolactone diol greater than 3000 M̄ n was used. The glass transition temperature of these materials progressively shifted to lower temperatures as the chain length of the soft segment was increased. This dependence was interpreted in terms of a molecular weight relationship similar to that associated with amorphous homopolymers. The dynamic mechanical properties of these polyurethanes appear to be consistent with responses observed for compatible copolymers.