Thermal and mechanical properties of poly(esterurethane) modified by copolyamide segments of various molecular weight

Thermoplastic polyurethane elastomers (TPUs) from diol‐terminated poly(ethylene adipate) (PEA), 1,4‐butanediol (BD) and 4,4′‐diphenylmethane‐diisocyanate (MDI) were modified by copolymerizing with diamine‐terminated nylon‐6/6,6 copolyamide (CPA) oligomers. The effects of content and molecular weight...

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Bibliographic Details
Published in:Polymer international 1995-03, Vol.36 (3), p.239-245
Main Authors: Ahn, Tae Oan, Oh, Myung-Hwan, Yoo, Kwang Sik, Jeong, Han Mo
Format: Article
Language:English
Subjects:
Applied sciences
copolyamide segments
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
poly(esterurethane)
Polycondensation
Preparation, kinetics, thermodynamics, mechanism and catalysts
thermal and mechanical properties
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Summary:Thermoplastic polyurethane elastomers (TPUs) from diol‐terminated poly(ethylene adipate) (PEA), 1,4‐butanediol (BD) and 4,4′‐diphenylmethane‐diisocyanate (MDI) were modified by copolymerizing with diamine‐terminated nylon‐6/6,6 copolyamide (CPA) oligomers. The effects of content and molecular weight of CPA segments on the thermal and mechanical properties of TPU were studied. PEA segments showed enhanced crystallization when some of the hard segments were replaced by CPA segments, showing weaker CPA–PEA interaction. The crystallinity of the hard segments was reduced, probably due to some interaction and phase mixing between hard and CPA segments. The modulus of TPU also decreased, more markedly with CPA segments of higher molecular weight.
ISSN:0959-8103
1097-0126
DOI:10.1002/pi.1995.210360303