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Thermal and mechanical properties of poly(esterurethane) modified by copolyamide segments of various molecular weight
Author(s) -
Ahn Tae Oan,
Oh MyungHwan,
Yoo Kwang Sik,
Jeong Han Mo
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210360303
Subject(s) - crystallinity , materials science , polymer chemistry , crystallization , thermoplastic polyurethane , adipate , thermoplastic elastomer , compatibilization , elastomer , chemical engineering , copolymer , composite material , polymer blend , polymer , engineering
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.