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標題: Crystallization kinetics for low-ether-content polyether-polyester block copolymers with amide linkages
作者: Ho, R.M.
Hseih, P.Y.
Yang, C.C.
Lin, J.J.
關鍵字: crystallization kinetics;polyether-polyester;block copolymers;Avrami;hard segment length;poly(butylene terephthalate);isothermal;crystallization;polymer crystallization;dimensional crystals;growth;poly(ethylene-terephthalate);morphology;blends;polyarylate
Project: Journal of Polymer Science Part B-Polymer Physics
期刊/報告no:: Journal of Polymer Science Part B-Polymer Physics, Volume 39, Issue 20, Page(s) 2469-2480.
A series of low-ether-content polyether-polyester block copolymers with amide linkages were synthesized. Their crystallization kinetics and mechanisms were investigated. The crystallization kinetics were analyzed via Avrami treatment; an average value of 1.8 for the Avrami index was thus obtained. Athermal nucleation was evidenced by observations of a linear boundary between impinged spherulites under polarized light microscopy and transmission electron microscopy. The development of spherulitic morphology with a hedgehog texture was attributed to the mechanism of lamellar branching. On the basis of the morphological observations and Avrami analysis, a crystallization mechanism through a heterogeneous nucleation process with homogeneous lamellar branching was proposed. No regime transition was found for polyether-polyesters in the examined temperature ranges, and the crystallization was identified as regime I kinetics on the basis of a Lauritzen Z test. The copolymerization of poly(ether amide)s with polyesters led to a significant suppression of the crystallization rate of polyester crystals. The suppression was explained as the result of a dilution effect in nucleation combined with an increasing nucleation barrier. (C) 2001 John Wiley & Sons, Inc.
ISSN: 0887-6266
DOI: 10.1002/polb.1219
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