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|標題:||Crystallization kinetics for low-ether-content polyether-polyester block copolymers with amide linkages||作者:||Ho, R.M.
|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.||摘要:||
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.
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