Crystallization kinetics and morphology of biodegradable poly(butylene succinate-co-propylene succinate)s
Crystallization kinetics and morphology of biodegradable poly(butylene succinate-co-propylene succinate)s
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DOI：
10.1002/polb.20877
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发表时间：
2007-02-15
影响因子：
--
通讯作者：
Xie, Xuming
中科院分区：
文献类型：
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作者：
Xu, Yongxiang;Xu, Jun;Xie, Xuming
分别使用H-1 NMR、DSC和POM研究了可生物降解的聚(丁二酸丁二醇酯)和共聚酯聚(丁二酸丁二醇酯-共-丁二酸丙二醇酯)(PBSPS)的结晶行为。通过Avrami方程分析了聚酯的等温结晶动力学。 Avrami指数n在2.2-2.8范围内，表明聚酯结晶过程中的结晶机制是具有球形生长几何形状的异相成核。等温结晶后的加热过程中观察到多个熔融峰，这可以用熔融再结晶模型来解释。通过广角X射线衍射(WAXD)鉴定PBSPS与PBS具有相同的晶体结构，这表明只有BS单元结晶，而PS单元处于非晶态。聚酯的晶体结构也不受结晶温度的影响。除了POM下正常的消光交叉外，在PBS和PBSPS的球晶中还观察到沿径向具有周期性距离的双带消光图案。球晶的形态很大程度上取决于结晶温度。 (c) 2007 年 Wiley 期刊公司。
The crystallization behavior of biodegradable poly(butylene succinate) and copolyesters poly(butylene succinate-co-propylene succinate)s (PBSPS) was investigated by using H-1 NMR, DSC and POM, respectively. Isothermal crystallization kinetics of the polyesters has been analyzed by the Avrami equation. The 2.2-2.8 range of Avrami exponential n indicated that the crystallization mechanism was a heterogeneous nucleation with spherical growth geometry in the crystallization process of polyesters. Multiple melting peaks were observed during heating process after isothermal crystallization, and it could be explained by the melting and recrystallization model. PBSPS was identified to have the same crystal structure with that of PBS by using wide-angle X-ray diffraction (WAXD), suggesting that only BS unit crystallized while the PS unit was in an amorphous state. The crystal structure of polyesters was not affected by the crystallization temperatures, too. Besides the normal extinction crosses under the POM, the double-banded extinction patterns with periodic distance along the radial direction were also observed in the spherulites of PBS and PBSPS. The morphology of spherulites strongly depended on the crystallization temperature. (c) 2007 Wiley Periodicals, Inc.