首页> 外文期刊>Journal of Applied Polymer Science >Effect of the melting temperature on the crystallization behavior of a poly(L-lactide)/poly(D-lactide) equimolar mixture
【24h】

Effect of the melting temperature on the crystallization behavior of a poly(L-lactide)/poly(D-lactide) equimolar mixture

机译:熔融温度对聚(L-丙交酯)/聚(D-丙交酯)等摩尔混合物的结晶行为的影响

获取原文
获取原文并翻译 | 示例
           

摘要

The effect of the final melting temperature (T-f) on the crystallization of poly(L-lactide) (PLLA)/poly(D-lactide) (PDLA) was studied via a combination of differential scanning calorimetry, wide-angle X-ray scattering, polarized optical microscopy, and Fourier transform infrared (FTIR) spectroscopy. We observed that a residual stereocomplex (SC) crystal induced the formation of SC crystals during cooling from a T-f (230 degrees C) just above the melting peak of the SC crystals. On cooling from a T-f (240 degrees C) just above the endset temperature of SC crystal melting [T-m(S)(E)], the possible order structure and the strong interchain interaction promoted the preferential crystallization of SC crystals; this enhanced the formation of alpha crystals. During cooling from a T-f (>= 250 degrees C) far above T-m(S)(E), the crystallization peaks of alpha and SC crystals converged. The FTIR results indicated that the residual SC crystals, possible ordered structure, and interchain interactions in the melt might have been the key factors for the different crystallization of PLLA/PDLA. (C) 2015 Wiley Periodicals, Inc.
机译:通过差示扫描量热法,广角X射线散射相结合研究了最终熔融温度(Tf)对聚(L-丙交酯)(PLLA)/聚(D-丙交酯)(PDLA)结晶的影响,偏振光学显微镜和傅立叶变换红外(FTIR)光谱。我们观察到,残留的立体络合物(SC)晶体在从T-f(230摄氏度)的冷却过程中诱导了SC晶体的形成,而T-f刚好位于SC晶体的熔化峰上方。从刚好高于SC晶体熔化极限温度[T-m(S)(E)]的T-f(240摄氏度)冷却时,可能的有序结构和强烈的链间相互作用促进了SC晶体的优先结晶。这增强了α晶体的形成。在从远高于T-m(S)(E)的T-f(> = 250摄氏度)冷却期间,α和SC晶体的结晶峰会聚。 FTIR结果表明,熔体中残留的SC晶体,可能的有序结构以及链间相互作用可能是PLLA / PDLA不同结晶的关键因素。 (C)2015年Wiley Periodicals,Inc.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号