• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Distorted ring-banded spherulites in poly(L-lactic acid)/poly(epsilon-caprolactone) blends
【24h】

Distorted ring-banded spherulites in poly(L-lactic acid)/poly(epsilon-caprolactone) blends

机译：聚（L-乳酸）/聚（ε-己内酯）共混物中扭曲的带状球晶

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Unique distorted ring bands with wrinkles and concentric structures in blends of poly(L-lactic acid) (PLLA)/poly(epsilon-caprolactone) (PCL) were obtained by two-step isothermal crystallization and investigated by using polarized optical microscopy (POM) and atomic-force microscopy (AFM). Peculiar morphologies were revealed while the blends were crystallized by two-step crystallization with a fixed first crystallization temperature of 117 degrees C and different second crystallization temperatures. From the microscopy results, the morphology as the alternating ridges and valleys of wrinkle bands along with concentric ring bands can be resolved. The PLLA crystals could result in the structures of wrinkle bands and small concentric ring bands at the first crystallization temperature. Furthermore, formation of the alternating ridges and valleys of wrinkle bands could be suggested to be attributed to the different amounts of PCL inserted into the pre-formed crystals of PLLA while crystallizing the blends under a lower second crystallization temperature with fast crystallization of PCL. On the other hand at a higher second crystallization temperature, the wrinkle band changed to a branch-like band. PCL chains with high mobility could be sufficiently diffused and uniformly inserted into the pre-formed crystals of PLLA to generate more perfect crystals of PCL at the higher second crystallization temperature. The wrinkle bands with a significant ridge and valley structure vanished by changing the second crystallization to a higher one.
机译：通过两步等温结晶法获得了聚（L-乳酸）（PLLA）/聚（ε-己内酯）（PCL）的混合物中具有皱纹和同心结构的独特扭曲环带，并通过偏振光学显微镜（POM）进行了研究和原子力显微镜（AFM）。当共混物通过固定于117摄氏度的固定第一结晶温度和不同的第二结晶温度的两步结晶而结晶时，揭示了奇特的形态。从显微镜结果，可以解决皱纹带和同心环带交替的脊和谷的形态。 PLLA晶体可能在第一结晶温度下产生皱纹带和小的同心环带的结构。此外，皱纹带的交替的脊和谷的形成可能被认为是由于在较低的第二结晶温度下使共混物结晶并且PCL快速结晶的同时，插入到PLLA的预形成的晶体中的PCL的量不同。另一方面，在较高的第二结晶温度下，皱纹带变为分支状带。具有高迁移率的PCL链可以充分扩散并均匀地插入PLLA的预形成晶体中，从而在更高的第二结晶温度下生成更完美的PCL晶体。通过将第二次结晶更改为更高的结晶度，具有明显的凹凸结构的皱纹带消失了。

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