Crystallization and Melting Behavior of PLLA/PDLA Stereocomplex Crystal

Wen-peng SHI; Xiao-qin WANG; Cen QIAN

doi:10.14028/j.cnki.1003-3726.2019.12.005

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Crystallization and Melting Behavior of PLLA/PDLA Stereocomplex Crystal

更新时间：2022-09-05

- Crystallization and Melting Behavior of PLLA/PDLA Stereocomplex Crystal
- Polymer Bulletin Vol. 32, Issue 12, Pages: 41-47(2019)
- 作者机构：
  
  常州工业职业技术学院，常州 213164
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2019.12.005
  CLC：
- Published：20 December 2019，
  
  Received：09 April 2019，
  
  Revised：06 November 2019，
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Wen-peng SHI, Xiao-qin WANG, Cen QIAN. Crystallization and Melting Behavior of PLLA/PDLA Stereocomplex Crystal. [J]. Polymer Bulletin 32(12):41-47(2019)
DOI：

Wen-peng SHI, Xiao-qin WANG, Cen QIAN. Crystallization and Melting Behavior of PLLA/PDLA Stereocomplex Crystal. [J]. Polymer Bulletin 32(12):41-47(2019) DOI： 10.14028/j.cnki.1003-3726.2019.12.005.

摘要

以水为引发剂合成了两种构型不同的左旋聚乳酸和右旋聚乳酸，运用DSC研究了分子量较低的PLLA/PDLA立构复合聚乳酸晶体的多重熔融行为，观察到随着180℃等温时间的增加，PLLA/PDLA共混物的立构复合晶体的熔点和熔融峰面积呈现震荡性变化行为，进一步的DSC和在线X射线研究结果显示，聚乳酸立构复合晶体多重熔融峰的震荡行为来自于晶体中就近生长的过量异构体链段的调整过程。

Abstract

Two different stereoregular polylactides

poly(L-lactide) (PLLA) and poly (D-lactide) (PDLA) were synthesized using water as co-initiator. The double melting behavior of PLLA/PDLA stereocomplex crystal (Sc-crystal)was studied with DSC and in situ X-ray measurements. The oscillation phenomenon of melting peak area and melting point was discovered and investigated with the increase of isothermal time at 180℃. Through DSC and situ X-ray measurements

it is found that driving force of the oscillation in melting peak area is the instability of the massive isomers in the PLLA/PDLA Sc-crystal

which comes from the adjacent folding mechanism of crystal growth.

关键词

左旋聚乳酸／右旋聚乳酸立构复合晶体震荡性行为片晶晶体生长

Keywords

PLLA/PDLAStereocomplex crystalOscillation behaviorLamellaeCrystal growth

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