The Stereocomplex Formation and Phase Separation of PLLA/PDLA Blends with Different Optical Purities and Molecular Weights

Jun Shao; Yan-long Liu; Sheng Xiang; Xin-chao Bian; Jing-ru Sun; Gao Li; Xue-si Chen; Hao-qing Hou

doi:10.1007/s10118-015-1715-y

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The Stereocomplex Formation and Phase Separation of PLLA/PDLA Blends with Different Optical Purities and Molecular Weights

PAPER | Updated：2021-06-21

- The Stereocomplex Formation and Phase Separation of PLLA/PDLA Blends with Different Optical Purities and Molecular Weights
- The Stereocomplex Formation and Phase Separation of PLLA/PDLA Blends with Different Optical Purities and Molecular Weights
- Chinese Journal of Polymer Science 2015年33卷第12期页码：1713-1720
- Affiliations：
  
  a.College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
  b.Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Author bio：
  
  **Gao Li (李杲), E-mail: ligao@ciac.ac.cn
  Xue-si Chen (陈学思), E-mail: xschen@ciac.ac.cn
- Funds：
  
  National Natural Science Foundation of China(51273198;51373169;51033003;51303176;51321062;51403089);863 Program(2011AA02A202);Ministry of Science and Technology of China, and Innovative Research Group(51321062)
- DOI：10.1007/s10118-015-1715-y
  中图分类号：
- 收稿：2015-05-18，
  
  修回：2015-07-05，
  
  录用：2015-07-10，
  
  纸质出版：2015-12
- Accepted：
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Jun Shao, Yan-long Liu, Sheng Xiang, 等. The Stereocomplex Formation and Phase Separation of PLLA/PDLA Blends with Different Optical Purities and Molecular Weights[J]. Chinese Journal of Polymer Science, 2015,33(12):1713-1720.

Jun Shao, Yan-long Liu, Sheng Xiang, et al. The Stereocomplex Formation and Phase Separation of PLLA/PDLA Blends with Different Optical Purities and Molecular Weights[J]. Chinese Journal of Polymer Science, 2015, 33(12): 1713-1720.
Jun Shao, Yan-long Liu, Sheng Xiang, 等. The Stereocomplex Formation and Phase Separation of PLLA/PDLA Blends with Different Optical Purities and Molecular Weights[J]. Chinese Journal of Polymer Science, 2015,33(12):1713-1720. DOI： 10.1007/s10118-015-1715-y.

Jun Shao, Yan-long Liu, Sheng Xiang, et al. The Stereocomplex Formation and Phase Separation of PLLA/PDLA Blends with Different Optical Purities and Molecular Weights[J]. Chinese Journal of Polymer Science, 2015, 33(12): 1713-1720. DOI： 10.1007/s10118-015-1715-y.

摘要

Abstract

In this study

the poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blends with different optical purities of PLLA and various molecular weights of PDLA are prepared by solution mixing

and the stereocomplex formation and phase separation behaviors of these blends are investigated. Results reveal that optical purity and molecular weight do not vary the crystal structure of PLA stereocomplex (sc) and homochiral crystallites (hc). As the optical purity increasing in the blends

the melting temperature of sc (

) and the content of sc (Δ

) increased

while the melting temperature of hc (

) hardly changes

although the content of hc (Δ

) decreased gradually. The

and Δ

are also enhanced as the molecular weight of PDLA reduces

and the Δ

reduces rapidly even though the

does not vary apparently. With lower optical purities of PLLA and higher molecular weights of PDLA

three types of crystals form in the blends

i.e.

PLA sc

PLLA hc and PDLA hc. As molecular weight decreases and optical purity enhances

the crystal phase decreases to two (sc and PDLA hc)

and one (sc) finally. This investigation indicates that the phase separation behavior between PLLA and PDLA in the PLLA/PDLA blends not only depends on molecular weights

but also relies on the optical purities of polymers.

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