Influence of Chain Architectures on Crystallization Behaviors of PLLA Block in PEG/PLLA Block Copolymers

Sheng Xiang; Dong-Dong Zhou; Li-Dong Feng; Xin-Chao Bian; Gao Li; Xue-Si Chen; Tian-Chang Wang

doi:10.1007/s10118-019-2202-7

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Influence of Chain Architectures on Crystallization Behaviors of PLLA Block in PEG/PLLA Block Copolymers

ARTICLE | Updated：2021-02-18

- Influence of Chain Architectures on Crystallization Behaviors of PLLA Block in PEG/PLLA Block Copolymers
- Chinese Journal of Polymer Science Vol. 37, Issue 3, Pages: 258-267(2019)
- Affiliations：
  
  a.Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  b.Jilin Biomedical Polymers Engineering Laboratory, Changchun 130022, China
  c.University of Chinese Academy of Sciences, Beijing 100049, China
  d.South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou 510640, China
- Author bio：
  
  ligao@ciac.ac.cn (G.L.)
  xschen@ciac.ac.cn (X.S.C.)
- Funds：
- DOI：10.1007/s10118-019-2202-7
  CLC：
- Received：08 October 2018，
  
  Revised：2018-11-26，
  
  Accepted：28 November 2018，
  
  Online First：26 December 2018，
  
  Published：2019-03
- Accepted：
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Citation: Xiang, S.; Zhou, D. D.; Feng, L. D.; Bian, X. C.; Li, G.; Chen, X. S.; Wang, T. C. Influence of chain architectures on crystallization behaviors of PLLA block in PEG/PLLA block copolymers. Chinese J. Polym. Sci. 2019, 37, 258–267

Sheng Xiang, Dong-Dong Zhou, Li-Dong Feng, et al. Influence of Chain Architectures on Crystallization Behaviors of PLLA Block in PEG/PLLA Block Copolymers[J]. Chinese Journal of Polymer Science, 2019, 37(3): 258-267.
Citation: Xiang, S.; Zhou, D. D.; Feng, L. D.; Bian, X. C.; Li, G.; Chen, X. S.; Wang, T. C. Influence of chain architectures on crystallization behaviors of PLLA block in PEG/PLLA block copolymers. Chinese J. Polym. Sci. 2019, 37, 258–267 DOI： 10.1007/s10118-019-2202-7.

Sheng Xiang, Dong-Dong Zhou, Li-Dong Feng, et al. Influence of Chain Architectures on Crystallization Behaviors of PLLA Block in PEG/PLLA Block Copolymers[J]. Chinese Journal of Polymer Science, 2019, 37(3): 258-267. DOI： 10.1007/s10118-019-2202-7.

摘要

Abstract

The effect of the architecture of poly(ethylene glycol)/poly(L-lactide) (PEG/PLLA) block copolymers on the non-isothermal crystallization behaviors of PLLA blocks was investigated by differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). 1-Arm MPEG-

-PLLA and 4-arm PEG-

-PLLA (4PEG-

-PLLA) were synthesized by the ring-opening polymerization of L-lactide in the presence of poly(ethylene glycol) methyl ether (MPEG) and 4-arm poly(ethylene glycol) (4PEG). 4-Arm PLLA-

-MPEG (4PLLA-

-PEG) was synthesized by coupling 4-arm PLLA and MPEG. The WAXD results indicated that the crystalline structure of PLLA blocks did not alter due to the different chain architectures. The average values of Avrami index (

$$\bar n$$

http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=32489321&type=

) were all above 4

which indicated that the nucleation mechanism of PLLA blocks was heterogeneous nucleation

regardless of the architectures. The overall crystallization rates were decreased markedly as following: MPEG-

-PLLA

4PEG-

-PLLA

4PLLA-

-PEG

ascribed to the different confinement by PEG blocks and to the steric hindrance of chain architectures. Therefore

the crystallization of PLLA blocks became more difficult and the crystallization activation energy of the PLLA blocks increased due to the confinement of chain architectures.

关键词

Keywords

references

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