A Facile Strategy to Enhance the Formation of Stereocomplex Crystallites in Poly(L-lactic acid)/Poly(D-lactic acid) Blend with High Molecular Weights

Chan-Na Zhong; Ya-Dong Liu; Juan Tang; Wei-Shuo Chen; Shuang-Cheng Li; Jun Shao; Hao-Qing Hou

doi:10.1007/s10118-023-2901-y

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A Facile Strategy to Enhance the Formation of Stereocomplex Crystallites in Poly(L-lactic acid)/Poly(D-lactic acid) Blend with High Molecular Weights

RESEARCH ARTICLE | Updated：2023-06-14

- A Facile Strategy to Enhance the Formation of Stereocomplex Crystallites in Poly(L-lactic acid)/Poly(D-lactic acid) Blend with High Molecular Weights
- Chinese Journal of Polymer Science Vol. 41, Issue 7, Pages: 1115-1122(2023)
- Affiliations：
  
  a.College of Chemistry & Chemical Engineering and Nanofiber Engineering Center of Jiangxi Province, Jiangxi Normal University, Nanchang 330022, China
  b.Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  c.National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, Jiangxi Normal University, Nanchang 330022, China
- Author bio：
  
  ydliu26@ciac.ac.cn (Y.D.L.)
  jun.shao@jxnu.edu.cn (J.S.)
- Funds：
- DOI：10.1007/s10118-023-2901-y
  CLC：
- Received：19 August 2022，
  
  Revised：2022-10-29，
  
  Accepted：14 November 2022，
  
  Online First：29 December 2022，
  
  Published：01 July 2023
- Accepted：
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Zhong, C. N.; Liu, Y. D.; Tang, J.; Chen, W. S.; Li, S. C.; Shao, J.; Hou, H. Q. A facile strategy to enhance the formation of stereocomplex crystallites in poly(L-lactic acid)/poly(D-lactic acid) blend with high molecular weights. Chinese J. Polym. Sci. 2023, 41, 1115–1122

Chan-Na Zhong, Ya-Dong Liu, Juan Tang, et al. A Facile Strategy to Enhance the Formation of Stereocomplex Crystallites in Poly(L-lactic acid)/Poly(D-lactic acid) Blend with High Molecular Weights[J]. Chinese Journal of Polymer Science, 2023, 41(7): 1115-1122.
Zhong, C. N.; Liu, Y. D.; Tang, J.; Chen, W. S.; Li, S. C.; Shao, J.; Hou, H. Q. A facile strategy to enhance the formation of stereocomplex crystallites in poly(L-lactic acid)/poly(D-lactic acid) blend with high molecular weights. Chinese J. Polym. Sci. 2023, 41, 1115–1122 DOI： 10.1007/s10118-023-2901-y.

Chan-Na Zhong, Ya-Dong Liu, Juan Tang, et al. A Facile Strategy to Enhance the Formation of Stereocomplex Crystallites in Poly(L-lactic acid)/Poly(D-lactic acid) Blend with High Molecular Weights[J]. Chinese Journal of Polymer Science, 2023, 41(7): 1115-1122. DOI： 10.1007/s10118-023-2901-y.

摘要

In this study

the SC exclusively developed rapidly when 2% graphite oxide incorporated into the PLLA/PDLA. The acceleration formation of SC was speculated due to the interaction between PLA molecular chains and the hydroxyl groups on the surface of graphite oxide and the obstruction of proliferation of graphite oxide.

Abstract

Blending of poly(levorotatory-lactic acid) (PLLA) and poly(dextrorotatory-lactic acid) (PDLA) produces the stereocomplex crystallites (PLA SC)

which present higher melting temperature and mechanical properties than that of neat PLLA or PDLA. However

in the PLLA/PDLA blends with higher molecular weights

the phase separation occurs and the SC exhibits weak memory after melting

which lead to a small amount of SC together with a large amount of homochiral crystallites (HC) develop during crystallization from the melt. In this study

a small content of graphite oxide was blended with PLLA and PDLA to form ternary blends

and it was exciting to find that the formation of SC was enhanced gradually with the content of graphite oxide. The SC exclusively developed when 2 wt% graphite oxide was incorporated into the PLLA/PDLA

and the crystallinity with ~50% was received even during fast cooling from the melt (−50 °C/min). The acceleration formation of SC was speculated due to the interaction between PLA molecular chains and the hydroxyl groups on the surface of graphite oxide and the obstruction of proliferation of graphite oxide.

关键词

Keywords

references

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