Mixing of Racemic Poly(L-lactide)/Poly(D-lactide) Blend with Miscible Poly(D,L-lactide): Toward All Stereocomplex-type Polylactide with Strikingly Enhanced SC Crystallizability

Yi-Long Ju; Xiang-Li Li; Xing-Yuan Diao; Hong-Wei Bai; Qin Zhang; Qiang Fu

doi:10.1007/s10118-021-2588-x

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Mixing of Racemic Poly(L-lactide)/Poly(D-lactide) Blend with Miscible Poly(D,L-lactide): Toward All Stereocomplex-type Polylactide with Strikingly Enhanced SC Crystallizability

ARTICLE | Updated：2021-06-15

- Mixing of Racemic Poly(L-lactide)/Poly(D-lactide) Blend with Miscible Poly(D,L-lactide): Toward All Stereocomplex-type Polylactide with Strikingly Enhanced SC Crystallizability
- Chinese Journal of Polymer Science Vol. 39, Issue 11, Pages: 1470-1480(2021)
- Affiliations：
  
  College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
- Author bio：
  
  hongweibai@scu.edu.cn, bhw_168@163.com (H.W.B.)
  qiangfu@scu.edu.cn (Q.F.)
- Funds：
- DOI：10.1007/s10118-021-2588-x
  CLC：
- Received：02 March 2021，
  
  Revised：2021-4-3，
  
  Accepted：11 April 2021，
  
  Online First：15 June 2021，
  
  Published：18 September 2021
- Accepted：
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Ju, Y. L.; Li, X. L.; Diao, X. Y.; Bai, H. W.; Zhang, Q.; Fu, Q. Mixing of racemic poly(L-lactide)/poly(D-lactide) blend with miscible poly(D,L-lactide): toward all stereocomplex-type polylactide with strikingly enhanced SC crystallizability. Chinese J. Polym. Sci. 2021, 39, 1470–1480

Yi-Long Ju, Xiang-Li Li, Xing-Yuan Diao, et al. Mixing of Racemic Poly(L-lactide)/Poly(D-lactide) Blend with Miscible Poly(D,L-lactide): Toward All Stereocomplex-type Polylactide with Strikingly Enhanced SC Crystallizability[J]. Chinese Journal of Polymer Science, 2021, 39(11): 1470-1480.
Ju, Y. L.; Li, X. L.; Diao, X. Y.; Bai, H. W.; Zhang, Q.; Fu, Q. Mixing of racemic poly(L-lactide)/poly(D-lactide) blend with miscible poly(D,L-lactide): toward all stereocomplex-type polylactide with strikingly enhanced SC crystallizability. Chinese J. Polym. Sci. 2021, 39, 1470–1480 DOI： 10.1007/s10118-021-2588-x.

Yi-Long Ju, Xiang-Li Li, Xing-Yuan Diao, et al. Mixing of Racemic Poly(L-lactide)/Poly(D-lactide) Blend with Miscible Poly(D,L-lactide): Toward All Stereocomplex-type Polylactide with Strikingly Enhanced SC Crystallizability[J]. Chinese Journal of Polymer Science, 2021, 39(11): 1470-1480. DOI： 10.1007/s10118-021-2588-x.

摘要

Abstract

Stereocomplex-type polylactide (SC-PLA) consisting of alternatively arranged poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) chains has gained a good reputation as a sustainable engineering plastic with outstanding heat resistance and durability

however its practical applications have been considerably hindered by the weak SC crystallizability. Current methods used to enhance the SC crystallizability are generally achieved at the expense of the precious bio-renewability and/or bio-degradability of PLAs. Herein

we demonstrate a feasible method to address these challenges by incorporating small amounts of poly(D

L-lactide) (PDLLA) into linear high-molecular-weight PLLA/PDLA blends. The results show that the incorporation of the atactic PDLLA leads to a significant enhancement in the SC crystallizability because its good miscibility with the isotactic PLAs makes it possible to greatly improve the chain mixing between PLLA and PDLA as an effective compatibilizer. Meanwhile

the melt stability (

i.e.

the stability of PLLA/PDLA chain assemblies upon melting) could also be improved substantially. Very intriguingly

SC crystallites are predominantly formed with increasing content and molecular weight of PDLLA. More notably

exclusive SC crystallization can be obtained in the racemic blends with 20 wt% PDLLA having weight-average molecular weight of above 1×10

g/mol

where the chain mixing level and intermolecular interactions between the PLA enantiomers could be strikingly enhanced. Overall

our work could not only open a promising horizon for the development of all SC-PLA-based engineering plastic with exceptional SC crystallizability but also give a fundamental insight into the crucial role of PDLLA in improving the SC crystallizability of PLLA/PDLA blends.

关键词

Keywords

references

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