Strain-induced Stereocomplex Formation from the Initially Amorphous Poly(L-lactic acid)/Poly(D-lactic acid) Samples

Tao Liao; Zhi-yong Jiang; Yong-feng Men

doi:10.1007/s10118-025-3298-6

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Strain-induced Stereocomplex Formation from the Initially Amorphous Poly(L-lactic acid)/Poly(D-lactic acid) Samples

RESEARCH ARTICLE | Updated：2025-07-14

- Strain-induced Stereocomplex Formation from the Initially Amorphous Poly(L-lactic acid)/Poly(D-lactic acid) Samples
- Chinese Journal of Polymer Science Vol. 43, Issue 4, Pages: 655-665(2025)
- Affiliations：
  
  State Key Laboratory of Polymer Physics and Chemistry & Key Laboratory of Polymer Science and Technology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Author bio：
  
  tliao@ciac.ac.cn
- Funds：
- DOI：10.1007/s10118-025-3298-6
  CLC：
- Received：01 November 2024，
  
  Revised：2024-12-19，
  
  Accepted：19 December 2024，
  
  Online First：21 February 2025，
  
  Published：01 April 2025
- Accepted：
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Liao, T.; Jiang, Z. Y.; Men, Y. F. Strain-induced stereocomplex formation from the initially amorphous poly(L-lactic acid)/poly(D-lactic acid) samples. Chinese J. Polym. Sci. 2025, 43, 655–665

Tao Liao, Zhi-yong Jiang, Yong-feng Men. Strain-induced Stereocomplex Formation from the Initially Amorphous Poly(L-lactic acid)/Poly(D-lactic acid) Samples[J]. Chinese Journal of Polymer Science, 2025, 43(4): 655-665.
Liao, T.; Jiang, Z. Y.; Men, Y. F. Strain-induced stereocomplex formation from the initially amorphous poly(L-lactic acid)/poly(D-lactic acid) samples. Chinese J. Polym. Sci. 2025, 43, 655–665 DOI： 10.1007/s10118-025-3298-6.

Tao Liao, Zhi-yong Jiang, Yong-feng Men. Strain-induced Stereocomplex Formation from the Initially Amorphous Poly(L-lactic acid)/Poly(D-lactic acid) Samples[J]. Chinese Journal of Polymer Science, 2025, 43(4): 655-665. DOI： 10.1007/s10118-025-3298-6.

摘要

Direct strain-induced SC was observed. For the samples molded at 50 and 80 oC

this behavior is attributed to the considerable SC nuclei

which are assumed to act as physical cross-links to initiate strain-induced crystallization. At 120 oC

this phenomenon can be ascribed in part to the cold crystallization.

Abstract

The strain-induced crystallization behaviors of ultrasonic micro-injection molded poly(L-lactic acid)/poly(D-lactic acid) (PLLA/PDLA) samples from an amorphous state were investigated by stress-strain relations and

in situ

wide angle X-ray diffraction (WAXD) measurements. The formation of direct strain-induced stereocomplex (SC) was evident. In samples molded at 50 and 80 °C

this phenomenon can be attributed to the acceleration of the ordered structures due to the existence of a large number of SC nuclei. The SC nuclei are assumed to serve as the transient physical cross-links to initiate the strain-induced crystallization. The onset of strain-induced crystallization is analogous to the heating induced structural reorganization. Consequently

the observed strain-induced SC process can be considered a pseudo process

which is actually thermally induced. Upon further stretching

the actual strain-induced crystallization occurs with the exclusive formation of the homocrystallite (HC)

while the preceding formed SC crystals undergo slight fragmentation during subsequent tensile deformation. At 120 °C

due to the reduced number of SC nuclei within the sample

the occurrence of cold crystallization during stretching plays a more significant role than SC nuclei with respect to the strain

-induced SC process

as demonstrated by

in situ

WAXD measurements upon annealing in both the static and stretched states.

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references

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