Temperature-dependent Crystallization and Phase Transition of Poly(L-lactic acid)/CO<sub>2</sub> Complex Crystals

Ying Zheng; Cai-Liang Zhang; Yong-Zhong Bao; Guo-Rong Shan; Peng-Ju Pan

doi:10.1007/s10118-021-2502-6

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Temperature-dependent Crystallization and Phase Transition of Poly(L-lactic acid)/CO₂ Complex Crystals

ARTICLE | Updated：2020-10-10

- Temperature-dependent Crystallization and Phase Transition of Poly(L-lactic acid)/CO₂ Complex Crystals
- Chinese Journal of Polymer Science Vol. 39, Issue 4, Pages: 484-492(2021)
- Affiliations：
  
  a.State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  b.Institute of Zhejiang University-Quzhou, Quzhou 324000, China
- Author bio：
  
  panpengju@zju.edu.cn
- Funds：
- DOI：10.1007/s10118-021-2502-6
  CLC：
- Received：20 July 2020，
  
  Revised：2020-8-11，
  
  Accepted：17 August 2020，
  
  Online First：10 October 2020，
  
  Published：01 January 2021
- Accepted：
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Zheng, Y.; Zhang, C. L.; Bao, Y. Z.; Shan, G. R.; Pan, P. J. Temperature-dependent crystallization and phase transition of poly(L-lactic acid)/CO₂ complex crystals. Chinese J. Polym. Sci. 2021, 39, 484–492 DOI: 10.1007/s10118-021-2502-6.

Ying Zheng, Cai-Liang Zhang, Yong-Zhong Bao, et al. Temperature-dependent Crystallization and Phase Transition of Poly(L-lactic acid)/CO₂ Complex Crystals[J]. Chinese Journal of Polymer Science, 2021, 39(4): 484-492. DOI: 10.1007/s10118-021-2502-6.
Zheng, Y.; Zhang, C. L.; Bao, Y. Z.; Shan, G. R.; Pan, P. J. Temperature-dependent crystallization and phase transition of poly(L-lactic acid)/CO₂ complex crystals. Chinese J. Polym. Sci. 2021, 39, 484–492 DOI: 10.1007/s10118-021-2502-6. DOI：

Ying Zheng, Cai-Liang Zhang, Yong-Zhong Bao, et al. Temperature-dependent Crystallization and Phase Transition of Poly(L-lactic acid)/CO₂ Complex Crystals[J]. Chinese Journal of Polymer Science, 2021, 39(4): 484-492. DOI: 10.1007/s10118-021-2502-6. DOI：

摘要

Abstract

Semicrystalline polymers can crystallize in the unique crystalline polymorph and show different phase behaviors under the high-pressure CO

treatment. Understanding such unique crystallization and phase transition behavior is of fundamental importance for the CO

-assisited processing of semicrystalline polymers. Herein

we investigated the polymorphic crystalline structure

phase transition

and structure-property relationships of poly(L-lactic acid) (PLLA) treated by CO

at different pressures (1−13 MPa) and crystallization temperatures (

’s

10−110 °C). PLLA crystallized in the PLLA/CO

complex crystals under 7−13 MPa CO

≤50 °C but the common

crystals under the high-pressure CO

≥70 °C. Solid-state nuclear magnetic resonance analysis indicated that the PLLA/CO

complex crystals possessed weaker interactions between the PLLA chains than the common

crystals. The PLLA/CO

complex crystals were metastable and transformed into the thermally stable

crystals

via

the solid-to-solid route during heating or annealing at the temperature above 50 °C. The complex crystals of PLLA produced at low

was more ductile than the

crystals due to the lower crystallinity and the plasticizing effect of CO

关键词

Keywords

references

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Temperature-dependent Crystallization and Phase Transition of Poly(L-lactic acid)/CO2 Complex Crystals

DOI：10.1007/s10118-021-2502-6

摘要

Abstract

关键词

Keywords

references

Temperature-dependent Crystallization and Phase Transition of Poly(L-lactic acid)/CO₂ Complex Crystals