doi:10.1007/s10118-021-2502-6

Citation: 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 shu

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

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

Corresponding author: Peng-Ju Pan, E-mail: panpengju@zju.edu.cn
Received Date: 2020-07-20
Available Online: 2020-10-10

Figures(7)

Semicrystalline polymers can crystallize in the unique crystalline polymorph and show different phase behaviors under the high-pressure CO₂ treatment. Understanding such unique crystallization and phase transition behavior is of fundamental importance for the CO₂-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 CO₂ at different pressures (1−13 MPa) and crystallization temperatures (T_c’s, 10−110 °C). PLLA crystallized in the PLLA/CO₂ complex crystals under 7−13 MPa CO₂ at T_c≤50 °C but the common α crystals under the high-pressure CO₂ at T_c≥70 °C. Solid-state nuclear magnetic resonance analysis indicated that the PLLA/CO₂ complex crystals possessed weaker interactions between the PLLA chains than the common α crystals. The PLLA/CO₂ complex crystals were metastable and transformed into the thermally stable α 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 T_c was more ductile than the α crystals due to the lower crystallinity and the plasticizing effect of CO₂.
- Poly(lactic acid),
- CO₂,
- Complex crystal,
- Phase transition
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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