Effects of Molecular Weight on the Crystallization and Melting Behaviors of Poly(L-lactide)

Citation: Sheng Xiang, Shao Jun, Gao Li, Xin-chao Bian, Li-dong Feng, Xue-si Chen, Feng-qi Liu, Shao-yong Huang. Effects of Molecular Weight on the Crystallization and Melting Behaviors of Poly(L-lactide)[J]. Chinese Journal of Polymer Science, 2016, 34(1): 69-76. doi: 10.1007/s10118-016-1727-2 shu

Effects of Molecular Weight on the Crystallization and Melting Behaviors of Poly(L-lactide)

1.
1. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
2.
2. University of Chinese Academy of Sciences, Beijing 100049, China
3.
4.
College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
5.
Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
基金项目:
This work was financially supported by the National Natural Science Foundation of China (Nos. 51303176, 51373169, 51033003, 51473166 and 51403089) and Innovative Research Group (No. 51321062), and The National High-tech RD Program of China (863 program)(No. 2011AA02A202).

摘要: In this study, a series of monodispersed poly(L-lactide)(PLLA) were synthesized by the ring-opening polymerization with Schiff base aluminum catalyst, and the effects of the number-average molecular weight (Mn) on the crystallization and melting behaviors of PLLA were investigated by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). The total crystallization rate of PLLA was Mn-dependent, which reached the maximum value for PLLA with Mn of 18.6 kg/mol. In addition, when Mn of PLLA was 18.6 kg/mol, the melting enthalpy (Hm) showed a maximum value (87.1 J/g), which was the highest reported value till now. The critical temperature for change of crystal formation from -form to -form crystals increased in the isothermal crystallization process with Mn increasing. In the reheating procedure, high-Mn PLLA demonstrated a small exothermal peak prior to the dominant melting peak, corresponding to crystal transition from -to -form, but low-Mn PLLA didn't show the peak of crystal transition. These different crystallization and melting behaviors were attributed to the different chain mobility of PLLA with different Mn.

关键词:

English

Effects of Molecular Weight on the Crystallization and Melting Behaviors of Poly(L-lactide)

1.
1. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
2.
2. University of Chinese Academy of Sciences, Beijing 100049, China
3.
4.
College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
5.
Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Received Date: 02 July 2015
Revised Date: 22 August 2015
Available Online: 05 January 2016
Fund Project:
This work was financially supported by the National Natural Science Foundation of China (Nos. 51303176, 51373169, 51033003, 51473166 and 51403089) and Innovative Research Group (No. 51321062), and The National High-tech RD Program of China (863 program)(No. 2011AA02A202).

Abstract: In this study, a series of monodispersed poly(L-lactide)(PLLA) were synthesized by the ring-opening polymerization with Schiff base aluminum catalyst, and the effects of the number-average molecular weight (Mn) on the crystallization and melting behaviors of PLLA were investigated by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). The total crystallization rate of PLLA was Mn-dependent, which reached the maximum value for PLLA with Mn of 18.6 kg/mol. In addition, when Mn of PLLA was 18.6 kg/mol, the melting enthalpy (Hm) showed a maximum value (87.1 J/g), which was the highest reported value till now. The critical temperature for change of crystal formation from -form to -form crystals increased in the isothermal crystallization process with Mn increasing. In the reheating procedure, high-Mn PLLA demonstrated a small exothermal peak prior to the dominant melting peak, corresponding to crystal transition from -to -form, but low-Mn PLLA didn't show the peak of crystal transition. These different crystallization and melting behaviors were attributed to the different chain mobility of PLLA with different Mn.

Key words:

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Effects of Molecular Weight on the Crystallization and Melting Behaviors of Poly(L-lactide)

English

Effects of Molecular Weight on the Crystallization and Melting Behaviors of Poly(L-lactide)

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Effects of Molecular Weight on the Crystallization and Melting Behaviors of Poly(L-lactide)

English

Effects of Molecular Weight on the Crystallization and Melting Behaviors of Poly(L-lactide)

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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