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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)

Sheng Xiang ^1,2,3 ,
Shao Jun ⁴ ,
Gao Li ⁵ ,
Xin-chao Bian ⁵ ,
Li-dong Feng ⁵ ,
Xue-si Chen ⁵ ,
Feng-qi Liu ⁴ ,
Shao-yong Huang ⁵

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: 2 July 2015
Revised Date: 22 August 2015

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).

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.
- Poly(L-lactide),
- Crystallization behavior,
- Melting behavior,
- Crystal transition
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