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
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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.
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