Formation of Poly(L-lactide) Mesophase and Its Chain Mobility Dependent Kinetics  

作　　者：Yuan-ying Liang Hu Tang 钟淦基 李忠明 

机构地区：[1]College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University

出　　处：《Chinese Journal of Polymer Science》2014年第9期1176-1187,共12页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51120135002,51203104);the Doctoral Program of the Ministry of Education of China(No.20120181120101);the Program of Introducing Talents of Discipline to Universities(B13040);the Innovation Team Program of Science&Technology Department of Sichuan Province(No.2013TD0013)

摘　　要：In the present work, the PLLA mesophase formation and its kinetics at the advent of a chain mobility accelerator （polyethylene glycol （PEG）） are investigated by wide angle X-ray diffraction （WAXD） and time-resolved Fourier transform infrared spectroscopy （FTIR）. It is interestingly found that the presence of PEG could accelerate the formation of PLLA mesophase notably due to the enhanced chain mobility, giving rise to a substantially reduced half time （t0.5） of PLLA mesophase formation from 129 min to 8 min. The Avrami exponents （n） for the kinetics of mesophase formation are -0.5 for neat PLLA and 1 for PLLA/PEG, respectively, indicating that 1D-rod growth through heterogeneous nucleation occurs during formation of PLLA mesophase. Tensile testing demonstrates that PLLA mesophase could increase the tensile strength and modulus but decrease the elongation at break.In the present work, the PLLA mesophase formation and its kinetics at the advent of a chain mobility accelerator （polyethylene glycol （PEG）） are investigated by wide angle X-ray diffraction （WAXD） and time-resolved Fourier transform infrared spectroscopy （FTIR）. It is interestingly found that the presence of PEG could accelerate the formation of PLLA mesophase notably due to the enhanced chain mobility, giving rise to a substantially reduced half time （t0.5） of PLLA mesophase formation from 129 min to 8 min. The Avrami exponents （n） for the kinetics of mesophase formation are -0.5 for neat PLLA and 1 for PLLA/PEG, respectively, indicating that 1D-rod growth through heterogeneous nucleation occurs during formation of PLLA mesophase. Tensile testing demonstrates that PLLA mesophase could increase the tensile strength and modulus but decrease the elongation at break.

关 键 词：Poly（L-lactide） Chain mobility MESOPHASE Kinetics. 

分 类 号：O631.21[理学—高分子化学]