Abstract
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 (t 0.5) 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.
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This work was 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), and the Innovation Team Program of Science & Technology Department of Sichuan Province (No. 2013TD0013).
Invited paper for the special issue of “Polymer Crystallization”
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Liang, Yy., Tang, H., Zhong, Gj. et al. Formation of Poly(L-lactide) mesophase and its chain mobility dependent kinetics. Chin J Polym Sci 32, 1176–1187 (2014). https://doi.org/10.1007/s10118-014-1505-y
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DOI: https://doi.org/10.1007/s10118-014-1505-y