| Formation of Poly（L-lactide） Mesophase and Its Chain Mobility Dependent Kinetics |
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| 引用本文： | 钟淦基,李忠明. Formation of Poly（L-lactide） Mesophase and Its Chain Mobility Dependent Kinetics[J]. 高分子科学, 2014, 32(9): 1176-1187. DOI: 10.1007/s10118-014-1505-y |
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| 作者姓名： | 钟淦基 李忠明 |
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| 作者单位： | College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Siehuan University, Chengdu 610065, China |
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| 基金项目： | 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）;The authors are grateful to the National Synchrotron Radiation Laboratory （Hefei, China） and the beamline BL15U1 and BL16B1 of Shanghai Synchrotron Radiation Facility （SSRF, Shanghai, China） for the help with synchrotron X-ray scattering measurements. |
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| 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.
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| 关 键 词： | 中间相 动力学 L-丙交酯 流动 链条 傅立叶变换红外光谱 广角X射线衍射 PLLA |
Formation of Poly(L-lactide) mesophase and its chain mobility dependent kinetics |
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| Yuan-ying Liang,Hu Tang,Gan-ji Zhong,Zhong-ming Li. Formation of Poly(L-lactide) mesophase and its chain mobility dependent kinetics[J]. Chinese Journal of Polymer Science, 2014, 32(9): 1176-1187. DOI: 10.1007/s10118-014-1505-y |
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| Authors: | Yuan-ying Liang Hu Tang Gan-ji Zhong Zhong-ming Li |
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| Affiliation: | 1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China
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| 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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| Keywords: | Poly（L-lactide） Chain mobility Mesophase Kinetics. |
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