Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)-poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length

doi:10.1002/polb.20886

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	Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)-poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length
	Yang, Junliang; Zhao, Ting; Cui, Jijun; Liu, Leijing; Zhou, Yunchun; Li, Gao; Zhou, Enle; Chen, Xuesi
刊名	JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
	2006-11-15
卷号	44 期号:22 页码:3215-3226
关键词	differential scanning calorimetry (DSC) melt nonisothermal crystallization kinetics nucleation wide-angle X-ray diffraction (WAXD)
ISSN号	0887-6266
DOI	10.1002/polb.20886
通讯作者	Li, Gao(ligao@ciac.jl.cn)
英文摘要	The confined crystallization behavior, melting behavior, and nonisothermal crystallization kinetics of the poly(ethylene glycol) block (PEG) in poly(L-lactide)poly(ethylene glycol) (PLLA-PEG) diblock copolymers were investigated with wideangle X-ray diffraction and differential scanning calorimetry. The analysis showed that the nonisothermal crystallization behavior changed from fitting the Ozawa equation and the Avrami equation modified by Jeziorny to deviating from them with the molecular weight of the poly(L-lactide) (PLLA) block increasing. This resulted from the gradual strengthening of the confined effect, which was imposed by the crystallization of the PLLA block. The nucleation mechanism of the PEG block of PLLA15000-PEG5000 at a larger degree of supercooling was different from that of PLLA2500-PEG5000, PLLA5000-PEG5000, and PEG5000 (the numbers after PEG and PLLA denote the molecular weights of the PEG and PLLA blocks, respectively). They were homogeneous nucleation and heterogeneous nucleation, respectively. The PLLA block bonded chemically with the PEG block and increased the crystallization activation energy, but it provided nucleating sites for the crystallization of the PEG block, and the crystallization rate rose when it was heterogeneous nucleation. The number of melting peaks was three and one for the PEG homopolymer and the PEG block of the diblock copolymers, respectively. (c) 2006 Wiley Periodicals, Inc.
WOS研究方向	Polymer Science
语种	英语
出版者	JOHN WILEY & SONS INC
WOS记录号	WOS:000241754000004
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/85482]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li, Gao
作者单位	Grad Sch Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Yang, Junliang,Zhao, Ting,Cui, Jijun,et al. Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)-poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2006,44(22):3215-3226.
APA	Yang, Junliang.,Zhao, Ting.,Cui, Jijun.,Liu, Leijing.,Zhou, Yunchun.,...&Chen, Xuesi.(2006).Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)-poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,44(22),3215-3226.
MLA	Yang, Junliang,et al."Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)-poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 44.22(2006):3215-3226.