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题名: Formation of stereocomplex in enantiomeric poly(lactide)s via recrystallization of homocrystals: An in-situ X-ray scattering study
作者: Yin, Yongai1, 5; Liu, Guoming1; Song, Yan1, 5; Zhang, Xiuqin2; de Vos, Sicco3; Wang, Ruyin4; Joziasse, Cornelis A. P.3; Wang, Dujin1, 5
关键词: Poly(lactide) ; Stereocomplex ; Homocrystals ; In-situ study
刊名: EUROPEAN POLYMER JOURNAL
发表日期: 2016-09-01
卷: 82, 页:46-56
收录类别: SCI
英文摘要: The formation of stereocomplex (SC) in enantiomeric poly(lactide)s via recrystallization of homocrystals was investigated by using simultaneous wide-angle and small-angle X-ray scattering. When the symmetric blend of poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) was heated from the glassy state at a slow heating rate (5 degrees C/min), predominant homocrystals were formed during heating (cold crystallization). Melting of homocrystals and crystallization of stereocomplex occurred almost simultaneously. In this case, the diffusion of PLLA and PDLA chains played an important role in determining the maximum attainable SC crystallinity. The crystallization behavior during annealing at different temperatures (185 degrees C, 195 degrees C and 225 degrees C) and subsequent cooling was further investigated to understand the effectiveness of annealing on the formation of stereocomplex. The stereocomplex content was unchanged during annealing at 185 degrees C and kept constant during cooling to room temperature. The SC crystallinity increased slightly during annealing at 195 degrees C and subsequently cooling. On the other hand, the content of SC increased during annealing at 225 degrees C and increased remarkably during cooling. A possible mechanism considering the diffusion of PLLA and PDLA chains was proposed. (C) 2016 Elsevier Ltd. All rights reserved.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35373
Appears in Collections:工程塑料实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Beijing Inst Fash Technol, Sch Mat Sci & Engn, Beijing 100029, Peoples R China
3.Corb Purac, POB 21, NL-4200 AA Gorinchem, Netherlands
4.Corb Purac China, Unit 08-09,30F,6088 Humin Rd, Shanghai 201100, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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