Chain Microstructure, Crystallization, and Morphology of Olefinic Blocky Copolymers

Chain Microstructure, Crystallization, and Morphology of Olefinic Blocky Copolymers
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烯烃嵌段共聚物的链微观结构、结晶和形态

DOI:
10.1002/macp.201200615
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发表时间:
2013-03
影响因子:
2.5
通讯作者:
Fan, Zhi-Qiang
Fan, Zhi-Qiang
中科院分区:
化学4区
文献类型:
--
作者:
Tong, Zai-Zai;Huang, Jie;Zhou, Bing;Xu, Jun-Ting;Fan, Zhi-Qiang

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比较了三种烯烃嵌段共聚物(OBC)的链微结构、结晶和形态。硬嵌段的重量百分比和其中的辛烯含量是根据13 C NMR光谱采用双中心一阶马尔可夫模型计算的。从熔融和结晶行为比较了硬嵌段的长度。通过DSC和广角X射线衍射(WAXD)测量的结晶度之间的显著差异表明存在部分有序相。小角X射线散射(SAXS)表明,OBC-A中的部分有序相主要位于晶相和非晶相之间的界面处,而OBC-B中的部分有序相则以分离的微区形式存在。随着硬嵌段变得更短,在OBC-C中也有更多的分离的部分有序相。通过POM在所有OBCs中观察到球晶,并且球晶的尺寸按以下顺序减小:OBC-A > OBC-B > OBC-C。TEM显示在OBC-B的薄膜中球晶发育不良。
The chain microstructure, crystallization, and morphology of three olefinic blocky copolymers (OBCs) are compared. The weight percentage of the hard block and the octene content in it are calculated from the13C NMR spectra with a two‐site first‐order Markovian model. The lengths of the hard blocks are compared from the melting and crystallization behaviors. The remarkable difference between the crystallinity measured by DSC, and wide‐angle X‐ray diffraction (WAXD) indicates the presence of partially ordered phases. Small angle X‐ray scattering (SAXS) shows that the partially ordered phases in OBC‐A are mainly located at the interface between the crystalline and amorphous phases, but exist as separated microdomains in OBC‐B. As the hard block becomes shorter, there are also more, separated partially ordered phases in OBC‐C. Spherulites are observed in all OBCs by POM and the size of the spherulites decreases in the order: OBC‐A > OBC‐B > OBC‐C. TEM shows that spherulites are poorly developed in a thin film of OBC‐B.
DOI: 10.1021/ma9811019
发表时间: 1998-11
期刊: Macromolecules
影响因子: 5.5
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通讯作者: Hsin‐Lung Chen;Shi-Fang Wang;Tsang-Lang Lin
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