Relaxation of shear-enhanced crystallization in impact-resistant polypropylene copolymer: Insight from morphological evolution upon thermal treatment
Relaxation of shear-enhanced crystallization in impact-resistant polypropylene copolymer: Insight from morphological evolution upon thermal treatment
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抗冲击聚丙烯共聚物中剪切增强结晶的弛豫：热处理形态演变的见解
DOI：
10.1016/j.polymer.2010.09.008
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发表时间：
2010-10
期刊：
影响因子：
4.6
通讯作者：
Wu, Peiyi
中科院分区：
文献类型：
--
作者：
Feng, Jiachun;Song, Shijie;Wu, Peiyi
从相结构和形态演变的角度系统研究了热处理过程中抗冲共聚聚丙烯（IPC）剪切增强结晶的松弛现象。剪切能够加速IPC的结晶，而在熔融退火后，可以观察到一个自发的形态演变伴随着剪切增强结晶的逐渐松弛。结果发现，在松弛过程中的潜在的结构运动本质上是一个相分离的过程，朝着一个多层的相结构，其中可结晶的聚乙烯链段在空间上纠缠与乙烯-丙烯无规共聚物链。剪切增强结晶源于这种多层相结构的破坏，其释放可结晶的PE链段以接触作为聚丙烯结晶核的基质。在退火时，可以实现多层结构的重构，从而导致剪切增强结晶的弛豫。提出了一个描述IPC中相结构和结晶行为之间关系的概念模型。
Relaxation of shear-enhanced crystallization in an impact-resistant polypropylene copolymer (IPC) upon thermal treatment was systematically investigated, from the sight of phase structure and resultant morphological evolution. Shearing was capable of accelerating the crystallization of IPC, while upon melt annealing, a spontaneous morphological evolution can be observed accompanied by a gradual relaxation of shear-enhanced crystallization. It was found the underlying structural motion during relaxation is in essence a phase separation process towards a multi-layered phase structure, in which crystallizable polyethylene segments are spatially entangled with ethylene-propylene random copolymer chains. The shear-enhanced crystallization originates from the destruction of this multi-layered phase structure which releases crystallizable PE segments to contact the matrix serving as nuclei for the crystallization of polypropylene. Upon annealing, reconstruction of the multi-layered structure can be achieved leading to the relaxation of shear-enhanced crystallization. A conceptual model describing this relationship between phase structure and crystallization behavior in IPC has been proposed.
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影响因子：
4.6
作者：
MACKLEY, MR;KELLER, A
通讯作者：
KELLER, A
影响因子：
4.6
作者：
H. Tan;Li Li-Li;Zhineng Chen;Yihu Song;Q. Zheng
通讯作者：
H. Tan;Li Li-Li;Zhineng Chen;Yihu Song;Q. Zheng
影响因子：
4.6
作者：
C. Chen;W.Md.Z.W. Yunus;H. Chiu;T. Kyu
通讯作者：
C. Chen;W.Md.Z.W. Yunus;H. Chiu;T. Kyu
DOI：
10.1080/00222348808260838
发表时间：
1988-12
期刊：
Journal of Macromolecular Science, Part B
影响因子：
--
作者：
A. Freedman;D. Bassett;R. Olley
通讯作者：
A. Freedman;D. Bassett;R. Olley
影响因子：
4.6
作者：
Yong Chen;Ye Chen;Wei Chen;Decai Yang
通讯作者：
Yong Chen;Ye Chen;Wei Chen;Decai Yang