Shear-induced crystallization in a blend of isotactic poly(propylene) and poly (ethylene-co-octene)

被引：44
|
作者：
Meng, Kun
Dong, Xia [1 ]
Zhang, Xiaohua
Zhang, Chenggui
Han, Charles C.
机构：
[1] Chinese Acad Sci, Inst Chem,Beijing Natl Lab Mol Sci, State Key Lab Polymer Phys & Chem, Joint Lab Polymer Sci & Mat, Beijing 100080, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China
来源：
MACROMOLECULAR RAPID COMMUNICATIONS | 2006年 / 27卷 / 19期
关键词：
blends; crystallization; phase separation; polyolefins; shear;
D O I：
10.1002/marc.200600403
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Shear-induced crystallization in a blend of isotactic poly(propylene) and poly(ethylene-co-octene) (iPP/ PEOc) has been investigated by means of in-situ optical microscopy and a shear hot stage under various thermal and shear histories. Cylindrites are observed after shear in the phase-separated iPP/PEOc blends for the first time. The nuclei (shish) come from the orientation of the entangled network chains, and the relationship between the shear rate and the network relaxation time of the oriented iPP chains is a very important factor that dominates the formation of the cylindrites after liquid-liquid phase separation. The cylindrites can grow through phase-separated domains with proper shear rate and shear time. In addition, the number of spherulites increases with shear rate, which is consistent with the notion of fluctuation-induced nucleation/crystallization.
引用
收藏
页码：1677 / 1683
页数：7
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