Effects of high molecular weight component on crystallization of polyethylene under shear flow

被引：102

作者：

Ogino, Y. ^{[1
]}

Fukushima, H. ^{[1
]}

Matsuba, G. ^{[1
]}

Takahashi, N. ^{[1
]}

Nishida, K. ^{[1
]}

Kanaya, T. ^{[1
]}

机构：

[1] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan

来源：

POLYMER | 2006年 / 47卷 / 15期

关键词：

crystallization under flow; Shish-kebab; high molecular weight component;

D O I：

10.1016/j.polymer.2005.08.102

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Crystallization of polyethylene (PE) blends of low and high molecular weight components under shear flow was studied using time-resolved depolarized light scattering (DPLS), focusing on effects of the high molecular weight component on the shish-kebab structure formation. Anisotropic two-dimensional scattering pattern due to shish-like structure formation was observed above a certain concentration of the high molecular weight PE. The threshold was about 2.5-3 times larger than the chain overlap concentration, suggesting an important role of entanglements of the high molecular weight component. On the basis of these results a gel-spinning-like mechanism for the shish-like structure formation has been proposed. The DPLS results also implied that the shish-like structure was mainly formed from the high molecular weight PE. This was confirmed by small-angle neutron scattering (SANS) and small-angle X-ray scattering (SAXS) measurements on an elongated PE blend of low molecular weight deuterated PE and high molecular weight hydrogenated PE (3 wt%). (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：5669 / 5677

页数：9

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