Newtonian flow behavior of hyperbranched high-molecular-weight polyethylenes produced with a Pd-diimine catalyst and its dependence on chain topology

被引：74

作者：

Ye, ZB ^{[1
]}

Zhu, SP ^{[1
]}

机构：

[1] McMaster Univ, Dept Chem Engn, Hamilton, ON L8S 4L7, Canada

来源：

MACROMOLECULES | 2003年 / 36卷 / 07期

关键词：

D O I：

10.1021/ma0340053

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The rheological properties for a series of highly branched polyethylene samples prepared with a Pd-diimine catalyst system were examined. The polymers produced at low pressure (0.2 and 1 atm) and higher temperature (35°C) exhibited rheological behavior characteristic of hyperbranched polymers. The samples had very low viscosities and showed Newtonian flow behavior due to the absence of chain entanglements. The change of chain topology from hyperbranched to linear led to much higher viscosity and non-Newtonian flow behavior due to chain entanglements.

引用

页码：2194 / 2197

页数：4

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