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Determination of Mark–Houwink parameters of ethylene–norbornene copolymers and molecular characteristics estimation

✍ Scribed by Zhen Yao; Shao-jie Liu; Fei Lv; Kun Cao

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
93 KB
Volume
109
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

Ethylene–norbornene copolymers (ENC) with ∼ 50%, ∼ 25% and ∼ 15% norbornene (NB) fraction in a wide range of molecular weight were produced by metallocene catalysts. By coupling the gel permeation chromatography (GPC) with the intrinsic viscosity data in 1,2,4‐trichlorobenzene (TCB)at 150°C, the Mark–Houwink parameters of ENC were determined and compared with previous classical analysis using polyethylene's relative parameters. The results indicated that parameter K was considerably increased with decreasing NB fraction in ENC but parameter α was only increased slightly. Furthermore, the structure characteristics and correlative rheological parameters of resultant ENC were also calculated and discussed by the Stockmayer–Fixman analysis. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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