Terpolymerization of Ethylene/Propylene/5-Ethylidene-2-Norbornene Using rac-Et(Ind)(2)ZrCl2 and Modified-Methylaluminoxane Metallocene Catalyst System | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

4868206

Reference Type

Journal Article

Title

Terpolymerization of Ethylene/Propylene/5-Ethylidene-2-Norbornene Using rac-Et(Ind)(2)ZrCl2 and Modified-Methylaluminoxane Metallocene Catalyst System

Author(s)

Huang, Yao; Fu, Z; Gu, X; Feng, L; Fan, Z

Year

2013

Is Peer Reviewed?

Yes

Journal

Journal of Polymer Materials
ISSN: 0970-0838

Volume

Issue

Page Numbers

145-157

Web of Science Id

WOS:000328802600002

Abstract

In this paper, terpolymerizations of ethylene, propylene and 5-ethylidene-2-norbornene (ENB) were carried out with rac-Et(Ind)(2)ZrCl2/modified-methylaluminiumoxane (MMAO) in n-heptane. Continuous gas feeding method was employed. The rac-Et(Ind)(2)ZrCl2/MMAO catalyst system exhibited very high terpolymerization activity (4.2x10(4) kg.mol(-1) (Zr).h(-1)) at Al/Zr < 1000. The effect of polymerization pressure, [rac-Et(Ind)(2)ZrCl2], [ENB] and ethylene/propylene feed ratio on the terpolymerizations were studied. Terpolymers containing 51 similar to 71 wt% of ethylene units and 0.4 similar to 2.1 wt% of ENB units were produced. The comonomer composition of terpolymers was about the same as the feed composition in the range from ethylene/propylene = 50/50 to ethylene/propylene = 70/30. The triads distribution of some terpolymers made in this work was similar to that of commercialized EPDM.

Keywords

Metallocene catalyst; Olefin terpolymerization; EPDM terpolymer; Modified methylaluminoxane