Copolymerization of ethylene with cycloolefins or cyclodiolefins by a constrained-geometry catalyst

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Abstract

The copolymerization of ethylene and cycloolefins [cyclopentene (CPE), cyclohexene (CHX), cycloheptene (CHP), cyclooctene (COT), cyclododecene (CDO), norbornene (NB), and 5,6-dihydrodicyclopentadiene HDCPD] and cyclodiolefins [1,3-cyclopentadiene (CPD), 1,4-cyclohexadiene (CHD), 1,5-cyclooctadiene (COD), 2,5-norbornadiene (NBD), and dicyclopentadiene (DCPD)] was investigated with a constrained-geometry catalyst, dimethylsilylene(tetramethylcyclopentadienyl)(N- tert-butyl)titanium dichloride, with methyl isobutyl aluminoxane as a cocatalyst. In the copolymerization with cycloolefins, the olefins, except for CHX, CDO, and HDCPD, were copolymerized via the 1,2-insertion mode with the following reactivity: NB > CHP > COT > CPE. In the copolymerization with cyclodiolefins, corresponding copolymers, except for copolymerization with CHD, were obtained. A crosslinking fraction was detected in the copolymers with COD and NBD. The reactivity of the cyclodiolefins, except for COD, was higher than that of the cycloolefins. CPD was copolymerized via 1,2-insertion, 1,4-insertion or 1,2-insertion of dimerized DCPD. The copolymerization with COD showed peculiar behavior under the copolymerization condition of a high COD concentration in the feed.

Original languageEnglish
Pages (from-to)1285-1291
Number of pages7
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume43
Issue number6
DOIs
Publication statusPublished - 2005 Mar 15
Externally publishedYes

Keywords

  • Constrained-geometry catalyst
  • Copolymerization
  • Cyclodiolefin
  • Cycloolefin
  • Ethylene
  • Polyolefins
  • Ziegler-Natta polymerization

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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