Effect of 1-hexene comonomer on polyethylene particle growth and copolymer chemical composition distribution

M. Smit, X. Zheng, R. Bruell, J. Loos, J.C. Chadwick, C.E. Koning

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Abstract

An investigation of the polymer particle growth characteristics and polymer molecular weight and composition distributions in ethylene homopolymerization and ethylene/1-hexene copolymerization has been carried out with a catalyst comprising a zirconocene and methylaluminoxane immobilized on a silica support. The presence of 1-hexene leads to higher productivity and easier fragmentation of the support during particle growth. Crystallization analysis fractionation and gel permeation chromatography analysis of ethylene/1-hexene copolymers prepared at different polymerization times reveals a broadening of the chemical composition distribution with increasing polymerization time as a result of the gradual formation of a relatively high-molecular-weight, ethylene-rich fraction. The results are indicative of significant monomer diffusion effects in both homopolymerization and copolymerization. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 2883-2890, 2006
Original languageEnglish
Pages (from-to)2883-2890
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume44
Issue number9
DOIs
Publication statusPublished - 2006

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