Olefin Polymerizations with a Highly Active MgCl2 Supported TiCl4 Catalyst System: Comparison on the Behaviors of Propylene, Butene-1 Ethylene and Styrene Polymerizations
Homopolymerizations of propylene, butene-1, ethylene and styrene were performed with a highly active MgCl2 supported TiCl4 catalyst in conjunction with Et3Al or Et3 Al and ethylbenzoate(EB). The stereospecificity of polypropylene(PP) and polybutene-1(PB-1) was remarkably enhanced by EB and not affected by polymerization time, while that of polystyrene(PSt) was affected a little with EB and significantly enhanced by polymerization time, suggesting that the nature of active centers for propylene and butene-1 monomers is more or less similar to each other, but significantly different from that for styrene monomer. In addition, a suitable amount of EB was found to increase the catalyst activity in ethylene polymerization.
KeywordsPropylene Acidity MgCl Fractionation Polystyrene
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