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.
KeywordsCatalyst System Methyl Ethyl Ketone Polymerization Condition Ethylene Polymerization Styrene Polymerization
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- 1).Kashiwa N, Kawasaki M, Yoshitake J (1986) Catalytic Polymerization of Olefins, Kodansha and Elsevier, Tokyo, p43Google Scholar
- 3).Soga K, Sano T, Ohnishi R (1981) Polym. Bull. 4: 157Google Scholar
- 4).Soga K, Chen S.I, Ohnishi R (1983) Ibid 10: 168Google Scholar
- 6).Schindler A (1968) Ibid 118: 1Google Scholar
- 7).Natta G, Pino P, Mazzanti G, Longi P (1957) Gazz. Chim. It. 87: 549Google Scholar
- 8).Natta G, Pino P, Mazzanti G, Longi P (1957) Ibid 87: 570Google Scholar
- 9).Kashiwa N, Yoshitake J (1984) Polym. Bull. 12: 99Google Scholar