Abstract
Effect of SiCl 4-modified silica/MAO-supported Et[Ind] 2ZrCl 2 metallocene catalyst on copolymerization of ethylene with α-olefins was investigated. Effect of SiCl 4 on activities was diminished with higher α-olefins. Molecular weights of copolymers decreased with SiCl 4 modification. SiCl 4 modification also resulted in a lower molecular weight distribution. 13C NMR showed that ethylene incorporation in all systems gave copolymers with similar triad distribution. In addition, a narrow branching distribution can be achieved with SiCl 4 modification.
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