Effect of silane-modified silica/MAO-supported Et[Ind]2ZrCl2 metallocene catalyst on copolymerization of ethylene

Effect of SiCl4-modified silica/MAO-supported Et[Ind]2ZrCl2 metallocene catalyst on copolymerization of ethylene with α-olefins was investigated. Effect of SiCl4 on activities was diminished with higher α-olefins. Molecular weights of copolymers decreased with SiCl4 modification. SiCl4 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 SiCl4 modification.