SYNOPSISHomo-and copolymerization of ethylene were performed by using a catalyst system composedof TiC1,/THF/MgC12 complex activated with A1Et3 at 70°C and 3 atm. T o investigate the effect of the compositional difference of the catalyst on the rates of homo-and copolymerization and on the reactivity in ethylene-hexene copolymerization, a series of six catalysts with different compositions ( Mg/Ti = 0.4-16.5) were prepared by coprecipitation. The catalytic activity in ethylene polymerization increased sharply with the Mg/Ti ratio from 21 (Mg/Ti = 0.4) to 1477 kg PE/g-Ti h (Mg/Ti = 16.5). The activity in copolymerization with 1-hexene also increased with Mg/Ti ratio. The values of rl were 120, regardless of Mg/Ti ratios within the experimental error range. Enhancement of the polymerization rate by the addition of l-hexene in the reaction medium was observed only for the catalysts of low Mg/Ti ratio. This unusual effect of 1-hexene on the polymerization rate was explained by chemical and physical processes that occurred during polymerization.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.