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首页> 外文期刊>journal of applied polymer science >Comonomer enhancement effect of 1‐hexene in ethylene copolymerization catalyzed over MgCl2/THF/TiCl4catalysts
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Comonomer enhancement effect of 1‐hexene in ethylene copolymerization catalyzed over MgCl2/THF/TiCl4catalysts

机译：Comonomer enhancement effect of 1‐hexene in ethylene copolymerization catalyzed over MgCl2/THF/TiCl4catalysts

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AbstractHomo‐ and copolymerization of ethylene were performed by using a catalyst system composed of TiCl4/THF/MgCl2complex activated with AlEt3at 70°C and 3 atm. To 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 ofr1were 120, regardless of Mg/Ti ratios within the experimental error range. Enhancement of the polymerization rate by the addition of 1‐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. © 1993 Joh

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