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首页> 外文期刊>Journal of Applied Polymer Science >Copolymerization of Ethylene and Propylene Catalyzed by Novel Magnesium Chloride Supported, Vanadium-Based Catalysts
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Copolymerization of Ethylene and Propylene Catalyzed by Novel Magnesium Chloride Supported, Vanadium-Based Catalysts

机译：新型氯化镁负载钒基催化剂催化乙烯和丙烯的共聚

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摘要

Two novel magnesium chloride supported, vanadium-based Ziegler-Natta catalysts with 9,9-bis(methoxymethyl)fluorene and di-i-butyl phthalate as internal donors were prepared and used in the copolymerization of ethylene and propylene. The catalytic behaviors of these catalysts were investigated and compared with those of traditional magnesium chloride supported, vanadium-based catalysts without internal donors. Differential scanning calorimetry, gel permeation chromatography, and C-13-NMR spectroscopy analysis were performed to characterize the melting temperatures, molecular weights, and molecular weight distributions as well as structures and compositions of the products. The copolymerization kinetic results indicated that the novel catalyst with 9,9-bis(methoxymethyl)fluorene as an internal donor had the highest catalytic activity and optimal kinetic behavior in ethylene-propylene copolymerization with an ethylene/propylene molar ratio of 44/56. Low-crystallinity and high-molecular-weight copolymers were obtained with these novel Magnesium chloride Supported, vanadium-based catalysts. The reactivity ratio data indicated that the catalytic systems had a tendency to produce random ethylene-propylene copolymers. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2625-2629, 2009
机译：制备了两种新型的氯化镁负载钒基齐格勒-纳塔催化剂，其中9,9-双（甲氧基甲基）芴和邻苯二甲酸二异丁酯作为内给体，并用于乙烯和丙烯的共聚。对这些催化剂的催化行为进行了研究，并与没有内部给体的传统氯化镁负载的钒基催化剂进行了比较。进行差示扫描量热法，凝胶渗透色谱法和C-13-NMR光谱分析以表征熔融温度，分子量和分子量分布以及产物的结构和组成。共聚动力学结果表明，以9,9-双（甲氧基甲基）芴为内给体的新型催化剂在乙烯/丙烯摩尔比为44/56的乙烯-丙烯共聚反应中具有最高的催化活性和最佳的动力学行为。用这些新型的氯化镁负载的钒基催化剂可得到低结晶度和高分子量的共聚物。反应性比率数据表明，催化体系具有产生无规乙烯-丙烯共聚物的趋势。 （C）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：2625-2629，2009

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