战术性
催化作用
立体专一性
摩尔质量分布
聚合
高分子化学
齐格勒-纳塔催化剂
材料科学
配位聚合
熔体流动指数
化学
有机化学
聚合物
溶液聚合
共聚物
作者
Tao Jiang,Wei Chen,Feng Zhao,Yue-Xiang Liu
摘要
A novel MgCl2-supported Ziegler-Natta catalyst containing diethyl diisopropylsuccinate donor was prepared and propylene polymerizations with the combination of such catalyst and four external donors were investigated in detail. The catalyst was compared with a commercial one with phthalate as internal donor in terms of catalytic activity, hydrogen sensitivity and stereospecificity in propylene polymerization. The molecular weight, molecular weight distribution and microstructure of the produced polypropylenes were compared also. It was found that the novel catalyst containing succinate internal donor showed higher activity and higher stereospecificity than those with phthalate as internal donor. Consequently, polypropylenes obtained by the succinate-based catalyst showed high molecular weight, high melting temperature, high isotactic index and broad molecular weight distribution than those obtained with the commercial catalyst.
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