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 ...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.展开更多
制备了一种含有胺基官能团的α-二亚胺镍配合物,并将该配合物负载在AlEt_3改性的SiO_2-MgCl_2复合载体上制备负载催化剂,不用昂贵的MAO(甲基铝氧烷)而用AlEt_2Cl作助催化剂,研究了其对乙烯的聚合性能。并采用高温^(13)CNMR、高温GPC、...制备了一种含有胺基官能团的α-二亚胺镍配合物,并将该配合物负载在AlEt_3改性的SiO_2-MgCl_2复合载体上制备负载催化剂,不用昂贵的MAO(甲基铝氧烷)而用AlEt_2Cl作助催化剂,研究了其对乙烯的聚合性能。并采用高温^(13)CNMR、高温GPC、差示扫描量热法(DSC)等对得到的聚合物进行了研究。结果发现,该催化剂具有很高的催化活性(1.89×10~6g of PE/mol of Ni h),得到的聚乙烯产品含有各种短支链(甲基、乙基、丙基、丁基)和长支链,分子量在2.15×10~5～9.27×10~5之间,分子量分布为3.12～4.23。展开更多
文摘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.
文摘制备了一种含有胺基官能团的α-二亚胺镍配合物,并将该配合物负载在AlEt_3改性的SiO_2-MgCl_2复合载体上制备负载催化剂,不用昂贵的MAO(甲基铝氧烷)而用AlEt_2Cl作助催化剂,研究了其对乙烯的聚合性能。并采用高温^(13)CNMR、高温GPC、差示扫描量热法(DSC)等对得到的聚合物进行了研究。结果发现,该催化剂具有很高的催化活性(1.89×10~6g of PE/mol of Ni h),得到的聚乙烯产品含有各种短支链(甲基、乙基、丙基、丁基)和长支链,分子量在2.15×10~5～9.27×10~5之间,分子量分布为3.12～4.23。
