The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropyltriethyoxysilane,was used as the carrier to support titanium chloride.XPS and FTIR measurements were emplyed t...The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropyltriethyoxysilane,was used as the carrier to support titanium chloride.XPS and FTIR measurements were emplyed to investigate the states of several atoms during stepwise supporting catalyst for clarifying the mechanism.The results showed two possible mechanisms of active catalytic sites on the composite carrier:the catalytic sites bridged through MAO on the inorganic silica gel;on contrary,the catalytic sites bridging with carbonyls of amide formed in the composite.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The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropyltriethyoxysilane,was used as the carrier to support titanium chloride.XPS and FTIR measurements were emplyed to investigate the states of several atoms during stepwise supporting catalyst for clarifying the mechanism.The results showed two possible mechanisms of active catalytic sites on the composite carrier:the catalytic sites bridged through MAO on the inorganic silica gel;on contrary,the catalytic sites bridging with carbonyls of amide formed in the composite.
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。