Ansa-茂锆催化剂对乙烯/1-辛烯共聚合研究

COPOLYMERIZATION OF ETHYLENE/1 OCTENE WITH ANSA ZIRCONOCENE CATALYSTS

乙烯与α烯烃共聚合可制得线性低密度聚乙烯等重要塑料产品．用茂金属催化剂与甲基铝氧烷（ＭＡＯ）助催化剂合成的乙烯／α烯烃共聚物具有共单体分布均匀，分子量分布窄等特点，其性能比传统的ＺｉｅｇｌｅｒＮａｔａ催化剂体系所得共聚物优越．茂金属化合物的结构...

Copolymerization of ethylene/1 octene with three ansa zirconocene/MAO catalyst systems were investigated. The polymerization activity is dependent upon the influence of electronic effects. It decreases in the following order: C 6H 4(CH 2) 2Cp 2ZrCl 2> C 5H 3N(CH 2) 2Cp 2ZrCl 2 > CH 3N(CH 2) 2ZrCl 2. The composition and sequence distribution of copolymer were calculated from 13 C NMR spectra. It was found that the activityes of three ansacatalysts were lower than Et(Ind) 2ZrCl 2 under the same 1 octeone concentration. And their copolymer had lower 1 octene incorporation than that of Et(Ind) 2ZrCl 2. Other properties such as molecular wieght, melting point of copolymer were compared.