一种新型亚胺基吡啶铁配合物和茂金属复配催化乙烯原位共聚制备LLDPE  

PREPARATION OF LLDPE FROM THE “in-situ” COPOLYMERIZATION OF ETHYLENE CATALYZED BY A NOVEL IMINOPYRIDYL IRON COMPLEX AND METALLOCENE

作　　者：黄英娟[1] 刘盘阁[1] 姬荣琴[1] 曹晨刚[1] 闫卫东[1] 胡友良[2] 

机构地区：[1]河北工业大学化工学院高分子科学与工程研究所,天津300130 [2]中国科学院化学研究所分子科学中心工程塑料国家重点实验室,北京100080

出　　处：《高分子学报》2004年第1期125-128,共4页Acta Polymerica Sinica

基　　金：国家自然科学基金 (基金号 50 2 73 0 0 9);工程塑料国家重点实验室开放基金 (基金号SKLEP0 0 62 );天津市自然科学基金重点项目 (基金号 0 2 3 80 2 2 11);河北省自然科学基金 (基金号 2 0 2 0 0 8);河北省博士基金资助项目

摘　　要：Linear low density polyethylene from ethylene as an o nly monomer was prepared by the combination catalyst system of Et(Ind) 2ZrCl 2 an d {2 [2 Me 4 Br C 6H 3NC(Me)] 2C 5H 3N}FeCl 2 activated with methy laluminoxane (MAO).The two catalysts were well matched in a single reactor and i t was observed that the “comonomer effect" appeared in the in situ copolymeriz ation of ethylene.The comonomer effect was some strongly influenced by the molar ratio of Al to (Fe+Zr) and the polymerization temperatures.At 60℃ and n(Al )/n(Fe+Zr)=2000,the maximum activity of the catalytic system(8 5×10\+6g/mo l·h) was 4\^25 times higher than that of homopolymerization of ethylene(2\^0×1 0\+6g/mol·h),and the value of n(Fe)/n(Zr) was 0 5.At n(Al)/n(F e+Zr)=1000,the maximum activity diminished.When polymerization temperatures incr eased,the maximum activity of the in situ copolymerization decreased and the co rresponding ratio of Fe to Zr also decayed.The copolymers made from this catalyt ic system had the characteristics of low melting point(from 132 34℃ to 70 97 ℃),low density(from 0 9467?g/cm\+3 to 0\^9283?g/cm\+3) and narrow molecular weight distribution(from 2\^29 to 1\^86).However,it’s no obvious influence of th e comonomer effect on the physical properties of the copolymers.Linear low density polyethylene from ethylene as an o nly monomer was prepared by the combination catalyst system of Et(Ind) 2ZrCl 2 an d {2 [2 Me 4 Br C 6H 3NC(Me)] 2C 5H 3N}FeCl 2 activated with methy laluminoxane (MAO).The two catalysts were well matched in a single reactor and i t was observed that the “comonomer effect' appeared in the in situ copolymeriz ation of ethylene.The comonomer effect was some strongly influenced by the molar ratio of Al to (Fe+Zr) and the polymerization temperatures.At 60℃ and n(Al )/n(Fe+Zr)=2000,the maximum activity of the catalytic system(8 5×10\+6g/mo l·h) was 4\^25 times higher than that of homopolymerization of ethylene(2\^0×1 0\+6g/mol·h),and the value of n(Fe)/n(Zr) was 0 5.At n(Al)/n(F e+Zr)=1000,the maximum activity diminished.When polymerization temperatures incr eased,the maximum activity of the in situ copolymerization decreased and the co rresponding ratio of Fe to Zr also decayed.The copolymers made from this catalyt ic system had the characteristics of low melting point(from 132 34℃ to 70 97 ℃),low density(from 0 9467?g/cm\+3 to 0\^9283?g/cm\+3) and narrow molecular weight distribution(from 2\^29 to 1\^86).However,it's no obvious influence of th e comonomer effect on the physical properties of the copolymers.

关 键 词：亚胺基吡啶铁配合物 茂金属 复配催化剂 乙烯原位共聚 短支链线性低密度聚乙烯 LLDPE 共单体效应 

分 类 号：O631[理学—高分子化学]