后过渡金属铁系催化剂与Et[Ind]_2ZrCl_2复配催化乙烯原位共聚中的“共单体效应”  

Comonomer Effect of the in - Situ Copolymerization of Ethylene Catalyzed by {2 - [2 - MeC_6H_4N = C(Me) ]_2C_5H_3N} FeCl2/Et(Ind)_2ZrCl_2 Activated with Methylaluminoxane

作　　者：黄英娟[1] 刘盘阁[2] 曹晨刚[1] 李贺新[1] 闫卫东[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：《石油化工》2003年第11期953-956,共4页Petrochemical Technology

基　　金：国家自然科学基金(50273009);工程塑料国家重点实验室开放基金(SKLEP0062)资助;天津市自然科学基金重点项目(023802211);河北省自然科学基金(202008)资助;河北省博士基金资助。

摘　　要：研究了以{2-[2-MeC6H4N=C(Me)]2C5H3N}FeCl2为齐聚催化剂、以Et[Ind]2ZrCl2为共聚催化剂复配,在甲基铝氧烷作用下催化乙烯原位共聚的“共单体效应”。在n(Al)/n(Zr)、n(Al)/n(Fe)和n(Al)/n(Fe+Zr)分别为2000时,改变齐聚催化剂/共聚催化剂的配比,均观察到共单体效应。探讨了助催化剂用量、主催化剂用量和聚合温度对共单体效应的影响。助催化剂用量的增加使出现最佳活性点的n(Fe)/n(Zr)发生了前移,而主催化剂用量的增加使出现最佳活性点的n(Fe)/n(Zr)发生了后移。聚合温度的改变使共单体效应的变化规律发生了改变。Linear low density polyethylene from ethylene as only monomer was prepared by the combined catalyst system of Et ( Ind)2ZrCl2 and {2 - [2 - MeC6H4N = C (Me)]2C5H3N } FeCl2 activated with methylaluminoxane( MAO). Details of the comonomer effect based on combinations of two kinds of single site catalysts were discussed. Comonomer effects were observed in all three cases: n (Al) /n (Zr) = 2000, n (Al) / n(Fe)=2000 and n(Al)/w(Fe+ Zr) =2000. High activity of 7.2 × 106 g/(mol·h) ,5.6 × 106 g/(mol·h) and 6.2× 106 g/(mol·h) respectively appeared as compared with activity of 2.0 × 106 g/(mol·h) of ethylene homo - polymerization under the same conditions. Optimum mole ratio of Fe / Zr increased as co - catalyst decreased or catalysts increased. Values of n (Fe)/n (Zr) also varied with temperatures. Crystallinity and melting temperature of product lowered with incorporation of a - olefins. However, they decreased slowly with the increment of α-olefin when values of n(Fe)/n(Zr) were above 0.5.

关 键 词：共单体效应 原位共聚 亚胺基吡啶铁配合物 茂金属 线性低密度聚乙烯 乙烯 

分 类 号：TQ314[化学工程—高聚物工业]