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分别在亚乙基双 (茚基 )二胺化铪茂 (简称 1)和异亚丙基 (环戊二烯基 ) (1-芴基 )二甲基锆茂 (简称 2 )催化作用下 ,对乙烯 (E)与 1-己烯 (H)无规共聚合进行了研究。结果表明 ,在单体浓度比 [H]/ [E]较小时共聚合速率随单体浓度比增加而增加 ,进一步增加单体浓度比则导致共聚合速率降低。催化体系 1/ Al(i Bu) 2 H/ [Ph3C][B(C6 F5 ) 4](3)催化共聚活性比 2 / MAO高得多。两单体竞聚率乘积 (r E× r H)小于 1,表明聚合物为无规共聚物。两催化体系共聚合能力相当。 DSC分析显示 ,共聚物具有较宽的熔融峰 ,甚至出现双熔点。与催化体系 2 / MAO相比 ,1 /Al(i Bu) 2 H/3催化共聚物具有更高的分子量和更宽的密度变化范围
Under the catalysis of ethylene bis (indenyl) hafnocene (abbreviation 1) and isopropylidene (cyclopentadienyl) (1-fluorenyl) dimethyl zirconocene (abbreviation 2) The random copolymerization of ethylene (E) with 1-hexene (H) was studied. The results showed that the copolymerization rate increased with the increase of the monomer concentration ratio when the monomer concentration ratio was smaller than [H] / [E], and further increase of the monomer concentration ratio resulted in the decrease of the copolymerization rate. The catalytic system 1 / Al (i Bu) 2 H / [Ph3C] [B (C6 F5) 4] (3) has much higher catalytic copolymerization activity than 2 / MAO. The product of the two monomer reactivity ratios (r E × r H) is less than 1, indicating that the polymer is a random copolymer. Two catalysis system copolymerization capacity quite. DSC analysis showed that the copolymer had a wide melting peak and even a double melting point. The 1 / Al (i Bu) 2 H / 3 catalytic copolymer has a higher molecular weight and a wider range of density changes than the catalytic system 2 / MAO