用双过渡金属复合催化剂制备长链支化聚乙烯  

Preparation of Long-Branching Chain Polyethylene Using Double Transition Metal TiCl_ 4-Co(acac)_ 2 Combined Catalyst

作　　者：张启兴[1] 范新刚[1] 胡明鹏[1] 王海华[1] 

机构地区：[1]中山大学化学与化学工程学院高分子研究所,广州510275

出　　处：《应用化学》2003年第9期888-892,共5页Chinese Journal of Applied Chemistry

基　　金：广东省自然科学基金资助项目 ( 0 0 12 80 )

摘　　要：制备了以TiCl4,乙酰丙酮 (acac)改性的TiCl4和Co(acac) 2 为主催化剂 ,SiO2 MgCl2 为载体的复合负载型催化剂 (TiCl4 Co(acac) 2 /SiO2 MgCl2 ,TiCl4 acac/SiO2 MgCl2 和TiCl4 acac Co(acac) 2 /SiO2 MgCl2 ) ,并以所制得的催化剂催化乙烯合成了支化聚乙烯。IR、DSC、13 CNMR分析表明 ,聚合产物具有低熔点、低结晶度和高支化度 ,其己基以上长支链含量达 5 5 0 %以上。实验结果表明 ,Ti Co复合催化剂具有齐聚原位共聚性能。The novel catalysts of TiCl 4-acac-Co(acac) 2, TiCl 4-Co(acac) 2 and TiCl 4-acac supported on SiO 2-MgCl 2 carrier(Ti-Co combined catalyst) were prepared. They catalyze polymerimerization of ethylene giving branched polyethylene when Et 2AlCl was used as a cocatalyst. The polymerization products have low melting point, low crystallinity and high degree of branching as evaluated by FTIR, DSC and 13C NMR spectrum. The results of 13C NMR suggested more than 55.0% of the polyethylene contain long branch chain(n≥6). Experimental results showed that the Ti-Co combined catalyst exhibites an excellent catalytic property for oligomerization and in situ copolymerization of ethylene.

关 键 词：复合催化剂 乙烯聚合 支化聚乙烯 原位共聚合 

分 类 号：O632.12[理学—高分子化学]