摘要
以反应法制备了TiCl4、乙酰丙酮改性的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 CH3COCH2 COCH3 Co(acac) 2 SiO2 MgCl2 ) ,以烷基铝作为助催化剂 ,以单一乙烯单体制备了支化聚乙烯 .研究了复合催化剂的组成、烷基铝种类和聚合反应温度等对聚合反应和产物结构性能的影响 .探讨了聚合反应机理 .聚合产物经IR、1 3 C NMR谱分析 ,结果表明Ti Co复合催化剂具有低聚原位共聚功能 ,可制得含有丁基、戊基、己基等各类支链结构的支化聚乙烯 .
The novel catalysts of TiCl4-CHCOCHCOCH3-Co(acac)(2) supported on SiO2-MgCl2 carrier(Ti-Co complex catalyst) were prepared by reaction procedure. The polyethylene with various branching chains was synthesized by using these Ti-Co complex catalysts. The effects of the kinds of AIR, polymerization temperation and the constituent of catalysts on the polymerization activity and the product properties were investigated. The polymerized products have analyzed by using IR and C-13-NMR spectroscopies. The results of C-13-NMR studies suggested that the polyethylene products contained n-butyl branches, pentyl branches and long branching chains (n greater than or equal to6). The polymerization mechanism was discussed also. Experimental results showed that, the Ti-Co complex catalyst with Et2AlCl as cocatalyst exhibited high catalytic activity and excellent properties of oligomerization and in situ copolymerization for ethylene.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2003年第3期403-408,共6页
Acta Polymerica Sinica
基金
国家自然科学基金 (基金号 2 98740 39)
广东省基金 (基金号 0 0 12 80 )资助项目
