关键词: 硅桥联茂金属, 聚合, 1-癸烯, 量热反应仪

Abstract: Polymerization of 1-decene catalyzed by silicon-bridged metallocene catalyst system rac-Me2Si(1-Ind)2ZrCl2/Al(i-Bu)3/[Me2NHPh]+[B(C6F5)4]- was studied. The effects of the concentration of metallocene catalyst, molar ratio of Al to Zr, molar ratio of boron (B) to Zr, reaction temperature and reaction time on polymer properties were investigated. The results show that at molar ratio of Zr to 1-decene 4×10-5, molar ratio of Al to Zr 80, molar ratio of B to Zr 1.2, reaction temperature 80 ℃and reaction time 1 h, the conversion of 1-decene reaches 97.6% and the kinematic viscosity (100 ℃) is 599.4 mm2/s, the viscosity index(VI) is 285, the number-average molecular weight (Mn) is 12 608, and the molecular weight distribution is 1.87. Meanwhile, we analyzed the different performances of ethenylidene-bridged metallocene catalyst system (rac-Et(1-Ind)2ZrCl2/Al(i-Bu)3/[Me2NHPh]+[B(C6F5)4]-) and rac-Me2Si(1-Ind)2ZrCl2/Al(i-Bu)3/[Me2NHPh]+[B(C6F5)4]- in terms of catalytic polymerization of 1-decene based on polymerization mechanism and catalyst micro configurations. The results both from the activity of catalyst and from the product molecular weight indicate that the silicon-bridged metallocene catalyst system is better. Finally, automatic reaction calorimeter was used to analyze the reaction under scale–up conditions, and found that the polymerization reaction heat is 61. 8 kJ/mol.

Key words: silicon-bridged metallocene, polymerization, 1-decene, reaction calorimeter