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以SiO2为载体,制备了负载的双核茂金属[(η5-C5H5)Zr Cl2]2[μ,μ-(SiMe2)2(η5-allyl C5H2)2]/MAO/SiO2催化剂,以己烷为溶剂进行了淤浆条件下乙烯聚合反应,研究了扩散因素、乙烯聚合压力和聚合温度对乙烯淤浆聚合动力学参数的影响,测定了聚合反应级数和表观活化能,采用动力学和相对分子质量法计算了负载催化剂的活性中心浓度,并对链增长速率常数等动力学参数进行了计算.结果表明,以负载双核茂金属催化剂催化乙烯淤浆聚合反应速率对单体浓度呈1.11级依赖,反应活化能Ea为72.47 kJ/mol,活性中心浓度C*为0.33 mol/mol,链增长速率常数Kp为1.06×106L.(mol.h)-1.
The supported binuclear metallocene [(η5-C5H5) Zr Cl2] 2 [μ, μ- (SiMe2) 2 (η5-allyl C5H2) 2] / MAO / The effects of diffusion factors, ethylene polymerization pressure and polymerization temperature on the polymerization kinetics parameters of ethylene slurry were investigated. The polymerization reaction order and apparent activation energy were measured. The kinetics and relative molecular weight Mass method was used to calculate the concentration of active sites on supported catalysts and the kinetic parameters such as chain growth rate constants were calculated.The results showed that the rate of ethylene polymerization catalyzed by binuclear metallocene catalyst was 1.11 level dependent on monomer concentration, The activation energy Ea was 72.47 kJ / mol, the active site concentration C * was 0.33 mol / mol and the chain growth rate constant Kp was 1.06 × 106 L. (mol.h) -1.