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测定了络合Ⅱ型TiCl_3-Al(C_2H_5)_3催化1-辛烯聚合中不同时间的产物分子量分布,用4个Schulz-Flory“最可几”分布函数叠加,较好地拟合了实测分布,从而确定此体系有4种活性中心。从拟合及动力学测定结果确定了4种活性中心的聚合速率、浓度及链增长速率常数、链转移速率常数等,讨论了各活性中心的结构及聚合机理。
The product molecular weight distributions at different times during the polymerization of 1-octene catalyzed by the complex type II TiCl 3 -Al (C 2 H 5) 3 were determined. The four Schulz-Flory “most probable” distribution functions were superposed to fit the measured distribution , To determine the system has 4 active centers. The polymerization rates, concentration and chain growth rate constants, chain transfer rate constants, etc. of the four active sites were determined from the results of the fitting and kinetic measurements. The structures and polymerization mechanisms of the active sites were discussed.