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本文通过对TiCl_3-Al(C_2H_5)_3聚合1-辛烯产物的双峰型分子量分布曲线用Schulz函数进行拟合、分峰处理,发现这种双峰型分布中的高分子量峰部分由一种活性中心生成,低分子量峰部分则由至少两种活性中心生成.将不同转化率时聚辛烯的分子量分布分峰拟合数据与聚合速率、活性中心数等测定数据相结合,得到了高分子量和低分子量两部分产物相应的活性中心上各自的动力学参数(增长速率常数、活性中心数、链转移常数等)及各自的聚合速率曲线,从而证实了多种活性中心的存在、它们催化特性的差异及与聚合物分子量分布增宽的关系.
In this paper, the bimodal molecular weight distribution curve of TiCl_3-Al (C_2H_5) _3 polymerized 1-octene was fitted by Schulz’s function and fractionated. It was found that the high molecular weight peak in this bimodal distribution consists of a Active center and low molecular weight peak are generated from at least two kinds of active centers.When the conversion rate of polyoctene molecular weight distribution peak fitting data is combined with the measured data such as polymerization rate and number of active centers to obtain high molecular weight And kinetic parameters (growth rate constants, number of active centers, chain transfer constants, etc.) and their respective polymerization rates on the corresponding active centers of the two low molecular weight products confirmed the existence of various active sites whose catalytic properties The difference and the polymer molecular weight distribution broaden the relationship.