PROPERTIES OF THE ACTIVE CENTERS ON TiCl4/MgCl2 CATALYSTS FOR OLEFIN POLYMERIZATION
TiCl4/MgCl2负载型烯烃聚合催化剂活性中心性质的研究

The number of active centers of 1-octene polymerization systems catalyzed by TiCl4/Mg-Cl2-AlR3 was determined by quenching with acetyl chloride,and the effects of cocatalyst and organic electron donors on the polymerization rate,the number of active centers and the propagation rate constant were studied. Combining with the study of the polymer molecular weight distribution by a multi-peak fitting method,the presence of 3 or 4 kinds of active center with different properties was evidenced. It is found that electron donors can selectively change the properties of certain kinds of active center.