An attempt to determine the concentration of active sites in supported Ziegler-Natta catalysts

By use of kinetic data of the polymerization of hexene-(1) and octene-(1) an attempt is made to determine the concentration of active sites. The complex kinetics of the supported Ziegler-Natta catalyst investigated, however, does not allow an explicit calculation of the concentration of active sites. With certain conditions met, the yield factor of active sites was determined. For the polymerization of hexene-(1) and octene-(1) the yield factors gave very low values. This is attributed to the fact that in the case of hexene-(1) and octene-(1) no disintegration of the catalyst particles was observed as is the case for ethylene polymerization.