Abstract
The activity enhancement effect of hydrogen in propylene polymerization with a MgCl 2-supported Ziegler catalyst was studied by using the stopped-flow polymerization method, by which a reaction can be conducted within an extremely short period (ca. 0.1 s). Kinetic study using this method suggested that the hydrogen did not affect the propagation rate constant and did not lead to the formation of new active sites. The results of the stopped-flow polymerization with a pre-treated catalyst indicated that activity enhancement by hydrogen did not take place in the region, under which hydrogen acts as a chain transfer agent and the reduction of the titanium species is believed to occur to produce dead sites. Slurry polymerization with prolonged polymerization time indicated that hydrogen affected both chain transfer reaction and activity enhancement, which may be due to the reactivation of the dormant sites by hydrogen.
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