Abstract
AbstractThe effect of hydrogen on the chain transfer reaction in the initial stage of propene polymerization with MgCl2‐supported Ziegler catalyst was studied through H2‐D2 exchange reaction using the stopped‐flow method. When the exchange reaction was carried out with various catalyst components at room temperature for 5 min, HD was produced only in case of using the catalyst with Al(C2H5)3. In case of the stopped‐flow method (reaction time ca. 0.1 s), the catalyst without pre‐treatment with Al(C2H5)3 showed no activity for the H2‐D2 exchange reaction (no HD produced), while the catalyst with pre‐treatment had exchange activity. As the chain transfer activity of H2 in propene polymerization shows the same tendency, it is evident that chain transfer with H2 occurs via atomic hydrogen generated on the pre‐treated catalyst.
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