Abstract
Ethylene-propylene copolymerization was carried out over MgCl2-supported TiCl4 catalyst with two different reaction schemes; i.e., stopped-flow copolymerization (SFC) and continuously-purged copolymerization (CPC). The reactivity ratios for each monomer was evaluated by Fineman-Ross and Kelen-Tudos methods. It was found that the SFC resulted in smaller value of ethylene reactivity ratio(rE) and larger value of propylene reactivity ratio(rp) than the CPC. This seems to be attributed to the different extent of interaction between catalytic titanium sites and aluminum alkyls, i.e. active site formation and its over-reduction.
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