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The supported catalysts for propylene polymerization were prepared by milling Mg （OEt）

2

with EB （ethylbenzoate） and treating with TiCl

4

solution. When TiCl

4

/（Mg（OEt）

2

/EB） （mol.） ratio was increased

decrease in contents of-OEt and Ti of the catalysts was observed

while the content of EB increased. It is proved by analyses of IR

X-ray and XPS that during co-milling Mg（OEt）

2

with EB no reactions have taken place. But after treatment with TiCl

4

solution

Mg（OEt）

2

converts into MgCl

2

and EB coordinates on the resulting MgCl

2

carrier

a surface complex forms.The activity of catalysts

isotacticity and vicosimetric molecular weight of polypropylene increase with the decrease of the content of ethoxyl group. The kinetic curves of propene polymerization obtained with present catalysts system display decay curves. It is found from the triad tacticity calculated from the expanded spectra of methyl carbon region that

ethoxyl group in catalyst has an effect on the configuration of polymer chain.