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TiCl_4/MgCl_2/clay compound catalyst was prepared by chemical reaction.Exfoliated polypropylene(PP)/clay nanocomposites were synthesized by in situ polymerization with this compound catalyst.Effects of polymerization temperature,polymerization time,propylene pressure,solvent consumption and pre-treat time of catalyst on catalyst activity and catalytic stereospecificity were studied.Under optimal conditions,activity of the nano-compound catalyst is about 88.3 kg/(mol Ti·h).Isotacticity of PP obtained in the nanocomposites is in the range of 89%-99%,and its melting temperature is about 159℃.The weight-average molecular weight of PP can reach 6.7×10~5 - 7.8×10~5,and the molecular weight distribution is between 7.7 and 7.9.
TiCl 4 / MgCl 2 / clay compound catalyst was prepared by chemical reaction. Exfoliated polypropylene (PP) / clay nanocomposites were synthesized by in situ polymerization with this compound catalyst. Effects of polymerization temperature, polymerization time, propylene pressure, solvent consumption and pre-treat time of catalyst on catalyst activity and catalytic stereospecificity were studied. Unitized optimal conditions, activity of the nano-compound catalyst is about 88.3 kg / (mol Ti · h) .Isotacticity of PP obtained in the nanocomposites is in the range of 89% -99 %, and its melting temperature is about 159 ° C. The weight-average molecular weight of PP can reach 6.7 × 10 ~ 5 ~ 7.8 × 10 ~ 5, and the molecular weight distribution is between 7.7 and 7.9.