The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropyltriethyoxysilane,was used as the carrier to support titanium chloride.XPS and FTIR measurements were emplyed t...The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropyltriethyoxysilane,was used as the carrier to support titanium chloride.XPS and FTIR measurements were emplyed to investigate the states of several atoms during stepwise supporting catalyst for clarifying the mechanism.The results showed two possible mechanisms of active catalytic sites on the composite carrier:the catalytic sites bridged through MAO on the inorganic silica gel;on contrary,the catalytic sites bridging with carbonyls of amide formed in the composite.展开更多
The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropytriethyoxysilane,was used as the carrier to support titanium chloride for forming polymerization catalyst.Scann...The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropytriethyoxysilane,was used as the carrier to support titanium chloride for forming polymerization catalyst.Scanning electron microscope investigated the morphology of support,supported catalysts and polyethylene particles.The results indicated:silica and polymers have been combined closely,a little silica outside of the polymer net,however;under the proper conditions,the particles of polyethylene had a good replicability for catalysts morphology.展开更多
文摘The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropyltriethyoxysilane,was used as the carrier to support titanium chloride.XPS and FTIR measurements were emplyed to investigate the states of several atoms during stepwise supporting catalyst for clarifying the mechanism.The results showed two possible mechanisms of active catalytic sites on the composite carrier:the catalytic sites bridged through MAO on the inorganic silica gel;on contrary,the catalytic sites bridging with carbonyls of amide formed in the composite.
文摘The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropytriethyoxysilane,was used as the carrier to support titanium chloride for forming polymerization catalyst.Scanning electron microscope investigated the morphology of support,supported catalysts and polyethylene particles.The results indicated:silica and polymers have been combined closely,a little silica outside of the polymer net,however;under the proper conditions,the particles of polyethylene had a good replicability for catalysts morphology.
