A novel half-titanocene compound

(η5-pentamethylcyclopentadienyl) titanium triallyloxide (Cp*Ti(OCH2CH=CH2)3)

and modified methylalumiloxane (mMAO) were synthesized and employed in the study on ethylene\|propylene copolymerization.The influences of the amount of residual TMA in MAO

ethylene-propylene feeding molar ratio

polymerization temperature and the concentrations of catalyst and mMAO on activity of ethylene-propylene copolymerization

molecular weight of copolymer have been discussed in detail.It was found that the catalytic activity increased with the decreasing of the amount of residual TMA in MAO

such as from 22.3% to 14.8% TMA content in MAO

resulting in the Ti(Ⅳ)species content from 40.8% up to 88.8%

which indicated that the Ti(Ⅳ) species is favorable for the ethylene-propylene copolymerization.The activity also increased with the decreasing of ethylene molar ratio in feeding comonomer

it perhaps related to the chain structure and physical state of copolymer.The catalytic activity was affected obviously by the polymeric temperature

but it was not as sensitive in higher ethylene-propylene feeding molar ratio(E/P=70:30) as that in lower E/P feeding ratio(E/P=10:90)

this performance suggested that higher temperature was more suitable for ethylene polymerization than for propylene polymerization.The varying ranges of Al/Ti=140～230mol/mol and [Ti]=1.0×10-3～1.2×10-3mol/L weght random ethylene-propylene copolymer elastomers

most of those can be soluble ni hexane

were obtained by the catalyst.