Abstract
Branched polyethylene was synthesized in the presence of a monotitanocene complex of η5-pentamethylcyclopentadienyltribenzyloxytitanium [Cp*Ti(OBz)3] activated by five kinds of modified methylaluminoxanes (mMAO) which contained different amounts of residual trimethylaluminum (TMA). The oxidation states of titanium active species in Cp*Ti(OBz)3/mMAO catalytic systems were determined by the redox titration method. The results showed that Ti(IV) active species were more beneficial for ethylene polymerization. Influences of polymerization temperature and Al/Ti molar ratio on catalytic activity, degree of branching, and molecular weight of polyethylene were investigated. The resultant products obtained were confirmed by GPC, 13C NMR, and IR characterization to be high molecular weight polyethylene with isolated long branched chain (longer than six carbons in length) and methyl pendant groups. The branched chain polyethylene is formed mainly by in-situ copolymerization of ethylene growing chain with macromonome...
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