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- W2014393906 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 macromonomers of α-olefin produced through β-hydride elimination reaction. The presence of methyl pendant in the main chain of polyethylene implied in-situ 2,1-insertion of the macromonomers to [TiIV]−H active species following by β-hydride elimination. The polyethylene resulted with density in the range 0.898−0.947 g/cm3, and the melting temperature of 116.5−139.8 °C is in accord with the degree of branching from 25.0 to 6.9 branch numbers of 1000 carbon atoms in the polymer main chain." @default.
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- W2014393906 date "2000-06-13" @default.
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- W2014393906 title "Synthesis and Characterization of Branched Polyethylene by Ethylene Homopolymerization with Monotitanocene and Modified Methylaluminoxane Catalysts" @default.
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- W2014393906 doi "https://doi.org/10.1021/ma000229z" @default.
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