Synthesis of Branched Polyethylene by Ethylene Homopolymerization with Novel Mono-titanocene Catalysts

Abstract

Abstract: Branched polyethylene was synthesized by ethylene homopolymerization in the presence of a novel metallocene complex of η⁵-pentamethylcyclopentadienyl tribenzyloxy titanium[Cp^*Ti(OBz)₃] activated by four types of modified methylaluminoxanes(mMAO) which contained different amounts of residual trimethylaluminum(TMA). The activity of catalyst and molecular weight, branched degree and branch length of the resultant polymers depend on the oxidation states of active species of titanium and polymerization temperature. The higher content(%) of residual TMAin mMAOcould strongly reduce complexes Ti(Ⅳ) to Ti(Ⅲ) and Ti(Ⅱ) and Ti(Ⅳ) active species was suggested to be more effective for ethylene polymerization. The products obtained were confirmed by ¹³C NMRand IRspectra charac-terization to be branched polyethylene with isolated long branch and methyl pendant. There is a remar-kable increase in proportion of methyl pendant with the increase of polymerization temperature.

Key words: Titanocene, Methylaluminoxane, Polyethylene, Branched polyethylene

CLC Number:

O631

TrendMD:

ZHU Fang-Ming, FANG Yu-Tang, CEHN Han-Bin, LIN Shang-An . Synthesis of Branched Polyethylene by Ethylene Homopolymerization with Novel Mono-titanocene Catalysts[J]. Chem. J. Chinese Universities, 2000, 21(10): 1607.

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Synthesis of Branched Polyethylene by Ethylene Homopolymerization with Novel Mono-titanocene Catalysts

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