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Ethylene/1-hexene was copolymerized by an unbridged zirconocene, (2-PhInd)2ZrCl2/MAO (methyl aluminoxane) at 0 ℃ and 50 ℃ respectively. High copolymerization activity and 1-hexene incorporation were observed at 0 ℃, with the copolymer formed having random