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- W2520464071 abstract "The rheological properties of the polyethenes produced with metallocene catalysts Et[Ind] 2 ZrCl 2 /MAO and (n-butCp) 2 ZrCl 2 /MAO were evaluated by dynamic viscoelastic measurements. The polymers produced with Et[Ind] 2 ZrCl 2 /MAO showed enhanced frequency dependency and elasticity at low shear rates when compared to linear, relatively narrow MWD polyethene. These polymers also exhibited elevated flow activation energy. We propose that these rheological properties resulted from in situ copolymerization of ethene and vinyl ended polyethene macromonomers and the polymers produced are thus long chain branched. The rheological properties of the produced polyethenes were able to be modified by opting for polymerization conditions. Important polymerization parameters affecting the viscoelastic behaviour came from partial pressures of ethene and hydrogen." @default.
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- W2520464071 date "1998-01-01" @default.
- W2520464071 modified "2023-09-28" @default.
- W2520464071 title "Metallocene catalyzed polyethenes with improved rheological properties" @default.
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