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The rheological properties of metallocene-catalysed linear polyethylenes and those of blends prepared with ethylene-vinyl acetate copolymers were evaluated. The pure polyethylenes showed characteristic features of linear polymers in the melt state, but poor processability, as would be expected for materials of narrow molecular weight distribution. The characteristic sharkskin and slip-stick regimes...
This study was designed to determine the linear viscoelastic properties of a family of metallocene-catalysed propylene homopolymers in the 'plateau' and terminal regions. A low value of the plateau modulus, around 4.8x10 5 Pa, was obtained. Our results differ from those reported for conventional amorphous polypropylene in several recent studies. As previously undertaken for metallocene-catalysed...
In this article, the linear viscoelastic properties of a family of metallocene-catalysed ethylene homopolymers and ethylene/1-hexene copolymers near the 'plateau' and in the terminal regions have been measured. The zero shear viscosity and relaxation time both scale to 3.41 power of the molecular weight, as is observed for most of the linear polymers. At the same time, no rheological signs associated...
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