Comparative investigations of surface instabilities ("sharkskin") of a linear and a long-chain branched polyethylene

Details Comparative investigations of surface instabilities ("sharkskin") of a linear and a long-chain branched polyethylene Comparative investigations of surface instabilities ("sharkskin") of a linear and a long-chain branched polyethylene

2010-01-15

arxiv.org/abs/1001.2619v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

An experimental study of the physical origin and the mechanisms of the sharkskin instability is presented. Extrusion flows through a slit die are studied for two materials: a linear low density polyethylene (LLDPE) and a low density polyethylene (LDPE). By combining laser-Doppler velocimetry (LDV) with rheological measurements in both uniaxial extension and shear, the distributions of tensile and shear stresses in extrusion flows are measured for both materials.

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