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Formation Properties of Solid-state Extruded High Density Polyethylene Fibers by W. T. Mead; Roger S. Porter is a Materials Science article available to read on EtoBox.
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## Abstract Extrusion rates have been measured for high density polyethylene fibers prepared by solid‐state extrusion through a conical die with maximum draw ratio of 52, using constant pressure and temperatures ranging from 0.12 to 0.49 GPa and 60° to 140°C and molecular weights from 5 × 10^4^ to 6 × 10^6^. The processing variables are reported in terms of an apparent elongational viscosity. The logarithm of the extrusion rate was proportional to the applied pressure. Deviation from the Eyring theory of viscosity was found, since lowering of the extrusion temperature to 60°C produced an anomalous decrease in the extrusion rates. The anomaly was explained by the increased friction between die and polymer, the pressure dependence of the yield stress, and by the pressure dependence of the α‐relaxation mechanism. Apparent activation energies of 60 and 100 kcal/mole were calculated for the solid‐state extrusion in the region 100°–130°C and 80–100°C. Three modes of deformation were observed for each extrusion, consisting of an unsteady state, a second stage of drawing in which the extrusion rate approached a constant value, and a fracture region. The first mode corresponded to orientati
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- Author
- W. T. Mead; Roger S. Porter
- Publisher
- Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0360-8905)
- Published
- 1978
- Language
- EN
- Field
- Materials Science (Physical Sciences)