✦ LIBER ✦

Effect of homogeneity on viscosity in capillary extrusion of polyethylene

✍ Scribed by R. F. Heitmiller; R. Z. Naar; H. H. Zabusky

Publisher: John Wiley and Sons
Year: 1964
Tongue: English
Weight: 388 KB
Volume: 8
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1964.070080226

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✦ Synopsis

The change in melt flow properties, as determined by melt index measurement, as a function of shear history, has been measured for linear polyethylene. It is shown that a drop in melt index occurs when a polymer sample which has had no previous shear history is melted and subjected to shear mixing. This fact is attributed to a molecular homogenization of a previously unmixed blend. An analytical model of the laminar flow in a pipe of concentric adjacent fluids with different viscosities is presented. The model indicates that the effective viscosity of this non-homogeneous system is much lower than the viscosity of an intimate blend of the same viscosity fluids.

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