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A method of computation of the pressure effect on melt viscosity

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1002/pen.760251104
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Affiliation
  1. National Research Council of Canada
FormatText, Article
ConferenceThird NRCC-IMRI Mini-Symposium " Modeling 84 " - Mathematical Modeling of Plastics Processing Operations and Polymer Properties, January 24th, 1984, Montréal, Québec
Abstract
Simha's equation of state provides the relation between reduced pressure, temperature, and volume (P̃, T̃, and Ṽ, respectively) and the occupied site fraction, y = y (P̃, T̃). The latter theoretical parameter combines the P and T effects on the occupied and unoccupied (“free volume”) part of the model liquid. It can be computed for each liquid once the thermodynamic reducing parameters are known. Empirical correlation between published zero shear viscosity data, η = η (P, T), and y indicates that for n‐paraffins and molten polymers η is a single parameter function: η = η (y). The mathematical form of this dependence was explicitly given for n‐paraffins. However, for polymers the correlation depends on molecular weight, molecular weight distribution, branching, composition, etc. In Practical terms, η = η (y) should be determined for each polymer by measuring the temperature dependence of η in as wide a range of T as possible. Then pressure effect on η can be determined from η = η(y) plot, knowing the y = y(P̃, T̃) relation.
Publication date
PublisherWiley
In
  • Polymer Engineering and Science 25, no. 11: 655–668.
LanguageEnglish
Peer reviewedYes
NRC numberCNRC 22983
NRC-IGM83-138-096
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Record identifier9235803a-ccd2-4f59-bd0f-67a52c56c539
Record created2019-03-27
Record modified2020-06-03
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