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A method of computation of the pressure effect on melt viscosity

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DOITrouver le DOI : https://doi.org/10.1002/pen.760251104
AuteurRechercher : 1
Affiliation
  1. Conseil national de recherches Canada
FormatTexte, Article
ConférenceThird NRCC-IMRI Mini-Symposium " Modeling 84 " - Mathematical Modeling of Plastics Processing Operations and Polymer Properties, January 24th, 1984, Montréal, Québec
Résumé
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.
Date de publication
Maison d’éditionWiley
Dans
  • Polymer Engineering and Science 25, nº 11 : 655–668.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCCNRC 22983
NRC-IGM83-138-096
Exporter la noticeExporter en format RIS
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Identificateur de l’enregistrement9235803a-ccd2-4f59-bd0f-67a52c56c539
Enregistrement créé2019-03-27
Enregistrement modifié2020-06-03

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