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| Titel: |
Mathematical Models of Polymer Melt Viscosity in Shearing Flow 1 Polyethylene Melts |
| Auteur: |
Dodin, Mark G. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 11 (1986) nr. 2 pagina's 115-135 |
| Jaar: |
1986-01-01 |
| Inhoud: |
The dependence of polymer melt viscosity on temperature, shear rate and shear stress has been examined. The theory of absolute reaction rates and the influence of a potential gradient on the kinetics of heat-activated processes have served as the basis for this study. Experimental data on LDPE, LLDPE, HDPE and Blends have been used to derive semi-empirical equations correlating PE melt viscosity with temperature and shear rate, or temperature and shear stress. Computer calculations have been carried out to obtain the best set of constants in the equations and the correlation coefficients between the experimental and computed data for each resin and each equation. Correlation coefficients obtained are very high. Joint solution of the equations to η =f(T; γ˙) and η =F(T; τ) gives an equation γ˙=(ø;(τ; T) similar to power law equation incorporating the dependence of shear rate not only on shear stress but also on temperature. The activation energy of melt flow for various PE resins has been determined from the equations proposed for the conditions of γ˙ = const, and τ = const. The values obtained for E0γ˙, and Eτ, are in good agreement with the literature data. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 3 van 6 gevonden artikelen
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