Abstract
An exposition is given of results, as obtained with the aid of Doi's sliplink model, being considered as the most simple version of the famous “reptation model”. It turns out that this model which exhibits three distinct phases of relaxation (an extremely fast phase, an equilibration phase and a slow disengagement phase) is capable of explaining several peculiar features of polymer melt rheology:
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a)
The molecular mass dependence of the breadth of the rubber plateau in the storage modulus, of the zero-shear viscosity and of the normal-stress coefficients.
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b)
The molecular mass independence of the equilibrium (shear and tensile) compliances for monodisperse polymers (semi-quantitative prediction).
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c)
The seemingly contradictory sensitivity of these compliances for the breadth of the molecular mass distribution.
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d)
The critical value of the shear stress at which melt fracture occurs in capillary flow.
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e)
An equilibration phase in tensile experiments on unvolcanized rubber.
In this evaluation optical (flow birefringence) measurements are preferentially used.
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Janeschitz-Kriegl, H. Some pending problems in polymer melt rheology, as seen from the point of view of Doi's slip-link model. Rheol Acta 21, 388–393 (1982). https://doi.org/10.1007/BF01534298
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DOI: https://doi.org/10.1007/BF01534298