Citation: . A RHEOLOGICAL MODEL FOR POLYMER MELTS WITH INTERNAL STRUCTURE IN FLOW FIELDS*[J]. Chinese Journal of Polymer Science, ;1999, 17(2): 151-158. shu

A RHEOLOGICAL MODEL FOR POLYMER MELTS WITH INTERNAL STRUCTURE IN FLOW FIELDS*

Received Date: 3 December 1997

Conceptually, an imagined conformation ellipsoid is supposed to represent the shape of a polymerchain for polymer melts in flow fields and to be equivalent to the volume element in a mathematical sense incontinuum mechanics. A power law dependence of shear modulus of polymer melts on detC, referred to asenvelope volume, is proposed. Based on those assumptions and the non-linear relation of shear modulus, aphenomenological viscoelastic model is derived. The model is tested in simple shear flow, simple elongational flow,oscillatory shear flow,and relaxation process after flow suddenly stopped.The results show that the model works well to predict the change of internal structure and viscoelastic performance of polymer melts in flow fields.
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