EFFECT OF BLEND RHEOLOGY ON INTERFACIAL NORMALSTRESSES IN MULTI-LAYER MELT-COEXTRUSION

摘要

This simulation-study of melt-coextrusion, involving a blend layer, investigates the relationshipsrnbetween interfacial melt stresses during coextrusion and the blend microstructural relaxation.rnModel blend rheologies with viscosity ratio 1 and elasticity ratio 1 were generated using Paliernernemulsion viscoelasticity model, with the dispersed phase size, loading and interfacial tension asrnvariables. Melt coextrusion of these model blends with the matrix was simulated in a viscoelasticrnframework. Analysis of simulated melt normal-stresses at the interface reveals that a morerndeformable dispersed phase in the blend would result in conditions for stronger interlayerrnadhesion during coextrusion.