EFFECT OF LAYER SEQUENCING ON THE INTERFACIAL STABILITY OF COEXTRUDED MULTILAYERED FILMS INCORPORATING BALLISTIC RESISTANT MATERIALS

摘要

Flow simulations and coextrusion experiments were employed to characterize layer sequencing effects on the interfacial stability of coextruded five-layered films incorporating ballistic-resistant materials. A simple model of coextrusion was able to rank the relative coextrusion stability of multilayered structures qualitatively in terms of viscosity matching and viscoelastic considerations. However, thermal analyses and coextrusion experiments revealed that the overriding factor determining coextrusion performance was the thermal stability and degradation characteristics of the materials utilized to produce the multilayered films. Therefore, any predictive analysis of coextrusion should also consider appropriate degradation mechanisms and their affect upon melt rheology.