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Coextrusion experiments were performed using well-characterized LDPE resins in an effort to gain a better understanding of interfacial instability phenomena. The resins used were chosen carefully and included materials of high and low viscosity as well as broad and narrow molecular weight distributions (MWD). The experiments involved the coextrusion of either the same material in both layers or various combinations of the four materials and the focus of the work was to elucidate the effects of flow rates, molecular weight (MW) and MWD on inter-facial instability. The effect of the geometry at the point where the materials merged was also investigated.
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Interfacial Instabilities During Coextrusion of LDPEs, 1997 Polymers, Laminations & Coatings Confere