چكيده لاتين :
The existence of interfacial instability at the interface of multilayer polymeric fluid is well known. The experimental studies have shown that interfacial instability of two-layer polymer melts plays an important role in polymer processing operation. This work is designed mainly to provide guidelines for the development of experimental techniques for the improvement of the two-layer polymer products in the polymer processing industry. This is done by performing a series of tensile tests on extruded two-layer polymer melts in order to get insight into the relation between interfacial instabilities and mechanical properties of polypropylene (PP) over high density polyethylene (HOPE) systems. Observed variations of the mechanical properties have been related to the conformation of the interfacial wave. Thus, a relationship is established between the interface morphology corresponding to extrusion instabilities and the mechanical characteristics of the interfacial strength
