Subinclusion morphologies in HDPE/PS/PMMA ternary blends prepared by twin screw extrusion

摘要

Ternary blends of PS and PMMA in a PE matrix were prepared by twin screw extrusion to investigate the effect of viscosity ratios, sequence of addition and composition on the core/shell encapsulation phenomenon. The morphology was observed by SEM after selective extraction of either PS or PMMA. Composite droplet morphologies were observed with PS encapsulating PMMA as predicted by spreading coefficient theory. Processing and material viscosity effects are discussed. Good agreement was found between the obtained morphology and those expected from the theory of spreading coefficient.