We introduce a mean field model that allows us to determine the interfacial behavior of AB random copolymers. Through this model, we calculate the reduction in interfacial tension γ that occurs when the random copolymers localize at the interface between immiscible homopolymers A and B. We also isolate the conditions under which the random copolymers are most efficient at reducing γ and therefore act as efficient compatibilizers. The calculations are useful in designing low-cost copolymer additives that significantly improve the properties of polymer blends.

• Received 21 April 1995

DOI:https://doi.org/10.1103/PhysRevE.52.5061