Studies on Interfacial Structure and Adhesion between Different Polymers,and Its Formation Process

Abstract

The interfacial thickness between different polymers depends on miscibility. Especially the interactionparameter x which dominate miscibility between different polymers can be estimated from theequilibrium interfacial thickness in immiscible polymer pair. Usually because the interfacial thicknessbetween immiscible polymers is very thin, the adhesion strength is very low. We measured the interfaceformation process in spin-coating samples by a high-speed ellipsometer and observed a behaviorthat interfacial thickness increased suddenly. This behavior occurred in a temperature less than T_g ofbulk and showed a large increasing speed of interfacial thickness. Moreover, an interfacial thicknessformed by this behavior reached several times of the equilibrium interfacial thickness in immisciblesystems. We applied this behavior to adhesion between immiscible polymers and succeeded in obtainingstrong adhesion.