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The interfacial thickness between different polymers depends on miscibility. Especially the interaction parameter ÷ which dominate miscibility between different polymers can be estimated from the equilibrium interfacial thickness in immiscible polymer pair. Usually because the interfacial thickness between immiscible polymers is very thin, the adhesion strength is very low. We measured the interface formation process in spin-coating samples by a high speed ellipsometer and observed a behavior that interfacial thickness increased suddenly. This behavior occurred in a temperature less than T g of bulk and showed a large increasing speed of interfacial thickness. Moreover, an interfacial thickness formed by this behavior reached several times of the equilibrium interfacial thickness in immiscible systems. We applied this behavior to adhesion between immiscible polymers and succeeded in obtaining strong adhesion.

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