Interfacial Structure between Different Polymers and its Adhesion

Because the adhesives usually consist of the multicomponents containing the polymer, the knowledge such as not only the miscibility between components but also the structure and properties in the adhesion interface is very important. We measured the interfacial thickness and the concentration profile between different polymers by using an ellipsometry and some methods of microscopy, and considered these from the viewpoint of miscibility. And, in order to investigate the initial formation process of the interface, the behavior of interfacial region was measured by a high-speed ellipsometry, whose measuring-time-interval was very short. It was considered that high mobility and entropic elasticity of the interfacial molecules contributed to the formation of the interfacial region on the initial stage. Moreover, the adhesion strength was measured in non-reactive and reactive systems and the relation between interfacial structure and adhesion strength was discussed.