Self-adhesion of poly(4,4'-oxydiphenylene biphenyltetracarboximide) and its adhesion to substrates

Poly(4,4′-oxydiphenylene biphenyltetracarboxamic acid) was synthesized in N-methyl pyrrolidone from biphenyltetracarboxylic dianhydride and 4,4′-oxydiphenylene diamine, and then converted to the polyimide in films by thermal imidization at 400 °C. The polyimide exhibits an exceptionally good self-adhesion (814-1187 J/m2) and also good adhesions (>687 J/m2) to inorganic substrates such as silicon wafer and glass ceramic. An oxygen plasma treatment enhances the self-adhesion highly, whereas a silane primer treatment improves the adhesions to the substrates. In addition, the morphological structure and some other properties were investigated.