Study of thin films made from aromatic polymers containing six-member imide rings

Abstract

This study was concerned with the synthesis and study of thin films made from polyimides containing naphthalene and oxadiazole rings. These polymers were prepared by polycondensation reaction in solution at high temperature of aromatic diamines containing preformed oxadiazole ring with a mixture 1: 1 of a naphthalene-containing dianhydride with hexafluoroisopropylidene-dianhydride. The resulting aromatic polymers containing six-member imide rings were soluble in polar amidic solvents and in less polar solvents, and their solutions gave flexible films having tough mechanical properties. The thermal stability and glass transition temperature of these polymers were measured and compared. The quality of the spin-coated films of these polyimides was investigated by atomic force microscopy. The photoluminescence properties of the polymers in solution and in thin films were studied to survey the color of emission. The UV absorption was also investigated to determine the Stokes shift and hence possible reabsorption effects, and the photo-optical stability of the polymers at high temperatures.