Preparation of polyimide films using reactive aromatic amine fluorophores and their photophysical properties.
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Polyimide films have been developed for a variety of applications in many industries due to their excellent thermal and mechanical durability. However, polyimides generally have the intrinsic charge transfer character, and thus do not exhibit fluorescence emission in visible region. For the purpose of developing a highly durable fluorescent film with signal output function in an automobile interior sensor, in this study, we prepared films by adding reactive aromatic amine fluorophores in the process of manufacturing transparent polyimides. Polymerization was performed by adding a small amount of the reactive fluorophores to fluorine-based monomers having an effect of restraining charge transfer characteristics. The degree of imidization and transmittance were evaluated by infrared and ultraviolet-visible spectroscopy, respectively, and fluorescence quantum efficiency and photo-oxidative stability were examined using an optical microscope and a photoluminescence spectrophotometer.