FTIR study of the structures of vapor deposited PMDA–ODA film in presence of copper phthalocyanine

Orientation structure of vacuum deposited thin layer polyimide matrix in presence of copper phthalocyanine as a “guest”, by means of polarization and derivative FTIR spectroscopy has been studied. The polymer layers (500 nm thick) prepared by vacuum co-deposition of polyimide precursors – oxydianiline and pyromellitic dianhydride and copper phthalocyanine (9%), followed by mixed treatment (microwave and thermal) have been investigated. The SEM investigation of layers that are microwave and thermally treated at temperatures 200 and 300 °C have no considerable difference in the surface structure. FTIR analysis of spectra in the range of molecular vibration 1300–700 cm−1 demonstrates that polyimide films thermally treated at 200 °C showed lower order structure than polyimide films treated at 300 °C. After derivatization of the polyimide spectra two bands at 1125 cm−1 and 1116 cm−1 have appeared which are related to two types C–N deformation vibration. The structure of the layers treated at higher temperature (300 °C) is higher order and is fixed in one plane (after derivatization single narrow band at 1114 cm−1 has appeared; the band at 903 cm−1 is missing). It was found that after microwave treatment the time of thermal treatment has no considerable influence. Preliminary microwave treatment allows reducing of the duration of thermal treatment.