Abstract
Reflectance IR spectroscopy has been carried out for quantitative structural analysis of polyimide films thinner than 1000 A. Reflection spectra have been simulated for isotropic polyimide films of specific thickness on a metallic substrate. Structural analysis was based on a number of IR active vibrations particularly sensitive to changes in chain conformation or packing. The structure of these films was compared with that obtained by annealing experiments on free standing films and crystalline powders. For adsorbed films with thicknesses <150 A, very low packing order was found. Frequency shifts in films of varying thicknesses were observed to be sensitive to changes in chain conjugation which are dependent on the coplanarity of rings along the backbone
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