Abstract
Abstract The surface molecular orientation, buried interface characterization of biaxially stretched poly(ethylene terephthalate) (PET) film, and its photochemical behavior by UV irradiation have been investigated by using infrared–visible sum-frequency generation (SFG). The SFG spectra of PET surface showed a pronounced peak at 1705 cm −1 which is characteristic of the CO stretching vibration in an ester function. The SFG spectra indicate that the polymer chains at the surface appear to be well aligned parallel to the surface plane. By depositing a TiO 2 film, the CO and the CC bonds of PET are tilted from the surface plane. Change of the molecular orientational conformation distribution is also observed in the case of TiO 2 /PET interface. In contrast to the case of TiO 2 /PET, deposition of SiO 2 film on PET surface does not induce changes in the molecular orientational conformation. By irradiating UV pulses, photo-degradation of PET is observed for TiO 2 /PET interface, while such degradation is not observed in PET surface and SiO 2 /PET interface.
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