Abstract
The surface molecular orientation of biaxially stretched poly(ethylene terephthalate) (PET) films and the effect of the oxygen-ion and oxygen-radical beam irradiation on it 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. The oxygen-ion beam exposure induces degradation of the polymer chain and converts the ester moiety to –COOH terminal species. In contrast to the case of oxygen-ion beam, oxygen-radical beam mainly affects the phenyl ring of PET.
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