Infrared reflection–absorption spectroscopy of surface modified polyester films

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Abstract
Infrared reflection–absorption spectroscopy (IRRAS) has been used to study the chemical and morphological changes which occur during oxygen sputter etching of poly(ethylene terephthalate) (PET). The IRRAS results show that the PET in immediate contact with the oxygen plasma is oxidized to a depth of about 3 nm and is of low molecular weight; about one‐third of it is soluble in water. Beneath this layer is a region of chemically unmodified, but crosslinked, amorphous PET. This layer is of variable thickness with an equivalent thickness in the range of 2–20 nm.

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