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Photooxidation of PET fibres or films creates fluorescent by-products which are separated in wavelength from the intrinsic fluorescence of PET. An experimental technique is described which allows the study of the dependence of photooxidation on wavelength by the fluorescence of only a single specimen. Furthermore, using polarized fluorescence, the conservation of photoselected orientation can be investigated if the photooxidation is carried out with linearly polarized light. Evidence is presented that photooxidation of PET films takes place under partial conservation of the photoselected molecular orientation.

Fluorescence Measurements on the Photooxidation of Poly(ethyleneterephthalate) Films and a Photoselective Effect