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Abstract

Carbon dioxide (CO₂) generation by ultraviolet irradiation of poly(ethyleneterephthalate) (PET) films in oxygen was monitored by in situ Fourier transform infrared spectroscopy. Typically, the CO₂ absorbance increased by ∼100 × 10⁻⁴ in 180 min, with no evidence of hindrance by restricted diffusion of O₂ into, or CO₂ out of, the films. It was concluded that Fourier transform infrared spectrometry monitoring of CO₂ conveniently, reliably and rapidly measures PET films photostability.

Quantitative analysis of the CO₂ evolved from progressively thinner films from successive stages of the biaxial film drawing process indicated that CO₂ was generated within a few microns of the film surface and that the same amounts were generated from the irradiated surface of 540 μm cast, 150 μm uniaxially drawn and 85 μm biaxially drawn films. Although drawing increased film crystallinity, photoreactivity appeared to be unchanged. However, total CO₂ formation followed the pattern PET cast<PET uniaxial<PET biaxial because ultraviolet irradiation attenuation reduced photo generation at the rear of thick films.

Keywords

POLY(ETHYLENETEREPHTHALATE) (PET)PHOTODEGRADATION FOURIER TRANSFORM INFRARED SPECTROMETRY CO2 ULTRAVIOLET IRRADIATION

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Carbon dioxide formation during initial stages of photodegradation of poly(ethyleneterephthalate) (PET) films

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