Abstract
The wavelength sensitivity of low-density polyethylene (LDPE) films exposed to filtered xenon arc radiation was determined by the sharp cut filter technique based on the changes in IR absorption and tensile properties. The spectral sensitivity curves in terms of both changes in IR absorption of carbonyl and elongation at break had a similar trend, and the spectral region, responsible for PE photo-oxdation, was found to be in a rather wide range of approximately 260–420 nm. The activation spectra of PE at two different irradiation times based on the changes in IR absorption were also obtained. From the activation spectra it was shown that the most effective spectral region for causing PE photo-oxidation is in the range 330–360 nm. The results are discussed from the point of view of photo-oxidation mechanism.
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