Abstract
Two types of commercial plasticized opaque PVC films (0·16 mm thick), based on different kinds of suspension PVC have been investigated. Colourimetry, difference IR-spectra, MIR-IR spectra and elongation at break have been used for the assessment of changes during one year of weathering. Interesting results have been obtained with difference IR-spectra in the initial stages of exposure. Carbonyl absorption on the front surface layers of the specimens revealed non-monotonous development. During weathering, short polyenes accumulate to a smaller extent in the bulk of modified PVC based samples in comparison with the control. A relationship between discoloration and changes in double bond content on the exposed side is observed as well as autocatalytic changes in the later period. The behaviours of the two films tested and a discrepancy in the results obtained by different methods have been discussed.
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