Photooxidation of PVC |
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Authors: | J C Marechal |
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Institution: | Centre Scientifique et Technique du Batiment Etablissement de Grenoble, Division Physique des Matériaux , 38400, Saint-Martin-d′Hères, France |
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Abstract: | Pure and peroxided PVC films were irradiated under monochromatic ultraviolet light between 300 and 400 nm. The degradation state of PVC is measured by means of carbonyl absorption in the infrared spectra and polyene content by UV spectroscopy. The initial rate of carbonyl formation depends on the wavelengths and oxidized impurities content. Peroxided PVC is oxidized faster than pure PVC with wavelengths above 320 nm. Two hazardous ranges of wavelengths have been detected: 300–320 and 350–370 nm. Good protection of PVC against UV radiation can be assured by the exclusion of wavelengths under 380 nm. |
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Keywords: | Polymolecularity Correction Factors Radius of Gyration Intrinsic Viscosity Second Virial Coefficient Polyacrylonitrile |
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