Photo- and thermal-oxidation of polyethylene: Comparison of mechanisms and influence of unsaturation content |
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| Authors: | Mélanie Gardette Anthony Perthue Jean-Luc Gardette Tünde Janecska Enik? Földes Béla Pukánszky Sandrine Therias |
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| Institution: | 1. Clermont Université, Université Blaise Pascal, Institut de Chimie de Clermont-Ferrand (ICCF), Equipe Photochimie, BP 10448, F-63000 Clermont-Ferrand, France;2. CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand (ICCF), Equipe Photochimie, F-63173 Aubière, France;3. Tisza Chemical Group Public Limited Company (TVK), H-3581 Tiszaújváros, P.O. Box 20, Hungary;4. Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 17, Hungary;5. Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1521 Budapest, P.O. Box 91, Hungary |
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| Abstract: | The behaviour of polyethylene with different contents in vinyl and t-vinylene groups have been studied by photooxidation with λ ≥ 300 nm light or by thermooxidation at a temperature of 100 °C. The oxidation was studied by infrared spectroscopy and it was shown that the same oxidation products were obtained, but with different relative concentrations depending on the conditions of ageing, i.e. photochemical or thermal conditions. The mechanisms by which the oxidation products are formed were recalled. The differences between photo- and thermo-oxidation were evidenced on the basis of the stability of ketones that do not accumulate in photochemical conditions, as a result of Norrish reactions. The influence of the initial amount of unsaturated groups on the rates of oxidation was characterized. It was shown that the concentration of unsaturations had no effect on the rate of photooxidation but dramatically influenced the stability in thermooxidative conditions. |
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| Keywords: | Polyethylene Photooxidation Thermooxidation Unsaturations Norrish |
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