Photo- and thermal oxidation of polyethylene: comparison of mechanisms and influence of unsaturation content
| Autor: | Jean-Luc Gardette, Tünde Janecska, Eniko Foldes, Anthony Perthué, Béla Pukánszky, Sandrine Therias, Mélanie Gardette |
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| Přispěvatelé: | Institut de Chimie de Clermont-Ferrand (ICCF), Institut de Chimie du CNRS (INC)-SIGMA Clermont (SIGMA Clermont)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Thermal oxidation
Degree of unsaturation Thermooxidation Polymers and Plastics Infrared spectroscopy Norrish Polyethylene Condensed Matter Physics Photochemistry Unsaturations chemistry.chemical_compound [CHIM.POLY]Chemical Sciences/Polymers chemistry Mechanics of Materials Materials Chemistry Photooxidation |
| Zdroj: | Polymer Degradation and Stability Polymer Degradation and Stability, Elsevier, 2013, 98, pp.2383-2390 Polymer Degradation and Stability, 2013, 98, pp.2383-2390. ⟨10.1016/j.polymdegradstab.2013.07.017⟩ |
| ISSN: | 0141-3910 1873-2321 |
| DOI: | 10.1016/j.polymdegradstab.2013.07.017⟩ |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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