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Photo- and thermal-oxidation of polyethylene : Comparison of mechanisms and influence of unsaturation content

Gardette, Mélanie and Thérias, Sandrine and Gardette, Jean-Luc and Janecske, Tünde and Földes, Enikő and Pukánszky, Béla (2013) Photo- and thermal-oxidation of polyethylene : Comparison of mechanisms and influence of unsaturation content. Polymer Degradation and Stability, 98. pp. 2383-2390. ISSN 0141-3910

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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.

Item Type: Article
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia
T Technology / alkalmazott, műszaki tudományok > T2 Technology (General) / műszaki tudományok általában
Depositing User: Dr. János/J Móczó
Date Deposited: 13 Jan 2014 15:13
Last Modified: 13 Jan 2014 15:13
URI: http://real.mtak.hu/id/eprint/8649

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  • Photo- and thermal-oxidation of polyethylene : Comparison of mechanisms and influence of unsaturation content. (deposited 13 Jan 2014 15:13) [Currently Displayed]

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