Mechanisms of antioxidant action: The effect of galvinoxyl on the thermal oxidative stability of processed polypropylene |
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| Authors: | Rouhalla Bagheri Khirud B Chakraborty Gerald Scott |
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| Institution: | Department of Chemistry, University of Aston in Birmingham, Gosta Green, Birmingham B4 7ET, Great Britain |
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| Abstract: | The effectiveness of galvinoxyl (G·(I)) as a thermal antioxidant in polypropylene at 140°C is dependent on the prior processing treatment of the polymer. A characteristic fluctuation of antioxidant activity with time of processing is shown to be associated with the extent of conversion of galvinoxyl to hydrogalvinoxyl (GH) in the polymer. It is concluded that the main stabilisation mechanism involved is deactivation of alkylperoxyl radicals (CB-D) by GH but secondary processes (CB-D and CB-A) involving G· may also make a contribution. |
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