Photooxidation of Polypropylene/Montmorillonite Nanocomposites. 2. Interactions with Antioxidants

The influence of stabilizing additives on the photooxidation of polypropylene/montmorillonite (PP/MMt) nanocomposites exposed to UV light was studied. Two different stabilizers were used, a phenolic antioxidant and a redox antioxidant. A significant reduction in the induction period of oxidation was...

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Bibliographic Details
Published in:Chemistry of materials 2005-03, Vol.17 (5), p.1072-1078
Main Authors: Morlat-Therias, Sandrine, Mailhot, Bénédicte, Gonzalez, David, Gardette, Jean-Luc
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
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Summary:The influence of stabilizing additives on the photooxidation of polypropylene/montmorillonite (PP/MMt) nanocomposites exposed to UV light was studied. Two different stabilizers were used, a phenolic antioxidant and a redox antioxidant. A significant reduction in the induction period of oxidation was observed in the presence of MMt. This is believed to arise from interactions between the additives and the nanoclay. The interactions could involve the adsorption of additives onto the clay, the degradation of the alkylammonium cations exchanged in MMt, and the catalytic effect of iron impurities of the organomontmorillonite. Iron could catalyze the decomposition of the primary hydroperoxides formed by photooxidation of PP, which would in turn accelerate the additive consumption and decrease the length of the period before the permanent regime of oxidation is reached.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm040172l