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Determination of Antioxidants in Plastics and Rubber

SpecialChem / Aug 23, 2007

In the determination of antioxidants in plastics and rubber most of the analytical problems arise from three factors: the situation of the antioxidant in a more or less in soluble polymer matrix, the high reactivity and low stability of many types of antioxidants, and the low concentrations of antioxidants present in the polymer matrix. To this must be added the fact that polymers usually contain several different types of additives, e.g., lubricants, UV stabilisers, and usually solvent extraction and chromatographic steps have to be introduced in order to avoid interference problems in the extraction of determination of antioxidants. These various factors combine to make the determination of antioxidants in polymers and challenging problems for the analytical chemist. To avoid such changes it is recommended that polymer extracts are stored in actinic glassware under nitrogen and that analysis is continued without delay.This approach is only applicable to stable polymer additives which, unlike antioxidants are stable under ionising conditions.

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