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The Approach
The analysis of additives that are a portion of the composition of polymer samples requires multiple analytical methods. The methods selected are influenced by the specific additives that are to be characterized and the physicochemical properties of these additives. Hindered phenolic antioxidants and phosphite antioxidants have been evaluated using reverse-phase high performance liquid chromatography coupled with UV detection (HPLC-UV).
Higher molecular weight oligomeric hindered amine light stabilizers (HALS) have been analyzed using proprietary analytical techniques.