Abstract
Emulsions based on a 50:50 polymerised formulation of methyl methacrylate and butyl acrylate have been prepared containing various reactive and non-reactive hindered piperidine light stabilisers and co-reactive acrylamides. The oxidation products generated during photooxidation are characterised and related to their influence on subsequent photooxidative degradation. This involves the use of reflectance FT-1R spectroscopy to show functional group changes together with colorimetric UV analysis to determine photochemical generation of hydroperoxides. De-esterification and hydroperoxide formation are found to be important processes during latex photooxidation while the addition of low levels of co-monomer to the emulsion, give latices with improved photostability. Thus, while co-reactive hindered piperidine stabilisers are found to be effective, the incorporation of simple terminal dialkyl acrylamide/methacrylamide groups is equally as effective. The efficiency of diaklyamide groups operating through a sacrifical oxidation mechanism is discussed.
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