The photolysis of poly(p-hydroxystyrene) |
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Authors: | N.A. Weir J. Arct M. Farahani |
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Affiliation: | Chemistry Department, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada |
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Abstract: | The photochemistry of poly(p-hydroxystyrene) (PPHS) has been investigated, thin films being exposed to 254 nm radiation under high vacuum at 298K. H2 is the principal volatile product, but small amounts of H2O are also formed. The polymer becomes rapidly coloured, but unlike other styrene polymers, which remain yellow, PPHS undergoes a progressive colour change from yellow through orange to brown. Infrared spectral data indicate the depletion of OH group concentration, and a concomitant formation of carbonyl, possibly quinonoid species. Crosslinking is rapid and no chain scission was detected. It is likely that the polymeric phenoxy radicals formed by photolysis or by subsequent H-abstraction contribute to the formation of both quinonoid species and crosslinks. The mechanism of the photolysis is discussed. |
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