Poly o-tolyl vinyl ketone

Poly(o-tolyl vinyl ketone) (5.20) is much more photochemically stable than poly(phenyl vinyl ketone) (5.15). The o-methylbenzoyl group stabilizes the polymer, which would otherwise undergo the Norrish Type II reaction. The effect is due to the photoenolization of this chromophore, a process which competes favourably with the photofragmentation [197, 198]  

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Poly(o-tolyl vinyl ketone-comethyl vinyl ketone) Poly(p-methoxy phenyl vinyl ketone)... 

Poly(phenyl vinyl ketone-co-a-methylstyrene) Poly(phenyl vinyl ketone-co-o-tolyl vinyl ketone) Poly(phenyl vinyl ketone-co-)5-phenylpropiophenones) Poly(p-methyl phenyl vinyl ketone)... 

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