AbstractPolystyrene has been partially or completely modified to contain varying amounts of vinyl‐trans‐benzalacetophenone units in the polymer chain. Acetylation of polystyrene gave a pure poly(vinylacetophenone) which, when condensed with benzaldehyde, produced varying proportions of vinyl‐trans‐benzalacetophenone in the polymer. These styryl ketone polymers are very sensitive to ultraviolet radiation, thin layers becoming insoluble on brief exposure, yet can be stored in the dark for years without
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