A comparative investigation of the photochemical behavior of dichromated gelatin
(DCG), dichromated polyacrylic acid (DCPAA) and dichromated polyvinylalcohol (DCPVA)
gives evidence for the similarity of the photochemical behaviour involved when recording
holograms in DCG and DCPVA. Chromium (V), the chromium species resulting from the
photoredox process between the starting chromium (VI) (dichromate) and the polymeric
chain, is stable, likely strongly complexed in gelatin and polyvinylalcohol. The quantum
yields of the reaction are high and similar for both reactions. On the contrary, even though
chromium (V) is also formed during the primary process in DCPAA, this species is quite
unstable and disappears as soon s the irradiation is stopped. The behavior observed in DCG
can be assigned to the presence of CM groups on the polymeric chain, these groups being the
only groups present in polyvinylalcohol.
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