The Effect of Vinyl Carbazole on the Photosensitivity of Polymeric Photodielectric Media

Two kinds of polymeric photodielectric media with and without the addition of vinyl carbazole were characterized for their holographic photosensitivity using a 514.5nm argon laser line.The materials used were polymethyhnethacrylate (PMMA) and poly (ethyl - a-cyanoacrylate) (PECA) respectively with p-benzoquinone as the sensitizer. Vinyl carbazole was added to both media arid test results contrasted. It was found that the 514.5nm absorption on the media containing vinyl carbazole was enhanced. Owing to the charge-transfer complexes formed by p-benzoquinone with vinyl carbazole, the photosensitivity of the materials (PMMA) is increased. Mechanism of photochemical changes involved is also briefly discussed.