Journal of Photopolymer Science and Technology

Paper is a brief review of the original results of investigations and development of some organic light-sensitive media which provide realization of photoinduced dichroism and birefringence, their applications in optical recording and processing of information, phototechnology of manufacturing optical elements.

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Photochemical phase transition of polymer liquid crystals (PLCs) was explored for PLCs with mesogenic side-chain phenylbenzoate and cyanobiphenyl. The photochemical phase transition was triggered by photochemical reaction of photoresponsive molecules incorporated physically or covalently into PLCs as a result of lowering of phase transition temperature of the mixtures below the irradiation temperature. Factors affecting the photochemical phase transition are discussed and resolution of stored image was examined.

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In order to probe the molecular distribution in two-dimensional molecular as semblies, photochemical properties of octadecylstilbazolium bromide in mixed bilayer membranes with dioctadecyldimethylammonium bromide were investigated as well as spectral behaviors. A large hypsochromic shift in the absorption spectrum of the s tilbazolium amphiphile observed in the polyion complex film with chondroitin sulfate indicated formation of phase separated clusters of the stilbazole amphiphiles. Photodimerization reaction of the stilbazole amphiphile was dominant in the phase separated clusters. Though the spectral shift in the complex film with poly(styrene sulfonate) was very small, presence of the clustered species were able to be detected through the photodimerization reaction. Photochemical reaction of the stilbazolium amphiphile is a sensitive probe even for a small change o f the molecular distribution in bilayer membranes.

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Benzyl methacrylate polymers of varying tacticities and substituents on the phenyl group were prepared to examine the dependence of energy trap formation on the polymer structure. In solution, lower isotacticity as well as steric hindrance imposed by the substituents suppresses excimer emission which is the sole trap emission observed. In solid film, while excimer-forming sites are the main energy traps for the isotactic polymers, the atactic polymers afford ground-state traps which appear to be formed in sequences other than isotactic ones. Formation of both of these traps is suppressed by the bulky substituents on the phenyl group. Continuous irradiation of the films led to formation of new energy traps, which apparently are stilbene- as well as phenanthrene-type photoproducts.

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