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5 October 1999 High-Tg multifunctional photorefractive polymer
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We describe new high Tg multi-functional polymers. In order to develop a photorefractive system with stable phase behavior at elevated temperatures we synthesized a series of maleimide/methyl vinyl isocyanate copolymers with carbazole as charge transporting moieties. We chose carbazole substituents attached with different spacer groups to adjust Tg of the polymers between 60 degrees C and 194 degrees C. As NLO chromophores we used hydroxyl alkyl functionalized 2- (N-ethyl-4-(4-nitrogen-phenylazo)-anilino)-ethanol and 2- (2,5-dimethyl-4-(4-nitro-phenylazo)-ethanol and 1-(4- ethylhydroxyphenyl)-3-methyl-4-(4-diethylaminophenyl)imino- pyrazole-5-on. Chromophore contents up to 44 mol percent have been attached under mild conditions by polymer analogous reactions. The materials are amorphous and posses excellent solubility in common solvents, e.g. chloroform and THF. Holographic four-wave mixing experiments was performed on a device made from a polymer elasticized such that the glass-transition temperature was Tg equals 80 degrees C. For the grating formation two exponential response times were found wit (tau) 1 equals 100 ms and (tau) 2 equals 1,5 s and a logarithmically weighted average response time of 200 ms.
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Erik Hattemer, Rudolf Zentel, Erwin Mecher, and Klaus Meerholz "High-Tg multifunctional photorefractive polymer", Proc. SPIE 3799, Organic Photorefractives, Photoreceptors, Waveguides, and Fibers, (5 October 1999);

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