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A simple ionic azo-dye polyelectrolyte complex, free of flexible spacer and tail, was prepared from two readily available components. It possesses smectic A order from subambient to degradation (above 230 °C) and provides exceptional photoinduced birefringence (PIB) properties, competitive with if not superior to those of previously reported all-covalent azo polymers.
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Zhang et al. (2007) studied this question.
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