A new polyurethane cationomer with pendent azo groups bounds to quaternary nitrogen atoms has been synthesized by polyaddition reaction between poly(tetramethylene oxide) (PTMO), 4,4′‐bibenzyldiisocyanate and N‐methyldiethanolamine, followed by quaternization of tertiary nitrogen with 4‐(3‐chloropropionyloxy)azobenzene. E–Z photoisomerization of azo chromophores by UV irradiation with a high pressure mercury lamp and Z–E thermal relaxation were studied both in solution and film. An azo urethane model and a synthetic mixture of polyurethane cationomer with azobenzene were used for comparison.
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Buruianǎ et al. (1993) studied this question.
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