A new photo‐functional copolymer was designed by etherification or esterification of poly‐[N‐(4‐hydroxyphenyl)maleimide‐co‐styrene] or poly[N‐(4‐carboxyphenyl)maleimide‐co‐styrene] with p‐bromomethylnitrobenzene using 1,8‐diazabicyclo[5.4.0]‐undec‐7‐ene (DBU) as the base in an aprotic solvent. The chain‐stiffening effect of the N‐substituted maleimide group provided good thermal stability. It was observed that the photosensitivity of the copolymer is enhanced by the addition of a base like tributylamine.
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Chiang et al. (1994) studied this question.
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