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Photochemical conversion of 4-(2′-nitrophenyl)-1, 4-dihydropyridine derivatives was found to act as a chromophore for photosensitive polyimide precursors giving a dual imaging-mode characteristics. The sensitivities and contrasts for the negative and positive-working poly (amic-acid)'s were evaluated. The photochemical behaviors such as the quantum yields of the photoemission and the conversion, the reaction products and the transient species were studied. The mechanism of photosensitizing poly(amic-acid) was proposed.
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Yamaoka et al. (1996) studied this question.
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