Studies on Photosensitive Polymers (X). Studies on Photosensitivity and Spectral Sensitivity of Naphthoquinone-1,2-diazide-5-sulfonyl Esters

感光性 樹脂에 關한 硏究 (第10報). Naphthoquinone-1,2-diazide-5-sulfonyl Esters의 感光性과 分光感度

  • Shim Jyong Sup (Department of Chemical Technology, College of Engineering, Seoul National University) ;
  • Kang Doo Whan (Department of Chemical Technology, College of Engineering, Seoul National University)
  • 심정섭 (서울大學校 工科大學 工業化學科) ;
  • 강두환 (서울大學校 工科大學 工業化學科)
  • Published : 1975.08.30

Abstract

Photosensitive properties of naphthoquinone-1,2-diazide-5-sulfonyl esters (PGND, BEND and PVAND) of polyglyceryl phthalate(PG), bisphenol A-epichlorohydrin condensate(BE) and polyvinyl alcohol(PVA) were investigated by the change of solubility before and after exposing to light. Various samples coated on glass or quartz plates were exposed to light under various conditions and steeped in aqueous alkali solution, and then the yield of residual film(W/W0) was determined. The yield of residual film, which was closely related to the sensitivity of the film, was affected by the degree of polymerization of the backbone resin, sensitizers and their concentration. In polymer homologs, the sensitivity was dependent on the degree of polymerization(the higher, the better). And also, it was most effective when 5 % of sensitizers to esters was used. The minimum exposed time was 0.6 min. for PGND-1, 1.0 min. for BEND-1, and 3.0 min. for PVAND-1. Most effective sensitizers for PGND, BEND and PVAND among those used here were benzanthrone, 5-nitroacenaphthene and picramide, respectively. The spectral sensitivities of PGND, BEND and PVAND were examined by comparing their spectrograms with UV-spectra in a solid state. Also, the sensitization and spectral sensitivity of the above polymers were studied. All the polymers containing the sensitizers showed optical sensitization. From the fact that in either case of sensitized or unsensitized sample, the ranges of absorption-maximum wave length were almost consistent with sensitivity maximum wave length, it was proved that the light absorbed by a sample served efficiently for photochemical reactions. Benzanthrone was found to be an excellent sensitizer for PGND.

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References

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