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Photosensitive poly(vinyl alcohol) bearing N ‐(1‐pyridinio)benzamidate groups
Author(s) -
Nagasawa Jun'ichi,
Tamaki Takashi,
Ichimura Kunihiro
Publication year - 1993
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1993.220040806
Subject(s) - vinyl alcohol , vinyl acetate , polymer chemistry , materials science , irradiation , polymer , absorption of water , alcohol , absorption (acoustics) , nuclear chemistry , pyridinium , chemistry , composite material , organic chemistry , copolymer , physics , nuclear physics
Poly(vinyl alcohol) (PVA) bearing N‐(1‐pyridinio)benzamidate (PB) was synthesized through acetalization of PVA and 4‐dimethoxymethyl‐N‐(1‐pyridinio)benzamidate (DMPB) in water. The PB groups in PVA–PB had almost the same proportion of DMPB to the starting PVA. The UV spectrum of PVA–PB shows an absorption band of pyridinium ylide as a shoulder around 300 nm in water, and as a maximum at 315 nm in a film on a quartz plate. These absorption bands decreased on irradiation at 313 nm. The photoreaction of the PVA–PB film proceeds much faster than that of PVA–PB in water. The solution, of PVA‐bearing high‐PB content, became slightly turbid during irradiation. After irradiation the film became insoluble in water, and the soluble fraction of polymer (P̄ = 1700) was 3% at a PB content of 1 mol% and less than 1% at that of more than 2 mol%. This polymer can be applied as a water‐soluble negative photoresist.