Ki. Ito et al., PHOTO-INITIATED AND THERMAL CURING OF EPOXIDES BY THE USE OF PHOTO BASE GENERATORS BEARING ACYLOXYIMINO GROUPS, Canadian journal of chemistry, 73(11), 1995, pp. 1924-1932
The formation of amines by the photolysis of O-acyloximes derived from
acetophenone oxime, benzophenone oxime, fluorenone oxime, and 2-aceto
naphthone oxime and the curing of epoxides by the resulting amines wer
e investigated. The quantum yields of their photolysis at 366 nm in po
lystyrene films depend on their structures, and those for bifunctional
ones bearing phenyl or naphthyl moieties were found to be very high,
at 0.88 and 0.76, respectively. The yields of the resulting amines in
polymer matrices were higher than those in solution. The yields for O-
acyloximes bearing a naphthyl moiety were ca. 90% and higher than for
those bearing a phenyl moiety. Although the resulting amines were effi
cient photo-cross-linkers for poly(glycidyl methacrylate), they were n
ot effective for curing of epoxy resins (oligomers). On the other hand
, polymer amines with a glass transition temperature lower than room t
emperature, which were obtained by the photolysis of copolymers bearin
g acyloxyimino groups, were found to be effective photo-cross-linkers
for the epoxy resins.