Enhanced cationic photocuring of epoxides with styrene oxide as a reactive diluent
- Enhanced cationic photocuring of epoxides with styrene oxide as a reactive diluent
- 안광덕; 김만호
- cationic photocuring; cationic photopolymerization; reactive diluent; Benzyl cation; Styrene oxide; Hybridization by photocuring
- Issue Date
- Progress in organic coatings
- VOL 73, NO 2-3, 194-201
- Styrene oxide [StO] has been investigated as a reactive diluent for cationic photocurable formulations
to provide key requirements such as low viscosity and negligible odor, in addition to high photoreactivity.
The formulations were composed of commercial cyclic ethers including epoxides and oxetanes
in StO using diaryliodonium salt as a photoinitiator, and they gave enhanced photocuring by analyzing
with differential photocalorimetry. In particular, the cationic formulations composed of StO, bisphenol
A diglycidyl ether, (3-glycidoxypropyl)trimethoxysilane and others rendered improved mechanical and
thermal properties when their photocured coatings were examined. The gel content and pencil hardness
values of photocured films were determined to evaluate the formulations. For the mechanistic explanation
of the enhanced photoreactivity, the polymer-bound benzyl cations formed by a chain process in the
polymer chains comprising StO moieties were postulated to serve as additional sites for the initiation of
cationic photopolymerization of StO and cyclic ether monomers.
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