Photoinitiated cationic polymerization of epoxy alcohol monomers

Cationic photopolymerization of bisphenol A diglycidyl ether epoxy under 385 nm

“…In fact, there was a competition between EEC and DGEBA for the secondary oxonium, large amount of EEC consumed too much active site with higher activity resulting in the decrease of the conversion of DGEBA. This result agreed with the conclusion of Crivello's work …”

Novel diol spiro orthocarbonates derived from glycerol as anti‐shrinkage additives for the cationic photopolymerization of epoxy monomers

“…This effect was reported previously by Penczek and co‐workers 19–21. They described a new mechanism for the polymerization of epoxy monomers called the activated monomer mechanism that takes place when the cationic polymerization of epoxides is carried out in the presence of alcohols, and it has been discussed in detail for UV‐curable systems by other authors 22–25. In this mechanism the terminal oxonium ion of the growing polyether chain reacts with the hydroxyl group of the alcohol resulting in a rapid proton transfer from the growing chain end, back to the monomer.…”

Competitive Nucleophilic Attack Chemistry Based on Undecenoic Acid: A New Chemical Route for Plant-Oil-Based Epoxies

“…This fast curing feature can be attributed to the built-in NFH groups in the ECUA and EMCUA systems. The steric requirement for a hydroxyl group (i.e., NFH in this case) attacking upon an epoxy oxonium ion is relatively less compared to that between two epoxy rings; therefore, a faster curing behavior of ECUA and EMCUA is expected, which was supported by additional experiments described in the Supporting Information (Figure S12). A similar phenomenon was also found in Sangermano’s work .…”