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Reaction scheme for cationic ring opening frontal polymerization of oxiranes. (1) Photo-induced cleavage of iodonium salt from a singlet (S1) and/or triplet (T1) excited state, that generates cations, radical cations and free radicals ultimately producing a superacid; (2) Protonation of oxirane monomer; (3) Exothermic reaction of protonated monomer with oxiranes resulting in a polymer chain growth.
