Nonsalt 1-(Arylmethyloxy)pyrene Photoinitiators Capable of Initiating Cationic Polymerization

Analysis of photoproducts derived from 1-(methoxynaphthalen-1-ylmethyloxy)pyrene initiators and polymer end groups demonstrated that methoxynaphthalen-1-ylmethyl carbocation is involved in the initiation steps for both styrene (St) and cyclohexene oxide (CHO) polymerization. Charge transfer from the pyrenyloxy oxygen atom to the methoxynaphthalen-1-ylmethyl chromophore in the singlet excited state is assumed to be responsible for the efficient generation of the carbocation species, which also initiates the copolymerization of St and CHO. (c) 2014 Wiley Periodicals, Inc.