A novel radical polymerization system initiated by a redox reaction with NHPI and xanthone

A novel redox reaction system consisting of xanthone (XT) and N -hydroxyphthalimide (NHPI) for radical polymerization is developed where NHPI and XT experience a one-electron-transfer reaction, which produces two kinds of radicals, PINO radicals and cycloketyl (CK) radicals.