Long wavelength photoinitiated free radical polymerization using conjugated thiophene derivatives in the presence of onium salts

Abstract

A highly conjugated thiophene derivative, 3,5-diphenyldithieno[3,2-<italic>b</italic>:2′,3′-<italic>d</italic>]-thiophene, has been used as an electron-transfer photosensitizer for long wavelength free radical photopolymerization of (meth)acrylic monomers in the presence of onium salts.