The photo-conversion of pre-polymer mixture NOA65 (Norland, USA) doped with TiO 2 nanoparticles is studied by the method of dielectric spectroscopy. The photopolymerized composites show low frequency relaxation and ion conductivity typical for liquids. This is explained by the reaction of TiO 2 particles with components of NOA65 mixture that blocks photopolymerization of pre-polymer and increases concentration of ion carriers. In addition, strong photochromism of NOA65-TiO 2 composites is observed which makes this system quite attractive for non-linear optics and associated applications. It may be caused by formation of titanium mercaptide and its transfer from IV to III valency state under UV irradiation.
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