Optically transparent hybrid organic-inorganic copolymers based on the poly-
TiO2, vinyl monomers and lactide or glycolide have been prepared. Optical and physi-
cal-mechanical properties of composites are depended with the ratio of components have
shown. Hybrid copolymers possess photochromic properties. By the UV light excitation
reversible darkening of the samples due to the transition Ti
4+
ļ Ti
3+
had observed. The
speed of transition depends on the copolymer composition.
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