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1 Materials Science Poland

1 2009

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Synthesis and photochromic properties of poly[N-vinyl-2-(phenylazo)-imidazole] derivatives in the near UV range

Koszykowska M., Tokarek M., Kucharski S.

Materials Science Poland

2009

Vol. 27, No. 3

699--708

The following novel photochromic poly(N-vinylimidazole) polymers have been synthesized: poly[N-vinyl- 2-(4-cyano-phenylazo)imidazole] (PV-4-CBAI), poly[N-vinyl-2-(3-cyano-phenylazo)imidazole] (PV-3 -CBAI) and poly[N-vinyl-2-(4-methoxy-phenylazo)imidazole] (PV-4-MBAI). Quantum chemical calculations of monomeric chromophores were carried out to foresee their linear and nonlinear optical properties. The polymeric materials were characterized by UV-vis spectroscopy and ellipsometry to determine changes in their properties during illumination. It was found that the stable trans form of polymeric chromophores absorbed in the range of 360-380 nm (absorption band maximum) and underwent trans-cis isomerization on illumination with 395 nm light. The ellipsometric measurement showed a change of the refractive index of polymer films during illumination, which was in the range of 0.010 to 0.014, depending on chromophore type.