Abstract

VIGUERAS-SANTIAGO, E.; HERNANDEZ-LOPEZ, S.  and  RODRIGUEZ-ROMERO, A.. Photochemical cross-linking study of polymers containing diacetylene groups in their main chain and azobenzene compounds as pendant groups. Superf. vacío [online]. 2006, vol.19, n.1, pp.1-7. ISSN 1665-3521.

Photochemical cross-linking studies at different temperatures (room temperature, Tg and maximum exothermal of cross-linking peak) are shown for three series of polymers containing diacetylene-groups in the main chain and polar chromophores derived from benzene, azo- and di-azobenzene, as pendant groups. We establish the optimal irradiation time and temperature that permit them being poled and cross-linked with minimal dye-degradation. The degradation process was followed by a diminution of the respective maximum absorption peak. These conditions could extend the mean life-time of the second order nonlinear optical properties, studied previously. Photochemical cross-linking at each polymer's Tg (50-130°C) was the most convenient process. It took less than 10 min and was monitored by IR spectroscopy.

Keywords : Diacetylene; Cross-linking; Photodegradation.