Photochemical cross-linking study of polymers containing diacetylene groups in their main chain and azobenzene compounds as pendant groups

 

E. Vigueras-Santiago, S. Hernández-López * and A. Rodríguez-Romero

 

Laboratorio de Investigación y Desarrollo de Materiales Avanzados, Facultad de Química, UAEM, Paseo Colón esquina con Paseo Tollocan sin número, C.P. 50000, Toluca, Estado de México. México  *shernan@uaemex.mx

 

Abstract

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.

 

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Acknowledgements

This project was funded by the Universidad Autónoma del Estado de México (UAEM) as project No. 1664/2003. We would like to thank MSc María Magdalena García Fábila (FQ-UAEM), Technician Ruth Georgina Salinas Gómez (FQ-UAEM), ChEn Miguel Ángel Canseco (IIM-UNAM) for his support in the characterization techniques.

 

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