Proceedings of the XVIIth Conference Modification of Polymers
Conference:
Conference Modification of Polymers edition:XVII location:Kudowa Zdrój date:12-15 September 2005
Abstract:
The photochromic silica-based organic-inorganic hybrid materials containing cyanoazobenzene chromophores were investigated by optical and dielectric spectroscopy. These materials were obtained via sol-gel process. They were deposited on glass substrates by spin coating technique to provide thin transparent films. The UV-Vis spectroscopy showed reversibility of the trans-cis-trans isomerization of the chromophoric fragments. Molecular mobility in investigated materials were studied by means of dielectric spectroscopy. A variety of relaxation process is observed: the a -process and at room temperature the process related to the local movement of the azobenzene group. A correlation between dielectric and photochemical behaviour is discussed.
