Thermotropic and Solution Photoisomerization Properties of Side-Chain Liquid Crystalline Polymers Containing Methyl-Substituted Azobenzene Mesogens
The thermotropic and solution photoisomerization properties of a class of polyacrylates containing differently methyl-substituted azobenzene groups are presented.Methyl-substitution inhibits the tendency to crystallize and causes a dramatic decrease in the stability of the established nematic phases.These effects result from a restriction of the packing capability of the mesogenic groups and a reduction of their length-to-breadth ratio.In dilute solution all polymeric samples undergo trans-to-cis photoisomerization of the azo group upon irradiation in the absorption region of the ? ---> ?* electronic transitions.Photoisomerization rate constans are very similar and of the same order of magnitude as those observed for other polymeric systems containing the unsubstituted azobenzene chromophore.
Chiellini, E.,Galli, G.,Altomare, A.,Solaro, R.,Angeloni, A. S.,et al.
p. 61 - 69
(2007/10/02)
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