Abstract
Azobenzene containing side-chain liquid crystalline polymer was synthesized by hydrosilation reaction of poly(methylhydrosiloxane) with the azo monomer.The chemical structure and its liquid crystalline properties were investigated by FITR,DSC and POM with a hot stage.Photo-alignment treatment was performed on the polysiloxane film by using a linearly polarized light source with the wavelength of 473 nm.A static contact angle mea-surement was carried out and the surface free energy was also calculated from the contact angles of a drop of water on the polymer film.The water contact angles was decreased from 94.5° to 76.5° after the light irradiation.We conclude that the changes in the hydrophilic of LC polymer were influenced by the surface compositions upon the photoinduced reorientation of the azobenzene side groups perpendicularly towards the film surface,which was confirmed by conoscopic POM observation results.
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