Syntheses and optical properties of polyesters with disperse red 19 by the polycondensation reaction

We synthesized the polyesters containing azobenzene units in the side chain for data storage materials. The structurally similar polyesters, DR-Est-1, DR-Est-2 and DR-Est-3 were synthesized to compare the optical properties of polyesters with different structure from dihalide in the main chain. The diffraction efficiencies of films were measured as a function of the reaction time. Typically, the diffraction efficiency of the DR-Est-3 film prepared from 4,4'-biphenyldicarbonyl chloride was observed up to a level of 0.4%.