Abstract
AbstractMethacrylate copolymers containing, in side chain azobenzene groupings with heterocyclic sulfonamide substituents: N‐(2,6‐dimethylpyrimidin‐4‐yl)sulfamoyl (sulfisomidine) and N‐(5‐methylisoxazol‐3‐yl) sulfamoyl (sulfamethoxazole) were investigated. The materials undergo reversible trans‐cis isomerisation during illumination with light. This results in changes of dipole moment, polarizability and refractive index. Ellipsometric measurements showed a distinct decreasing refractive index during illumination with light corresponding to absorption band (ca. 450 nm). Depending on the polymer, the change of real part of refractive index in spin‐coated films was between 0.016 and 0.031. The dynamics of growth and decay of refractive index changes, was described by biexponential function approach.
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