Enhanced stability of photo-induced anisotropy due to intermolecular interactions in an azo-prepolymer confined in block copolymer

► A method to improve the birefringent properties of azo-based materials was studied. ► An epoxy-based azo-prepolymer bearing hydroxyl groups was synthesized. ► The azo-prepolymer was confined in a self-assembled domain of block copolymer. ► Hydrogen bonds formation led to enhancement of birefringence level and stability.