Polyurethane-epoxy based azopolymers: Influence of chemical structure over photoinduced birefringence

Photoinduced anisotropy (Δn), remnant birefringence (RB) and dichroism were measured for the resulting polymers and evaluated as function of their Tgs and chemical structures. Final materials exhibited very high values of Δn and RB being promised materials for using in optical storage information devices.