Viscoelastic change of block copolymer ion gels in a photo-switchable azobenzene ionic liquid triggered by light

摘要： A photo-switchable ionic liquid solvent bearing an azobenzene moiety induced a viscoelastic change of block copolymer ion gels by light. ABA triblock copolymers having poly(phenethyl methacrylate) and poly(benzyl methacrylate) as A blocks exhibited opposite photo-induced rheological responses although they had only a tiny structural difference in the alkyl chain length.