Construction of cyclic graft copolymers with high graft density via grafting-from approach

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Development of cyclic graft copolymers which have a cyclic backbone and numbers of branches have been examined by means of grafting-from technique. Addition of monomers to cyclic polyanionic macroinitiators allowed grafting of the corresponding polymers from the macroinitiator to generate cyclic graft copolymers. Unimolecular observation technique of the obtained cyclic graft copolymers are as well developed by means of AFM. Further applications of this method to construction of complicated polymer architectures are also demonstrated.