Effective synthesis of polymer catenanes composed of interlocked discrete cyclic polymers
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Cyclic polymers have been extensively studied because of their unique physicochemical properties originated from their endless ring conformation. We recently synthesized discrete cyclic polymers and block copolymers via the combination of iterative exponential growth, end-group functionalization and intramolecular cyclization. The studies on cyclic polymers without trace amounts of linear contaminants were performed to provide fundamental insights into the chemical and physical properties. In addition, polymer catenanes, composed of interlocked cyclic polymers, were prepared by the template threading approach. Using the linear convergent method, functional monomers were precisely placed into polymer chains to make use of intermolecular interactions as a binding force. The binding interactions induced a linear chain to thread through cyclic polymer, leading to the efficient preparation of polymer catenanes.