Synthesis of Polymeric [2]-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. Discrete cyclic polymers can be synthesized via the combination of iterative exponential growth, end-group functionalization and intramolecular cyclization. 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. In this research thiol functional group and pyridyl disulfide functional group were placed into polymer chains to make thiol-disulfide exchange reaction between cyclic polymer and linear polymer. The thiol-disulfide exchange reaction induced a linear chain to thread through cyclic polymer by connecting two polymers, leading to the efficient preparation of polymer catenanes.