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In this context, considerable efforts have been made on the development of various synthetic methods, including “click” reactions 4, 5, sequential monomer addition 6, 7, 8, and solid-phase synthesis 9, 10, 11. High monomer-sequence regulation enables effective control of structure–property relations of copolymers so that precise sequence-controlled polymers may be endowed with novel properties or functions 1, 2, 3.
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This method shows considerable promise in the synthesis of sequentially and architecturally complex polymers, with high monomer sequence control that provides the potential for designing materials.Ĭopolymers are long macromolecular chains composed of at least two monomers of different chemical natures. Following this autotandem catalysis, reasonable combinations of different catalytic cycles allow the direct preparation of diverse, sequence-controlled, multiblock copolymers even containing various hyperbranched architectures. Without an external trigger, the catalyst polymerization spontaneously connects five catalytic cycles in an orderly manner, involving four anhydride/epoxide ring-opening copolymerizations and one L-lactide ring-opening polymerization, creating a one-step synthetic pathway. Herein, we report a self-switchable polymerization enabled by simple alkali metal carboxylate catalysts that directly polymerize six-component mixtures into multiblock polymers consisting of up to 11 blocks. To date, this method has been limited to three-component systems, which enables the straightforward synthesis of multiblock polymers with less than five blocks. Switchable polymerization holds considerable potential for the synthesis of highly sequence-controlled multiblock.