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Janus Effect of Lewis Acid Enables One-Step Block Copolymerization of Ethylene Oxide and N-Sulfonyl Aziridine |
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| Authors: | Dr. Qilei Song Hong Qiu Lijun Liu Prof. Dr. Guangzhao Zhang Prof. Dr. Frédéric Peruch Prof. Dr. Stéphane Carlotti Prof. Dr. Junpeng Zhao |
| Affiliation: | 1. Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640 China Bordeaux INP, Univ. Bordeaux CNRS, LCPO, UMR 5629, 33600 Pessac, France These authors contributed equally to this work.;2. Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640 China These authors contributed equally to this work.;3. Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640 China;4. Bordeaux INP, Univ. Bordeaux CNRS, LCPO, UMR 5629, 33600 Pessac, France |
| Abstract: | One-step sequence-selective block copolymerization requires stringent catalytic control of monomers relative activity and enchainment order. It has been especially rare for AnBm-type block copolymers from simple binary monomer mixtures. Here, ethylene oxide (EO) and N-sulfonyl aziridine (Az) compose a valid pair provided with a bicomponent metal-free catalyst. Optimal Lewis acid/base ratio allows the two monomers to strictly block-copolymerize in a reverse order (EO-first) as compared with the conventional anionic route (Az-first). Livingness of the copolymerization facilitates one-pot synthesis of multiblock copolymers by addition of mixed monomers in batches. Calculation results reveal that a Janus effect of Lewis acid on the two monomers is key to enlarge the activity difference and reverse the enchainment order. |
| Keywords: | Aziridine Block Copolymer Epoxide Ring-Opening Polymerization |