【摘 要】
：
Anionic ring-opening polymerization(AROP)of N-sulfonyl aziridines is an important synthetic route to linear poly-ethyleneimine(PEI)and its derivatives.In most cases,inert atmosphere and dry solvent were needed because of the oxygen-and water-sensitive ini
【机 构】
：
School of Chemistry and Chemical Engineering,Frontiers Science Center for Transformative Molecules,S
论文部分内容阅读
Anionic ring-opening polymerization(AROP)of N-sulfonyl aziridines is an important synthetic route to linear poly-ethyleneimine(PEI)and its derivatives.In most cases,inert atmosphere and dry solvent were needed because of the oxygen-and water-sensitive initiators/catalysts used.Therefore,the AROP of N-sulfonyl aziridines that can be entirely operated in air atmosphere is still a challenging task.Herein,we report a series of sulfanions,including xanthates,dithiocarbamates,dithio-benzoates,thioacetates,and thiolates,as the initiators for the AROP of N-sulfonyl aziridines.Due to their good stability,open-vessel polymerization was achieved with high livingness,affording a range of well-defined α-,ω-telechelic poly(N-sulfonyl aziridine)homopolymers and block copolymers with narrow dispersities and tunable molecular weights.The α-end group of these polyaziridines was readily converted to thiol group,which enabled further post-polymerization functionalization with benzyl acrylate and poly(ethylene glycol)via thiol-ene click chemistry.The establishment of open-vessel sulfanion-initiated AROP of N-sulfonyl aziridines thus lays a solid foundation for the bulk preparation and application of poly(N-sulfonyl aziridine)s and PEI derivatives.
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