ABC and ABAB Block Copolymers by Electrochemically Controlled Ring-Opening Polymerization,Journal of the American Chemical Society

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ABC and ABAB Block Copolymers by Electrochemically Controlled Ring-Opening Polymerization
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-11-18 , DOI: 10.1021/jacs.1c08648
Zachary C Hern ₁ , Stephanie M Quan ₁ , Ruxi Dai ₁ , Amy Lai ₁ , Yihang Wang ₁ , Chong Liu ₁ , Paula L Diaconescu ₁

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An electrochemically controlled synthesis of multiblock copolymers by alternating the redox states of (salfan)Zr(O^tBu)₂ (salfan = 1,1′-di(2-tert-butyl-6-N-methylmethylenephenoxy)ferrocene) is reported. Aided by electrochemistry with a glassy carbon working electrode, an in situ potential switch alters the catalyst’s oxidation state and its subsequent monomer (l-lactide, β-butyrolactone, or cyclohexene oxide) selectivity in one pot. Various multiblock copolymers were prepared, including an ABAB tetrablock copolymer, poly(cyclohexene oxide-b-lactide-b-cyclohexene oxide-b-lactide), and an ABC triblock copolymer, poly(hydroxybutyrate-b-cyclohexene oxide-b-lactide). The polymers produced using this technique are similar to those produced via a chemical redox reagent method, displaying moderately narrow dispersities (1.1–1.5) and molecular weights ranging from 7 to 26 kDa.

中文翻译：

电化学控制开环聚合制备 ABC 和 ABAB 嵌段共聚物

报道了通过交替 (salfan)Zr(O ^t Bu) ₂ (salfan = 1,1'-di(2- tert -butyl -6- N -methylmethylenephenoxy)ferrocene) 的氧化还原状态来电化学控制合成多嵌段共聚物。在具有玻璃碳工作电极的电化学辅助下，原位电位开关在一锅中改变了催化剂的氧化态及其后续单体（L-丙交酯、β-丁内酯或环己烯氧化物）的选择性。制备了各种多嵌段共聚物，包括 ABAB 四嵌段共聚物、聚（环己烯氧化物-b-丙交酯-b-环己烯氧化物-b-丙交酯）和ABC三嵌段共聚物聚（羟基丁酸酯-b-环氧环己烯-b-丙交酯）。使用这种技术生产的聚合物与通过化学氧化还原试剂法生产的聚合物相似，具有中等窄的分散性 (1.1–1.5) 和 7 至 26 kDa 的分子量。

更新日期：2021-12-01

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