ABC and ABAB Block Copolymers by Electrochemically Controlled Ring-Opening Polymerization
ABC and ABAB Block Copolymers by Electrochemically Controlled Ring-Opening Polymerization
复制标题
DOI：
10.1021/jacs.1c08648
复制
发表时间：
2021-12-01
影响因子：
15
通讯作者：
Diaconescu, Paula L.
中科院分区：
文献类型：
--
作者：
Hern, Zachary C.;Quan, Stephanie M.;Diaconescu, Paula L.
报道了通过交替 (salfan)Zr((OBu)-Bu-t)(2) (salfan = 1,1'-二(2-叔丁基-6-N-甲基亚甲基苯氧基)二茂铁）的氧化还原态来电化学控制合成多嵌段共聚物。在玻碳工作电极的电化学辅助下，原位电位开关在一锅中改变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-环己烯氧化物-b-丙交酯)。使用该技术生产的聚合物与通过化学氧化还原试剂方法生产的聚合物相似，显示出适度窄的分散度 (1.1-1.5) 和分子量范围为 7 至 26 kDa。
An electrochemically controlled synthesis of multiblock copolymers by alternating the redox states of (salfan)Zr((OBu)-Bu-t)(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, beta-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.