Star Synthesis Using Macroinitiators via Electrochemically Mediated Atom Transfer Radical Polymerization

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• 作者：Sangwoo Park ; Hong Yul Cho ; Katarzyna Barbara Wegner ; Joanna Burdynska ; Andrew J. D. Magenau ; Hyun-jong Paik ; Stefan Jurga ; Krzysztof Matyjaszewski
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：August 13, 2013
• 年：2013
• 卷：46
• 期：15
• 页码：5856-5860
• 全文大小：344K
• 年卷期：v.46,no.15(August 13, 2013)
• ISSN：1520-5835

文摘

Electrochemically mediated atom transfer radical polymerization (eATRP) was investigated for synthesis of star polymers using macroinitiators (MIs), achieving high star yield with low Cu catalyst loading (100 ppm, w/w). The arm first method, using MIs, is one of the most robust procedures for star polymer synthesis. During the polymerization, MIs can react with cross-linkers (divinyl or multivinyl compounds) for initial chain extension followed by the cross-linking reaction. The MIs can be transformed to arms of the star, and the cross-linker can form the star core. In this study, poly(ethylene oxide) (PEO, M_n = 2000) based MIs (PEO MIs) were prepared, and the chain-end functionalities were confirmed by ¹H NMR analysis. The ATRP functionalized PEO MIs were then used for the star synthesis by reacting with ethylene glycol diacrylate cross-linkers. Various experimental conditions were conducted for optimizing star formation, including MI concentration, MI to cross-linker molar ratio, and applied potential (E_app).