Controlled Radical Polymerization of Acrylates Regulated by Visible Light

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• 作者：Nicolas J. Treat ; Brett P. Fors ; John W. Kramer ; Matthew Christianson ; Chien-Yang Chiu ; Javier Read de Alaniz ; Craig J. Hawker
• 刊名：ACS Macro Letters
• 出版年：2014
• 出版时间：June 17, 2014
• 年：2014
• 卷：3
• 期：6
• 页码：580-584
• 全文大小：262K
• 年卷期：v.3,no.6(June 17, 2014)
• ISSN：2161-1653

文摘

The controlled radical polymerization of a variety of acrylate monomers is reported using an Ir-catalyzed visible light mediated process leading to well-defined homo-, random, and block copolymers. The polymerizations could be efficiently activated and deactivated using light while maintaining a linear increase in molecular weight with conversion and first order kinetics. The robust nature of the fac-[Ir(ppy)₃] catalyst allows carboxylic acids to be directly introduced at the chain ends through functional initiators or along the backbone of random copolymers (controlled process up to 50 mol % acrylic acid incorporation). In contrast to traditional ATRP procedures, low polydispersity block copolymers, poly(acrylate)-b-(acrylate), poly(methacrylate)-b-(acrylate), and poly(acrylate)-b-(methacrylate), could be prepared with no monomer sequence requirements. These results illustrate the increasing generality and utility of light mediated Ir-catalyzed polymerization as a platform for polymer synthesis.