Photoinduced Fe-Based Atom Transfer Radical Polymerization in the Absence of Additional Ligands, Reducing Agents, and Radical Initiators

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• 作者：Xiangcheng Pan ; Nikhil Malhotra ; Jianan Zhang ; Krzysztof Matyjaszewski
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：October 13, 2015
• 年：2015
• 卷：48
• 期：19
• 页码：6948-6954
• 全文大小：426K
• ISSN：1520-5835

文摘

A photoinduced atom transfer radical polymerization (ATRP) of methacrylate with a Fe-based catalytic system was studied in the absence of additional ligands, reducing agents, and radical initiators. Linear semilogarithmic polymerization kinetics and narrow molecular weight distributions were obtained in the presence but also absence of conventional ATRP initiators. The proposed mechanism involves monomer-mediated photoreduction of Fe(III) to Fe(II) but also photoactivation of Fe(II) species. The polymerization was studied with different radiation sources for several methacrylates. The technique was successfully used to synthesize block copolymers, confirming the living nature of ATRP.