An Oxygen Paradox: Catalytic Use of Oxygen in Radical Photopolymerization. Issue 47 (11th October 2019)

• Record Type: Journal Article
• Authors: Zhang, Liwen; Wu, Chenyu; Jung, Kenward; Ng, Yun Hau; Boyer, Cyrille
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 47(2019)
• Page Start: 16811
• Page End: 16814
• Publication Date: 2019-10-11
• Subjects: controlled/living radical polymerization -- far red light -- oxygen tolerance -- PET-RAFT; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201909014
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: A peculiar radical polymerization reaction is presented in which oxygen serves as a cocatalyst, alongside triethylamine, to provide activation with light in the far‐red (690 nm, 3 mW cm −2 ) of the PET‐RAFT process in the presence of zinc(II) (2, 3, 7, 8, 12, 13, 17, 18‐octaethyl‐5, 10, 15, 20‐tetraphenylporphyrin) as photocatalyst. Apart from the ability to exert temporal control by switching the light on or off, this system possesses the exciting capability of inducing temporal control by removal or reintroduction of oxygen. Furthermore, this multicomponent catalytic system was typified by controlled polymerizations of various acrylate and acrylamide monomers, which all resulted in well‐defined polymers with low dispersity (<1.2). The process displayed excellent living characteristics that were demonstrated through chain extensions and a range of degrees of polymerization (200–1600). Abstract : A peculiar radical polymerization reaction is presented in which oxygen serves as a cocatalyst alongside triethylamine. This enables far‐red activation of the PET‐RAFT process in the presence of zinc(II) (2, 3, 7, 8, 12, 13, 17, 18‐octaethyl‐5, 10, 15, 20‐tetraphenylporphyrin) as photocatalyst.