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A Robust and Versatile Photoinduced Living Polymerization of Conjugated and Unconjugated Monomers and Its Oxygen Tolerance
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    A Robust and Versatile Photoinduced Living Polymerization of Conjugated and Unconjugated Monomers and Its Oxygen Tolerance
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    † ‡ Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, and Australian Centre for NanoMedicine, School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia
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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2014, 136, 14, 5508–5519
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    https://doi.org/10.1021/ja501745g
    Published April 1, 2014
    Copyright © 2014 American Chemical Society

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    Controlled/living radical polymerization techniques have transformed polymer chemistry in the last few decades, affording the production of polymers with precise control over both molecular weights and architectures. It is now possible to synthesize almost an infinite variety of macromolecules using nonspecialized equipment, finding applications in high-tech industry. However, they have several shortcomings. Until recently, living radical polymerizations could not be controlled by an external stimulus, such as visible light, pH, mechanical, chemical, etc. Moreover, they are usually sensitive to trace amounts of oxygen in the system. In this Article, we report a photoinduced living polymerization technique, which is able to polymerize a large range of monomers, including conjugated and unconjugated monomers, using ultralow concentrations of an iridium-based photoredox catalyst (typically 1 ppm to monomers) and a low energy visible LED as the light source (1–4.8 W, λmax = 435 nm). The synthesis of homopolymers with molecular weights ranging from 1000 to 2 000 000 g/mol was successfully achieved with narrow molecular weight distributions (Mw/Mn < 1.3). In addition, chain extensions of poly(methacrylate)s, poly(styrene), poly(N-vinyl pyrrolidinone), poly(vinyl ester)s, and poly(acrylate)s were performed to prepare diblock copolymers. The reusability of the catalyst was demonstrated by the synthesis of a decablock polymer by multiple chain extensions. Most importantly, this process was employed to prepare well-defined polymers and multiblock copolymers in the presence of air.

    Copyright © 2014 American Chemical Society

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    Experimental details, fluorescence spectrum, UV–vis spectra, NMR spectra, and GPC traces (Figures S1–S34, Tables S1–S6, and Schemes S1–S3). This material is available free of charge via the Internet at http://pubs.acs.org.

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