https://scholars.lib.ntu.edu.tw/handle/123456789/623921
標題: | A well-defined, versatile photoinitiator (salen)Co-CO2CH3 for visible light-initiated living/controlled radical polymerization | 作者: | Zhao Y. Yu M. Zhang S. Wu Z. Liu Y. Peng C.-H. CHI-HOW PENG |
公開日期: | 2015 | 卷: | 6 | 期: | 5 | 起(迄)頁: | 2979-2988 | 來源出版物: | Chemical Science | 摘要: | The control of the polymerization of a wide range of monomers under mild conditions by a single catalyst remains a major challenge in polymer science. We report a versatile, well-defined organocobalt salen complex to control living radical polymerization of different categories of monomers, including acrylates, acrylamides and vinyl acetate, under visible light irradiation at ambient temperature. Both household light and sunlight were effectively applied in the synthesis of polymers with controlled molecular weights and narrow polydispersities. Narrowly dispersed block copolymers (Mw/Mn < 1.2) were obtained under various conditions. The structures of the polymers were analyzed by 1H NMR, 2D NMR, 13C NMR, GPC, MALDI-TOF-MS and isotopic labeling experiments, which showed that the ω and α ends of the polymer chains were capped with (salen)Co and -CO2CH3 segments, respectively, from the photoinitiator (salen)Co-CO2CH3. The ω end was easily functionalized through oxygen insertion followed by hydrolysis from 18O2 to -18OH. This robust system can proceed without any additives, and offers a versatile and green way to produce well-defined homo and block copolymers. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84928167853&doi=10.1039%2fc5sc00477b&partnerID=40&md5=fa3d6239910aa7db6c1f04d21f265a8b https://scholars.lib.ntu.edu.tw/handle/123456789/623921 |
DOI: | 10.1039/c5sc00477b | SDG/關鍵字: | Additives;Atom transfer radical polymerization;Block copolymers;Light;Living polymerization;Monomers;Nuclear magnetic resonance spectroscopy;Polydispersity;Controlled molecular weight;Isotopic labeling;Living radical polymerization;Living/controlled radical polymerization;Oxygen insertion;Photo-initiator;Single catalyst;Visible-light irradiation;Polyvinyl acetates |
顯示於: | 化學系 |
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