Ring-expansion cationic polymerization of vinyl ethers
Cyclic polymers have unique topologies that are free from terminal groups and thus have attracted attention among polymer physicists. In sharp contrast to the conventional macrocyclization approach where telechelic linear polymers depend on highly diluted conditions, "ring-expansion polymerizat...
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| Published in | Polymer chemistry Vol. 8; no. 34; pp. 497 - 4977 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
14.09.2017
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| Online Access | Get full text |
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| Summary: | Cyclic polymers have unique topologies that are free from terminal groups and thus have attracted attention among polymer physicists. In sharp contrast to the conventional macrocyclization approach where telechelic linear polymers depend on highly diluted conditions, "ring-expansion polymerization" is expected to become a useful methodology to construct cyclic polymers efficiently and reliably. However, synthesis of tailor-made cyclic polymers with conventional living polymerization methods are still a challenging subject, especially for addition polymerization of acyclic vinyl monomers. We have recently realized ring-expansion cationic polymerization of vinyl ethers by using a hemiacetal ester embedded cyclic initiator that is easily synthesized. Herein, the unique polymerization is reviewed along with the history of ring-expansion polymerization.
Ring-expansion cationic polymerization of vinyl ethers with a hemiacetal ester-embedded cyclic initiator allows precise syntheses of ring-based architectures due to the controlled propagation as well as the monomer pendant design. |
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| Bibliography: | Makoto Ouchi is an Associate Professor at the Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University. He received his Ph.D. degree from Kyoto University in 2001. After his defence, he joined Toyota Central R&D Labs to develop poly(lactic acid)-based automobile resin. In 2004, he moved to Kyoto University to start his academic carrier as an Associate Professor and was promoted to an Associate Professor in 2010. He concurrently appointed a PRESTO researcher of Japan Science and Technology Agency (JST) for the project of "Molecular Technology" from 2013 to 2017. His current interests include the development of precision polymerizations, particularly sequence-controlled polymerization and ring-expansion polymerization as well as the development of active polymerization catalysts. Mitsuo Sawamoto (b. 1951, Japan) received his B.S. (1974), M.S. (1976), and Ph.D. degrees (1979) in polymer chemistry from Kyoto University. After a postdoctoral research at The University of Akron, U.S.A. (1980-81), he joined the Department of Polymer Chemistry, Kyoto University in 1981 and has been Professor of Polymer Chemistry since 1994. In 2017, he retired from Kyoto and now Professor of the Institute of Science and Technology Research, Chubu University. His research interest includes the development of precision cationic and radical polymerizations and catalysts, the synthesis of designed functional polymers, and most recently the sequence regulation in chain-growth polymerization. Sawamoto has received the Award of The Society of Polymer Science, Japan (1992); the Divisional Research Award of the Chemical Society of Japan (1999); the Arthur K. Doolittle Award of PMSE Division, the American Chemical Society (2002); the Macro Group UK Medal for Outstanding Achievement in Polymer Science, the Royal Society of Chemistry (2012); the SPSJ Award for Outstanding Achievement in Polymer Science and Technology (2013); Alexander von Humboldt Research Award (2016); and Benjamin Franklin Medal in Chemistry (2017); along with the Medal of Honor with Purple Ribbon presented by the Emperor of Japan (2015). Hajime Kammiyada received his Ph.D. degree from Kyoto University in 2017 for his thesis entitled as "Ring-Expansion Cationic Polymerization: A New Precision Polymeriation for Cyclic Polymers" under the supervision of Profs. Makoto Ouchi and Mitsuo Sawamoto. He now works at Asahi Kasei Corporation. |
| ISSN: | 1759-9954 1759-9962 |
| DOI: | 10.1039/c7py00638a |