期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 47, 页码 14584-14589出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201607169
关键词
cyclopolymerization; lower critical solution temperature (LCST); methacrylic acid; radical polymerization; vinyl
资金
- Precursory Research for Embryonic Science and Technology (PRESTO) from Japan Science and Technology Agency (JST)
- Strategic International Collaborative Research Program (SICORP) from The French National Research Agency (ANR)
- JST
- KAKENHI [15H03816]
- Grants-in-Aid for Scientific Research [15K13707, 15H03816] Funding Source: KAKEN
By utilizing features of the hemiacetal ester (HAE) bond: easy formation from vinyl ether and carboxylic acid and easy cleavage into different functional groups (-COOH and -OH), we achieved control of the alternating sequence of two functional pendant groups of a vinyl copolymer. Methacrylateand acrylate-based vinyl groups were connected through HAE bonds to prepare a cleavable divinyl monomer, which was cyclo-polymerized under optimized conditions in a ruthenium-catalyzed living radical polymerization. Subsequent cleavage of the HAE bonds in the resultant cyclo-pendant led to a copolymer consisting of alternating methacrylic acid and 2-hydroxyethyl acrylate units as analyzed by C-13 NMR spectroscopy. The alternating sequence of -COOH and -OH pendants specifically provided a lower critical solution temperature (LCST) in an ether solvent, which was not observed with the random copolymer of same composition ratio.
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