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http://dx.doi.org/10.5764/TCF.2010.22.3.181

Thermo- and Acid/base-induced Spectral Switching of a Poly(N-isopropylacrylamide) Copolymer Containing Benzopyran-based D-π-A type Dye Units  

Lee, Eun-Mi (Department of Advanced Organic Materials Science and Engineering, Kyungpook National University)
Gwon, Seon-Yeong (Department of Advanced Organic Materials Science and Engineering, Kyungpook National University)
Ji, Byung-Chul (Department of Advanced Organic Materials Science and Engineering, Kyungpook National University)
Kim, Sung-Hoon (Department of Advanced Organic Materials Science and Engineering, Kyungpook National University)
Publication Information
Textile Coloration and Finishing / v.22, no.3, 2010 , pp. 181-186 More about this Journal
Abstract
A thermoresponsive poly(NIPAM-co-dye) labeled with benzopyran-based D-$\pi$-A type dye was prepared by typical radical copolymerization. It can be also constructed a acid/base-induced molecular switch by modulation of intramolecular charge transfer with protonation/deprotonation. The lower critical solution temperature behavior was investigated by means of UV-vis spectroscopy which allows the measurement of the phase transition from $25^{\circ}C$ to $45^{\circ}C$ in aqueous DMSO solution. The morphology of the internal microstructure of the poly(NIPAM-co-dye) hydrogel was observed by scanning electron microscopy. The reversible switch could be obtained by thermal and acid/base stimuli.
Keywords
D-$\pi$-A dye; pyran-based dye; poly(N-isopropylacrylamide); switch; lower critical solution temperature(LCST);
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