naa a22 4500 510819001 CHVBK 20180411083522.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11814-012-0136-7 doi (NATIONALLICENCE)springer-10.1007/s11814-012-0136-7 Photo-responsive microgels composed of polymeric β -cyclodextrin and Tween 20-coumarin conjugate [Elektronische Daten] [Jing Dai, Seung Seo, Jin-Chul Kim] Photo-responsive microgels were prepared by taking advantage of the interaction between Tween 20-coumarin conjugate (TCC) and polymeric β-cyclodextrin (PβCD). TCC was prepared by covalently attaching coumarin to the hydroxyl group of the head (PEO segment) of Tween 20. The molar ratio of coumarin residue and Tween 20 was 1: 1, determined on the 1H NMR spectrum. PβCD was prepared by reacting epichlorohydrins (EPI) with the hydroxyl groups of βCDs. The primary hydroxyl groups participated in the polymerization reaction, evidenced by the 13C NMR spectrum. The CD content in PβCD, determined by a colorimetric method, was 37.4%. Microgels were prepared by adding TCC to the aqueous solution PβCD (20%, w/v) so the molar ratio of TCC to βCD residue was 0.72: 1. The shape was spherical on SEM photo and optical microscopic photo, and the diameter, measured on light scattering equipment, was a few micrometers. The size dramatically decreased by the irradiation of λ at 365 nm, possibly due to the photo-dimerization of coumarin residue of TCC. Thr size of the photo-treated microgel markedly increased by the irradiation of λ at 254 nm, possibly due to the de-dimerization of the coumarin residue dimers. Korean Institute of Chemical Engineers, Seoul, Korea, 2012 Coumarins nationallicence Tween 20 nationallicence Polymeric β -Cyclodextrin nationallicence Photo-responsive Microgel nationallicence Dai Jing College of Biomedical Science and Institute of Bioscience and Biotechnology, Kangwon National University, 192-1, Hyoja-2dong, Chuncheon, 200-701, Gangwon-do, Korea aut Seo Seung College of Biomedical Science and Institute of Bioscience and Biotechnology, Kangwon National University, 192-1, Hyoja-2dong, Chuncheon, 200-701, Gangwon-do, Korea aut Kim Jin-Chul College of Biomedical Science and Institute of Bioscience and Biotechnology, Kangwon National University, 192-1, Hyoja-2dong, Chuncheon, 200-701, Gangwon-do, Korea aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/1(2013-01-01), 245-250 0256-1115 30:1<245 2013 30 11814 https://doi.org/10.1007/s11814-012-0136-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-012-0136-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dai Jing College of Biomedical Science and Institute of Bioscience and Biotechnology, Kangwon National University, 192-1, Hyoja-2dong, Chuncheon, 200-701, Gangwon-do, Korea aut NATIONALLICENCE 700 1- Seo Seung College of Biomedical Science and Institute of Bioscience and Biotechnology, Kangwon National University, 192-1, Hyoja-2dong, Chuncheon, 200-701, Gangwon-do, Korea aut NATIONALLICENCE 700 1- Kim Jin-Chul College of Biomedical Science and Institute of Bioscience and Biotechnology, Kangwon National University, 192-1, Hyoja-2dong, Chuncheon, 200-701, Gangwon-do, Korea aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/1(2013-01-01), 245-250 0256-1115 30:1<245 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer