BK21 FTIT Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Jun 15;92:33-6. doi: 10.1016/j.saa.2012.02.035. Epub 2012 Feb 19.
Temperature and pH responsive poly(N-isopropylacrylamide) (poly(NIPAM)) copolymer containing D-π-A type pyran-based fluorescent dye (fluorophore) and basic comonomer, N-[3-(dimethylamino)propyl]-methacrylamide (DMAPAM) was prepared by free radical polymerization. With increase of pH values, aqueous poly(NIPAM-co-DMAPAM-co-fluorophore) solution showed decrease of a lower critical solution temperature (LCST) and increase of fluorescence intensity, due to a change in the ionization state. And also hydrodynamic radius of poly(NIPAM-co-DMAPAM-co-fluorophore) changed correspondingly to changes of temperature and pH values.
温度和 pH 值响应型聚（N-异丙基丙烯酰胺）（poly（NIPAM））共聚物，其中含有 D-π-A 型吡喃基荧光染料（荧光团）和碱性单体 N-[3-（二甲氨基）丙基]-甲基丙烯酰胺（DMAPAM），是通过自由基聚合制备的。随着 pH 值的增加，聚（NIPAM-co-DMAPAM-co-荧光团）水溶液的低临界溶液温度（LCST）降低，荧光强度增加，这是由于其离子化状态发生了变化。同时，聚（NIPAM-co-DMAPAM-co-荧光团）的水动力半径也相应地随温度和 pH 值的变化而变化。
