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DDC: 600 × Subject: Ellipsometry ×

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    Cononsolvency Transition of Polymer Brushes: A Combined Experimental and Theoretical Study
    (Basel : MDPI, 2018) Yong, Huaisong; Rauch, Sebastian; Eichhorn, Klaus-Jochen; Uhlmann, Petra; Fery, Andreas; Sommer, Jens-Uwe
    In this study, the cononsolvency transition of poly(N-isopropylacrylamide) (PNiPAAm) brushes in aqueous ethanol mixtures was studied by using Vis-spectroscopic ellipsometry (SE) discussed in conjunction with the adsorption-attraction model. We proved that the cononsolvency transition of PNiPAAm brushes showed features of a volume phase transition, such as a sharp collapse, reaching a maximum decrease in thickness for a very narrow ethanol volume composition range of 15% to 17%. These observations are in agreement with the recently published preferential adsorption model of the cononsolvency effect.