Yong Huaisong, Rauch Sebastian, Eichhorn Klaus-Jochen, Uhlmann Petra, Fery Andreas, Sommer Jens-Uwe
Leibniz-Institut für Polymerforschung Dresden e.V., 01069 Dresden, Germany.
Institute of Physical Chemistry of Polymeric Materials, Technische Universität Dresden, 01062 Dresden, Germany.
Materials (Basel). 2018 Jun 11;11(6):991. doi: 10.3390/ma11060991.
In this study, the cononsolvency transition of poly(-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.
在本研究中，通过使用结合吸附-吸引模型讨论的可见光谱椭圆偏振仪（SE），研究了聚（N-异丙基丙烯酰胺）（PNiPAAm）刷在乙醇水溶液混合物中的共溶剂化转变。我们证明，PNiPAAm刷的共溶剂化转变表现出体积相变的特征，例如急剧塌陷，在15%至17%的非常窄的乙醇体积组成范围内厚度达到最大减小。这些观察结果与最近发表的共溶剂化效应的优先吸附模型一致。
