Swelling of a polyelectrolyte brush in humid air
Swelling of a polyelectrolyte brush in humid air
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作者：
Biesalski, M;Rühe, J
我们对与湿空气接触的平面固体表面共价连接的聚电解质刷的膨胀进行了实验研究。在这项研究中使用的膜厚度为几百纳米的聚-N-甲基-[4-乙烯基吡啶]碘化物（MePVP）的单层。通过偶氮引发剂的自组装单层膜和原位自由基链聚合，将MePVP刷附着到硅片表面以及固体基底上的蒸发的氧化硅膜上。通过光波导光谱法（OWS）测量表面结合单层的膜厚度作为环境湿度的函数。的MePVP刷显示出强烈的厚度增加，以及强烈的降低的折射率的表面附着层由于水的掺入所造成的暴露于潮湿的环境。
We present an experimental study on the swelling of polyelectrolyte brushes covalently attached to planar solid surfaces in contact with humid air. Monolayers of poly-N-methyl-[4-vinylpyridinium]iodide (MePVP) with film thicknesses of several hundred nanometers were used in this study. The MePVP brushes were attached to the surfaces of silicon wafers as well as to evaporated silicon oxide films on solid substrates by using self-assembled monolayers of an azo initiator and radical chain polymerization in situ. The film thicknesses of the surface-bound monolayers were measured by optical waveguide spectroscopy (OWS) as a function of the humidity of the environment. The MePVP brushes show strong increases in thickness as well as a strong decrease of the refractive index of the surface-attached layer due to water incorporation caused by the exposure to the humid environment.