Correlation between mobility, ion concentration profile and swelling behavior of polymer films in the interphase close to solid substrates

本项目重点研究厚度在1 nm至1µm之间的聚合物薄膜中膜体（连续体）与固体衬底之间的界面相的研究和控制。作为一个模型系统，我们研究了聚电解质多层膜，它是由水溶液中聚阴离子和聚阳离子交替吸附而形成的。由于聚阴离子层和聚阳离子层彼此之间是强交叉的，多层可以看作是一个聚合物相。制备不同数量的多层吸附层，使他们有机会以亚纳米尺度的分辨率扫描聚合物迁移率和密度等特性。在第一个阶段，我们重点研究了结构剖面和在水中的膨胀行为。特别是考虑了离子特异性效应。在第二阶段，我们将研究聚合物薄膜的结构轮廓、（粘）弹性和动力学之间的关系。通过使用不同表面粗糙度和电荷的材料以及不同的预涂层来研究基材对疏水性的影响。

The project focuses on the study and control of the interphase between film bulk (continuum) and solid substrate in polymer films with a thickness between 1 nm and 1µm. As a model system we study polyelectrolyte multilayers, which are formed by alternating adsorption of polyanions and polycations from aqueous solutions. Since the polyanion and polycation layers are strongly interdigitated with each other the multilayers can be considered as one polymer phase. The preparation of multilayers of different numbers of adsorbed layers gives them the opportunity to scan properties like polymer mobility and density with a resolution on a sub–nm scale. In the first period we focused on the structure profile and the swelling behavior in water. Especially, ion specific effects were taken into account. In the second period we will study the correlation between structure profile, (visco)elasticity and dynamics within the polymer films. The effect of substrate will be studied by using materials of different surface roughness and charge and different pre–coatings with respect to hydrophobicity.