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

本项目致力于研究和控制厚度在1 nm到1µm之间的聚合物薄膜中膜块(连续体)和固体衬底之间的界面相。作为一个模型系统，我们研究了由水溶液中的聚阴离子和聚阳离子交替吸附形成的聚电解质多层膜。由于聚阴离子和聚阳离子层相互强烈地相互交错，所以多层膜可以被认为是一个聚合物相。不同吸附层数的多层膜的制备使他们有机会以亚纳米级的分辨率扫描聚合物的流动性和密度等属性。在第一阶段，我们重点研究了其结构特征和在水中的溶胀行为。特别是考虑了离子的特殊效应。在第二阶段，我们将研究聚合物薄膜内部结构轮廓、(粘弹性)和动力学之间的相关性。通过使用不同表面粗糙度和电荷的材料以及不同的预涂覆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.