Polymer Diffusion on Interfaces and in Porous Media

该项目针对的是界面处和向界面的聚合物链传输。结合我们近年来一直在进行的表面光散射研究和链扩散研究，我们将考察(1)聚合物在空气/水(A/W)界面上的横向扩散，(2)聚合物链在空气/水和油/水(O/W)界面上的吸附动力学，(2)聚合物链在空气/水(A/W)和油/水(O/W)界面上的吸附动力学；并将(3)链扩散研究扩展到多孔介质，如热可逆凝胶和交联凝胶。第一个项目源于我们对各种聚合物在A/W上稳定扩散膜的表面粘弹性参数的研究，因此我们将探讨链传输的微观行为，即高分子链在单层和薄膜中的横向扩散，并将它们与纵向压缩粘度等参数联系起来。第二个问题是，人们可以通过表面光散射和界面消失波荧光的非侵入性光学方法获得高分子链在A/W和O/W上的吸附动力学，从而可以直接探索不同的吸附机理。最后一项旨在对链扩散行为在不同孔径和网络连接的各种凝胶中的行为进行系统化。

This project is directed at polymer chain transport at interfaces and toward interfaces. By combining with surface light scattering studies we have been pursuing in recent years in parallel with the chain diffusion studies, we will examine (1) polymer lateral diffusion on the interface of air/water(A/W); (2) adsorption kinetics of polymer chains onto the interfaces of air/water and oil/water(O/W); and to extend (3) chain diffusion studies to porous media such as thermoreversible and crosslinked gels. The first project is derived from our studies for the surface viscoelastic parameters of stable spread films of various polymers on A/W, and thus we will probe into microscopic behaviors of chain transport, i.e., lateral diffusion of polymer chains in monolayers and thin films, and relate them to a parameter such as the longitudinal compressional viscosity. The second problem is derived from the fact that one gains access to the adsorption kinetics of polymer chains onto A/W amd O/W by non-invasive optical methods of surface light scattering and interface evanescent wave fluorescence whereby different adsorption mechanisms can be probed directly. The last item aims to systematize the chain diffusion behaviors in various gels of different pore sizes and network junctions.