Polymer Diffusion on Interfaces and in Porous Media

界面和多孔介质中的聚合物扩散

• 批准号: 8903943
• 负责人: Hyuk Yu
• 金额: $ 32.62万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-06-15 至 1992-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8903943&HistoricalAwards=false
• 关键词: Polymer; Diffusion; Interfaces; Porous; Media

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.

这个项目是针对聚合物链在界面和向界面的传输。结合近年来与链扩散研究并行进行的表面光散射研究，我们将研究(1)聚合物在空气/水界面（A/W）上的横向扩散；(2)聚合物链在空气/水和油/水界面（O/W）上的吸附动力学；并将(3)链扩散研究扩展到多孔介质，如热可逆和交联凝胶。第一个项目来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，即聚合物链在单层和薄膜中的横向扩散，并将其与纵向压缩粘度等参数联系起来。第二个问题源于通过表面光散射和界面倏逝波荧光的非侵入性光学方法获得聚合物链在A/W和O/W上的吸附动力学，从而可以直接探测不同的吸附机制。最后一个项目旨在系统化不同孔径和网络连接的凝胶中的链扩散行为。