存储式超疏水透有机物膜的构筑及其环境响应性自修复行为研究

During the long-term organic perm-selective pervaporation process, the wetting phenomenon of the hydrophobic surface usually occurred because of its interaction with the components in the feed. This wetting phenomenon will reduce the life of membrane, leading to restrict its industrial applications. In this subject, self-healing hydrophobic surfaces are constructed by hierarchical porous particles and low surface energy molecules to solve this critical problem, which is based on the existing research on environmental response release capabilities of the porous materials and the study of superhydrophobic surfaces with micro- and nanoscaled hierarchical structure. Therefore, the superhydrophobic surfaces with environmental response and self-healing behavior are expected to obtain for high permeability, selectivity and stability. The self-healing of the superhydrophobic surface is achieved through environmentally responsive release of low surface energy molecules. The effects of interaction between micro- and nanoscaled hierarchical particles and low surface energy molecules on the membrane self-healing behavior are investigated to reveal the mechanism of self-healing and separation.

优先透有机物渗透汽化过程中由于进料液组分与疏水膜表面复杂作用，长久运行使膜表面亲水化，导致渗透汽化膜选择性和渗透性降低，缩短了该类膜的使用寿命，限制了其工业化应用。本研究基于在多孔介质中疏水材料的环境响应释放和已构建微纳超疏水表面的研究结果，针对疏水表面不稳定现象，提出以多级孔微纳结构粒子和低表面能物质协同构建自修复超疏水表面，制备高性能有机物优先透过渗透汽化膜，通过环境响应性释放低表面能物质，达到超疏水膜自修复之目的，实现透醇膜的高渗透、高选择性和长久稳定。系统考察低表面能物质与微纳复合粒子间的物理和化学作用对环境响应性的自修复行为的影响，阐明膜的分离机理和自修复机制。

面向苛刻工业应用体系，制备高性能高稳定性的膜材料具有重要意义。渗透汽化过程中由于进料液组分与膜表面复杂作用，导致渗透汽化膜选择性和渗透性降低，缩短了该类膜的使用寿命。本申请受自然界启发，发展可修复功能的表面,为渗透汽化/有机溶剂纳滤提供了新途径，有望用于解决上述问题。以介孔结构粒子和低表面能物质协同构建自修复超疏水表面，制备高性能有机物优先透过渗透汽化膜，通过环境响应性释放低表面能物质，达到超疏水膜自修复，同时利用介孔作用降低传质阻力，实现有机溶剂纳滤膜的高渗透、高选择性和高稳定性；系统考察了孔径，粒径以及不同分子量的低表面能物质对介孔颗粒的修饰作用，获得疏水膜对于有机溶剂纳滤体系分离机理。面向酸性体系，采用配位螯合作用与氢离子质子化构建酸性体系可修复膜，拓展了自修复膜的应用。