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通过结合嵌段共聚物自组装与非溶剂致相分离法,制备了上表面为高规整纳米直孔薄层,内部为双连续大孔支撑层的非对称薄膜结构,并考察了铸膜液浓度、溶剂挥发时间、凝固浴温度、刮膜厚度等因素对膜形貌的影响,实现对表面结构的有效调控.研究表明铸膜液浓度与挥发时间的影响有协同效应,随着铸膜液浓度的升高,规整表面孔结构所需的挥发时间减小.若铸膜液浓度不变,挥发时间的增大可使膜表面依次完成从非规整孔、规整柱状孔,再到层状孔的转变.凝固浴温度的降低有利于规整表面结构的形成.当刮膜厚度降低时,原有操作条件下的膜表面形貌形成规律将不再适用,为制备更薄的规整纳米多孔薄膜,需降低挥发时间或采用溶剂退火的方法,这一发现扩展了此类新型薄膜材料制备过程的可操作空间.
By combining the block copolymer self-assembly and nonsolvent induced phase separation method, an asymmetric thin film structure with a highly regular nano-hole layer on the upper surface and a double continuous macroporous support layer on the surface was prepared. The effects of casting solution concentration , Solvent evaporation time, the temperature of the coagulation bath, the thickness of the film and other factors on the film morphology, to achieve effective regulation of the surface structure.The results show that the casting solution concentration and volatilization time have a synergistic effect, with the casting solution concentration Of the surface structure of the desired evaporation time decreases.If the concentration of the casting solution unchanged volatilization time can make the membrane surface sequentially from non-regular hole, regular columnar hole, and then to the layered hole Changes in the coagulation bath temperature is conducive to the formation of structured surface structure.When the film thickness decreases, the original operating conditions of the membrane surface morphology will no longer apply, in order to prepare thinner structured nanoporous film The discovery of either a reduction in volatility time or a solvent anneal extends the operational space for the preparation of such new thin film materials.