温度响应性多孔膜的构建及分离性能研究

Construction of temperature-responsive porous membrane and research on separation performance

通过“graft-to”策略将疏基封端的聚N-异丙基丙烯酰胺(PNIPAM-SH)接枝到涂覆有聚多巴胺(PDA)的聚酯(PET)支撑膜上,制备具有温度响应性的多孔分离膜.通过核磁共振波谱仪(^(1)HNMR)和紫外可见分光光度计(UV-Vis)研究了PNIPAM的结构、相对分子质量等与温度响应性能之间的内在联系.结果表明,以摩尔质量为8400 g/mol的PNIPAM聚合物构筑的多孔膜的温度响应性最为明显,对油水混合物的分离效果最优,达95%以上.制备的膜对水包油乳液也展现出良好的分离性能,有望应用于油水分离领域.

The sulfhydryl-terminated poly(N-isopropylacrylamide)(PNIPAM-SH) was grafted onto a polyester(PET) support membrane coated with polydopamine(PDA) through the "graft-to" strategy to prepare a temperature-responsive porous separation membrane. The internal relationship between the structure, molecular weight of PNIPAM and temperature response performance was studied by nuclear magnetic resonance spectrometer(1HNMR) and ultraviolet-visible spectrophotometer(UV-Vis). The results show that the temperature responsiveness of the porous membrane constructed by the PNIPAM polymer with a molecular weight of 8 400 g/mol is the most obvious, and the separation effect of the oil-water mixture is the best, reaching more than 95%. The prepared membrane also shows good separation performance for oil-in-water emulsions, which can be expected to be applied in the field of oil-water separation.