具有图灵结构的聚苯并咪唑耐溶剂纳滤膜的制备及性能

Preparation and Performance of Turing Structured Polybenzimidazole Solvent-resistant Nanofiltration Membrane

以聚苯并咪唑(PBI)为原料,采用配位诱导相转化法制备具有图灵结构的纳滤膜.通过改变聚合物的含量调控图灵膜的形貌,探究图灵膜的纳滤性能,并对图灵膜在有机溶剂中的稳定性进行测试.使用光学显微镜(OM)、扫描电子显微镜(SEM)及傅里叶变换红外光谱仪(FTIR)等对制备的图灵膜的表面形貌及结构进行表征.首次将配位诱导相转化法制备的图灵膜应用于耐溶剂纳滤中.研究结果表明:制备的图灵膜具有优异的纳滤性能和溶剂稳定性,该膜对玫瑰红(RB)、溴百里香酚蓝(BTB)及亚甲基蓝(MB)的截留率均可达到99%以上,在强极性溶剂N,N-二甲基甲酰胺(DMF)中过滤时间长达40 h时,对RB的截留率仍达到86.66%以上,在耐溶剂纳滤(SRNF)中具有良好的应用前景.

Polybenzimidazole(PBI)was used as raw material to prepare nanofiltration membrane with turing structure by coordination induced phase inversion method in this paper.The morphology of turing membrane was controlled by changing the content of polymer.The nanofiltration performance of turing membrane was investigated and the stability of turing membrane in organic solvents was tested.The surface morphology and structure of the prepared Turing films were characterized by optical microscopy(OM),scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR).For the first time,the Turing membrane prepared by coordination induced phase inversion method was used in solvent resistant nanofiltration.The results showed that the turing membrane exhibited excellent nanofiltration performance and good solvent resistance.The rejection of rose red(RB),bromothymol blue(BTB)and methylene blue(MB)could reach more than 99%.In the strong polar solvent N,N-dimethylformamide(DMF),when the filtration time was up to 40 h,the retention rate of RB was still above 86.66%,showing a good application prospect in solvent resistant nanofiltration.