新型耐高温聚酰胺复合纳滤膜的制备及性能研究

Study on the preparation and performance of novel thermal stable poly(piperazine-amide) composite nanofiltration membranes

以耐高温的杂萘联苯聚芳醚超滤膜为基膜，通过哌嗪（PIP）与均苯三甲酰氯（TMC）的界面聚合反应制备了复合纳滤膜。研究了界面聚合条件对膜性能的影响；利用扫描电镜（SEM）和原子力显微镜（AFM）分析了膜表面形貌，并用统计法计算了膜表面粗糙度；考察了操作条件对膜性能的影响，及膜对染料和无机盐的分离性能。结果表明，所制备的复合膜具有良好的热稳定性，在1．0MPa，80℃下对Na2SO；的截留率保持在96％以上，而通量高达400L／（m^2·h）。在1．0MPa，60℃下复合膜对低分子染料的截留率较高，且通量达到180～210L／（m^2·h），对NaCl的截留率低于20％。

Novel thermal stable composite nanofiltration membranes were prepared through the interracial polymerization of piperazine and trimesoyl chloride on poly（phthalazinone ether） ultrafiltration substrate. The effects of polymerization and testing conditions on membrane performance were studied. The surface morphologies of the substrate and the composite membranes were observed through SEM and AFM. And the separation properties of the membranes for dyes and salt were tested. The composite membranes showed good thermal stability. The rejection for Na2SO4 was kept over 96% ,while the flux reached 400L/（m^2 · h） when tested at 1.0MPa, 80℃. When tested at 1.0MPa,60℃ ,the rejection of the composite membrane for dyes was kept at high level,and the flux reached 180-210L/（m^2 · h）,while the rejection for NaCl was lower than 20%.