聚二苯基乙炔耐溶剂纳滤膜的制备与性能

摘要

聚二苯基乙炔(PDPA)不溶于有机溶剂,是理想的新型耐溶剂纳滤膜材料. 采用溶液浇铸法制备聚[1-(4-三甲基硅基)苯基-2-苯乙炔](PTMSDPA)均质膜,经脱硅反应得到PDPA膜,研究其乙醇渗透性能和染料截留性能. 结果表明,乙醇渗透通量与压力呈正相关性,传质机理可能介于孔流机理和溶解扩散机理之间的过渡区. 染料的分子尺寸、电荷性质以及染料和膜之间的相互作用共同影响PDPA膜的截留性能.%Poly(diphenylacetylene)(PDPA) is insoluble in organic solvents which makes it a new type promising membrane material for solvent resistant nanofiltration.PDPA membranes were obtained by desilylation of poly[1-phenyl-2-[p-(trimethylsilyl)phenylacetylene](PTMSDPA) dense membranes, which were prepared by solution-casting method.The permeation of pure ethanol and the retention of dye/ethanol solutions were investigated.The ethanol permeability of the PDPA membrane increases linearly with increased applying pressure.The transport mechanism for solvents in PDPA membrane can fall in the transition range between a pore flow and a solution diffusion mechanism.Moreover, the dye retention of the PDPA membrane is controlled by the molecular size of the dyes, the charge character and interaction between the dyes and the membrane.