复合纳滤膜的温度敏感性

Thermo-Responsibility of Composite Nanofiltration Membrane

采用界面聚合的方法分别制备了聚哌嗪酰胺(PPA)水凝胶及以PPA为功能层的复合膜。研究表明:(1)聚哌嗪酰胺水凝胶的低临界溶解温度(LCSt)在31.5℃附近,溶胀动力学的研究表明聚哌嗪酰胺水凝胶的溶胀度具有温度敏感性;(2)聚哌嗪酰胺复合膜的截留性能具有温度敏感性,水通量随温度的升高急剧增大,截留率随着温度的升高而略有下降;(3)流动电位法的研究表明聚哌嗪酰胺复合膜表面的Zeta电位随温度的升高其绝对值变小,复合膜表面电性能的变化证明了复合膜截留性能的温度敏感性。

Polypiperazine amide （PPA） hydrogels and the composite membrane with the functional lay of them have been prepared by interracial polymerization, respectively. Polypiperazine amide hydrogels have a lower critical solution temperature （LCST） at 31.5 12. Swelling kinetic studies show tbat the swelling ratios are sensitive to temperature. The rejection performances of the PPA composite membrane show thermo sensitive too. The water flux increases greatly with the temperature increasing, but the rejection decreases with the temperature increasing. The absolute values of the surface zeta potentials of the composite membrane are decreasing with rising temperature, which verify the thermo-responsibility of the rejection performances.