采用热力学相图和超声时域反射法研究了致孔剂聚乙二醇（PEG）对聚偏氟乙烯-g-聚N-异丙基丙烯酰胺（PVDF-g-PNIPAAm）成膜过程的影响。结果表明,在PVDF-g-PNIPAAm/DMF/H2O成膜体系中添加PEG后,促进了成膜体系的分相,体系变得更不稳定。加入PEG后,使得PVDF-g-PNIPAAm/DMF/H2O成膜体系的成膜速度加快,体系更容易发生瞬时液液分相,导致膜孔尺寸增加,纯水通量提高,但温度响应性能不明显。
The influence of pore-forming agent polyethylene glycol(PEG) on poly(vinylidene fluoride) grafting poly(N-isopropylacrylamide)(PVDF-g-PNIPAAm)temperature-sensitive membrane formation mechanism was studied by the phase diagram(thermodynamics)and ultrasonic time-domain reflectometry(kinetics)(UTDR).The results show that the addition of PEG to the casting solution promotes the phase separation process and decreases the thermodynamical stability of the PVDF-g-PNIPAAm/ N,N-dimethylformamide(DMF)/H2O system.The addition of PEG to the casting solution increases the membrane-forming speed and promotes the occurrence of instantaneous phase separation.Adding PEG to the casting solution increases the membrane pore size and water flux,but decreases the temperature-sensitivity.
参考文献
| [1] | Alem H;Duwez AS;Lussis P;Lipnik P;Jonas AM;Demoustier-Champagne S .Microstructure and thermo-responsive behavior of poly (N-isopropylacrylamide) brushes grafted in nanopores of track-etched membranes[J].Journal of Membrane Science,2008(1/2):75-86. |
| [2] | 冯霞,郭艳芬,赵义平,李建新,陈熙,贺晓凌,陈莉.凝固浴温度对PVDF-g-PNIPAAm温度敏感膜成膜过程与性能的影响[J].高等学校化学学报,2011(06):1424-1430. |
| [3] | P. van de Witte;P.J. Dijkstra;J.W.A. van den Berg;J. Feijen .Phase separation processes in polymer solutions in relation to membrane formation[J].Journal of Membrane Science,1996(1/2):1-31. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%