关键词: 温度感应, 开关膜, 接枝率, 开关特性, 渗透性能

Abstract: A series of thermo-responsive gating membranes, with a wide range of grafting yields, were prepared by grafting poly(N-isopropylacrylamide)(PNIPAM) onto porous polyvinylidene fluoride (PVDF) membrane substrates with a plasma-induced pore-filling polymerization method. The effect of grafting yield on gating characteristics of thermo-responsive gating membranes was investigated systematically. The results showed that the grafting yield heavily affected water flux,responsiveness coefficient and thermo-responsive gating factor of membrane pore size. When the grafting yield was smaller than 2.81%, both responsiveness coefficient and thermo-responsive gating factor of pore size increased with increasing grafting yield; however, when the grafting yield was higher than 6.38%, both responsiveness coefficient and thermo-responsive gating factor of membrane pore size were always equal to 1, i.e., no gating characteristics existed. In order to obtain a satisfactory gating property of the membrane, the grafting yield must be kept in a proper range.

Key words: 温度感应, 开关膜, 接枝率, 开关特性, 渗透性能