高分子微滤膜等离子体处理接枝N-异丙基丙烯酰胺

用低温等离子体预处理的方法，将N-异丙基丙烯酰胺(NIPAAm)接技在PE微滤膜上。研究了等离子体处理工艺、接枝聚合条件对接枝率的影响，结果表明，等离子体处理产生的活性种具有长寿命，水对接枝聚合反应具有加速效应。SEM观察到接枝膜表面存在接枝物。接枝膜的水通量在32℃附近出现了不连续的变化，聚(N-异丙基丙烯酰胺)(PNIPAAm)接枝链起到了化学阀的作用．

PREPARATION OF STIMULI-RESPONSIVE MEMBRANE BY PLASMA GRAFT POLYMERIZATION OF POLY(N-ISOPROPYLACRYLAMIDE) ONTO PE MEMBRANE

Temperature stimuli-responsive membranes were prepared through plasma-induced graft polymerization of N-isopropylacrylamide(NIPAAm) onto porous polyethylene(PE) membranes. The effects of graft conditions, such as plasma exposure power, exposure time, monomer concentration, post-polymerization time, and solvents applied, on the grafting amount were determined. The active species induced by plasma exposure tended to be long-living by a post-polymerization period of 95 h. Water showed a much higher polymerization rate than methanol. The grafted PNIPAAm was observed to be located on the external surface of the membrane by SEM. Water permeability of the grafted membrane varied dramatically by a slight temperature change around the LCST(lower-critical solution temperature), which showed that the grafted PNIPAAm acted as a chemical valve.