以N-异丙基丙烯酰胺(NIPAAm)为单体,合成了NIPAAm均聚凝胶。研究了25℃时它们在乙醇水溶液中的溶胀平衡。实验发现;当乙醇浓度约为12％时,少量乙醇的进一步加入将使溶涨的凝胶突然剧烈收缩,表明NIPAAm凝胶在乙醇水溶液中有不连续体积相变。随着乙醇不断加入,凝胶又重新溶涨。结合“自由体积”概念,利用UNIQUAC模型的关联和预报了NIPAAm凝胶在乙醇-水溶液中的这种溶涨行为。 With N-isopropylacrylamide (NIPAAm) as monomer, a NIPAAm homopolymeric gel was synthesized. Their swelling balance in aqueous ethanol at 25 ° C was studied. Experiments show that when ethanol concentration is about 12%, the further addition of a small amount of ethanol will suddenly and drastically shrink the swollen gel, indicating that NIPAAm gel has a discontinuous volume transformation in aqueous ethanol solution. With the constant addition of ethanol, the gel swelled again. In conjunction with the concept of “free volume”, this lysis behavior of NIPAAm gel in ethanol-water solution was predicted by using the UNIQUAC model.