采用湿法相转化和化学亚胺化法制备了聚酰亚胺(PI)超滤膜,并通过正交试验考察制备PI膜的最优化条件.首先合成一定相对分子质量的聚酰胺酸(PAA)粉体,以此为原料控制铸膜液配比制备PAA薄膜,在低温下通过化学亚胺化法制得PI超滤膜.研究了PAA质量分数对铸膜液黏度、膜结构与性能的影响,结果显示,PAA质量分数的增加会导致铸膜液黏度的升高,PI膜通量的下降,截留率的上升.同时,采用正交实验研究了PAA质量分数、PEG质量分数以及PEG相对分子质量这3个因子对膜性能的影响,经过分析最终得出对PI膜的最佳组合为PAA质量分数为15%,PEG质量分数为8%、相对分子质量为2 000.
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