孔径是微滤膜最为重要的表征参数之一,直接影响到微滤膜的分离性能.选用聚偏氟乙烯(PVDF)和聚丙烯(PP)材质的中空纤维微滤膜,研究并优化了泡点压力法测定微滤膜最大孔径的检测条件.以乙醇作为润湿剂,在20℃、浸润时间30 min的最佳实验条件下,该方法测定PVDF和PP中空纤维微滤膜最大孔径的相对标准偏差分别为5.4％和8.8％.使用泡点压力法、压汞法和氮气吸附法测定4种不同材质的中空纤维微滤膜孔径特征,结果表明,泡点压力法测得的最大孔径和压汞法测得的平均孔径存在显著的线性相关性,氮气吸附法不适用于微滤膜孔径的测定.
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