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 °C、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四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。

Pore size is one of the most important characterization parameter, which directly affects the membrane separation performance. Bubble-point method for analysis of maximum pore diameter of hollow fiber microfiltration membrane was investigated in this study. With polyvinylidene fluoride (PVDF) and polypropylene (PP) microfiltration membrane as the representative examples, the detection conditions were optimized. Optimum bubble-point method was carried out at a temperature of 20 °C for 30 min by using ethanol as the soaking liquid. The relative standard deviations of maximum pore diameter were 5.4% and 8.8% for PVDF and PP microfiltration membrane, respectively. Pore sizes of four hollow fiber microfiltration membranes were determined by bubble-point, mercury porosimetry, and gas adsorption methods, respectively. The results showed that the maximum pore diameters obtained by bubble-point method were strongly correlated with the average pore diameters obtained by mercury porosimetry method. Gas adsorption method was not suitable for the pore size analysis of microfiltration membranes.

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