气-液置换法测量多孔滤膜孔隙率的方法评价

Method evaluation of porous membrane porosity measurement by gas-liquid displacement method

孔隙率是多孔膜材料的重要技术参数,与其渗透过程密切相关.气-液置换法在常温条件下操作,可测得多孔膜通孔的孔隙率,能准确表征多孔膜的渗透性能.本文阐述了气-液置换法测试多孔膜孔隙率的测试原理和实验方法,并进一步开展了该方法对不同材料膜、不同孔径膜、不同测试液体等普适性和方法精密度、方法比对的评价研究.结果表明,该方法原理科学、操作简单、精密度高,是适用于各种材质、不同种类、不同孔径大小多孔膜孔隙率测试的普适性方法.

Porosity is an important technical parameter of porous membrane materials,which is closely related to its permeation process.The gas-liquid displacement method can be operated at room temperature and measure the through holes porosity of porous membranes,which can accurately characterize the permeability of porous membrane.The testing principle and experimental method of porous membrane porosity test by gas-liquid displacement method have been elaborated.In further,the universality of this method for different material membrane,different pore size membrane and different test liquid,method precision and method comparison have been carried out.The results show that the method is scientific in principle,simple in operation and can be operated simply and has high precision,which is a universal method suitable for the porosity testing of porous membranes of various materials,different types and different pore sizes.