Measurement of Porous Membrane Porosity by Gas-Liquid Displacement Method
Porosity is an important pore performance parameter of porous membranes.The current standard test method has some limitations in applicability,and can not accurately characterize the permeability of separation membranes.The gas-liquid displacement method can be completed at normal temperature conditions.When used for porosity testing,the porosity of through holes of porous membranes can be obtained.The testing principle,experimental method and testing conditions of porous membrane porosity test by gas-liquid displacement method had been systematically studied and elaborated in this paper.The method precision and method comparison had been carried out.The results showed that the process of pressure boost was the key control condition of porosity measurement by gas-liquid displacement method.The end point was when the wet curve changed from a steep rising curve to a gentle rising straight line.This method is scientific in principle,simple in operation and has high precision,which test results can accurately characterize the permeability of porous membranes.
国家科技期刊平台
NSTL
万方数据
维普
