膜厚

Abstract(#br)The paper describes a reliable technique to prepare PDMS membrane used to determine the permeability to CO 2 and He. SEM controls morphology of surface membrane and SEM/FIB measures the membrane thickness. The data show that permeability becomes thickness dependent below some tens of micrometers. The Islam׳s model, based on the non-equilibrium sorption–desorption process at the interface, fits quite well with the experimental data. The comparison shows that flux models based on interface reaction could apply to describe quantitatively the thickness-dependence of the permeability.

Effect of Support Resistance ＆ Coating Thickness on Ethylene/Nitrogen Separation of PDMS Composite Membranespolydimethylsiloxane;composite Membrane;resistance model;membrane thickness;ethylene;The effect of porous support layer resistance and PDMS (polydimethylsiloxane) coating thickness on ethylene/nitrogen separation of composite membranes was studied with the model of Pinnau and Wijmans〔1〕. To control the support resistance (or permeance), PES porous membranes were prepared by phase inversion process with various PES/NMP dope concentrations.