Regulating Pore\nIntrusion in PDMS/PSF Composite Membrane\nFormation for Enhanced O<sub>2</sub>/N<sub>2</sub> Separation

Although pore intrusion can cause defects in the selective\nlayer,\nit can improve the interface adhesion between the selective layer\nand the support layer. Consequently, a novel strategy for a controlled\npore intrusion depth has been proposed for the first time. In this\nwork, pore intrusion was regulated by the addition of glycerol, DI\nwater, or paraffin oil as a prewetting agent to a support to prepare\npoly(dimethylsiloxane) (PDMS)/polysulfone (PSF) composite membranes.\nWe found that the pore intrusion depth was proportional to the curing\nrate of PDMS. The prewetting agent demonstrated a greater affinity\nfor the support, and a high boiling point was beneficial in alleviating\npore intrusion. The properties of the support could affect the gas\npermeance. The PDMS/PSF composite membrane with different pore intrusion\ndepths could be prepared by changing the extraction time of the support.\nThis strategy would provide a reference for studies on defect-free\nPDMS composite membranes.