Polydimethylsiloxane/polysulfone ultrathin composite membrane as well as preparation method and application thereof

The invention belongs to the technical field of gas-liquid two-phase gas separation membranes, and relates to a polydimethylsiloxane/polysulfone ultrathin composite membrane, and a preparation method and application thereof. The preparation method comprises the following steps: preparing a polysulfone-based membrane by using a phase inversion method: dissolving polysulfone in N, N-dimethylacetamide with the mass fraction of about 14-15%, and soaking the membrane in a deionized water phase for at least 24 hours after scraping the membrane; pDMS is dissolved in isooctane, and the composite membrane is prepared by adopting a wet membrane dip-coating method. And placing the coated membrane in a drying oven at 85 DEG C for 2 hours to complete crosslinking, thereby obtaining the composite membrane. The method is used for preparing the composite membrane material with high CO2/O2 selectivity, high gas permeability and good pollution resistance. The whole membrane preparation process is simple, the raw materials are