Polymer composite thin film, gas separation body provided with polymer composite thin film, gas separation device provided with polymer composite thin film, and manufacturing method for polymer composite thin film

A manufacturing method for a polymer composite thin film, the manufacturing method comprising:

• a first step of preparing an oxyethylene chain-containing polymer solution and preparing a polymer material-containing solution that contains polymer material which has selective permeability for a predetermined gas when formed into a thin film;
• a second step of forming a second polymer thin film by applying the oxyethylene chain-containing polymer solution onto a base material formed with a sacrificial layer such that the oxyethylene chain-containing polymer solution covers the sacrificial layer;
• a third step of cross-linking the second polymer thin film;
• a fourth step of forming a first polymer thin film by applying and curing the polymer material-containing solution so as to cover the second polymer thin film after cross-linking;
• and
• a fifth step of peeling off a polymer composite thin film composed of the first polymer thin film and the second polymer thin film from the base material by dissolving the sacrificial layer.