▎ 摘　　要

NOVELTY - Preparation of polyvinylamine composite functional film comprises dispersing intercalated copolymer of graphene oxide and polyvinylamine in soluble polyvinylamine aqueous solution to obtain casting solution, and coating into surface of microporous film. The intercalated copolymer has interlayer spacing of 8-24 Angstrom . USE - Method for preparation of polyvinylamine composite functional film used for selectively adsorbing and separating carbon dioxide (all claimed). ADVANTAGE - The polyvinylamine composite functional film can effectively improve selectivity of carbon dioxide/methane and carbon dioxide/nitrogen, and has higher carbon dioxide permeation rate and separation factor, and simple and easy to operate preparation method. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application of polyvinylamine composite functional film comprising fixing polyvinylamine composite functional film into membrane chamber containing carbon dioxide/nitrogen gas mixture, feeding test pressure range of 0.1-1.5 MPa, gas penetration test temperature of 25 degrees C, adjusting gas humidity through humidification tank, purging with hydrogen gas at flow rate of 20 standard cm3 and at atmospheric pressure, and detecting downstream components through gas chromatography.