Fabrication of Microporous Polymeric Film via Colloid‐Based Layer‐By‐layer Technology for CO2 Capturing

Large‐scale and simple strategies to flexibly preparing materials with industrial application potential attract people's attention. Layer‐by‐layer (LBL) self‐assembly technology is a typical preparation method for current nanomaterials to address the large‐scale concern and achieve the possibility of a simple, streamlined and controllable process. Here, a novel and simple strategy is developed to fabricate microporous polymeric film (MPF) based on poly(styrene‐hydroxyethyl methylacrylate) (P(St‐HEMA)) microspheres, in combination with LBL self‐assembly technology and hypercrosslinked microporous post‐treatment. To improve the mechanical properties of the film, the buffer layer of polyethyleneimine (PEI) and poly(sodium‐p‐styrenesulfonate) (PSS) are used to avoid swelling of nanoparticles and the methacryloxyethyltrimethyl ammonium chloride (DMC) is chosen to increase the force between the nanoparticles via UV‐crosslinking. The MPF has well CO2 capture capabilities up to 46.21 wt% (10.52 mmol g−1), large‐scale feature and certain improved mechanical properties. It is hoped that the research could display a successful strategy to prepare the large‐scale film for the application of industrialization. Porous organic polymers or hypercrosslinked polymers are urgently required to achieve simple, controllable, and streamlined preparation for application of industrialization. The microporous polymeric film synthesized via layer‐by‐layer technology features large‐scale and could be programmed manufactured. The materials have high specific surface area (338.33 m2 g−1) and well CO2 capacity of 41.24 wt% (10.52 mmol g−1). Through adding buffer layers and UV‐crosslinking by methacryloxyethyltrimethyl ammonium chloride, the mechanical properties of films have a certain improvement.