Electrospun, non-woven fiber membranes of porous polyimides with high carbon dioxide uptakes and selectivities

Abstract

Microporous organic polyimides are well suited for carbon dioxide separation from gas mixtures based on their polar surface and their tendency towards ultramicroporosity. Nevertheless, their application potential is limited due to an inherent insolubility and infusibility, preventing an easy processing into functional objects like membranes. By establishing a three-step synthesis procedure for the literature known network NPI-I, here, a solution to this challenge is demonstrated. The central step is electrospinning of a solution of the linkers tetrakis(4-aminophenyl)methane and naphthalene 1,4,5,8-tetracarboxylic dianhydride and the auxiliary polymer polyvinylpyrrolidone into a precursor fiber mat. The mat was then heated to polymerize the linkers into the polyimide. Subsequently, PVP was removed by pyrolysis obtaining a robust, flexible and self-standing membrane. The NPI-I fiber mat exhibits a remarkable microporosity with a BET surface area of 222 m 2 /g, a total pore volume of 0.121 cm 3 /g and a high amount of ultramicropores. Its CO 2 uptake of 3.0 mmol/g (0 °C, 1 bar) and its CO 2 /CH 4 selectivity of about 20 (0 °C, 1 bar) even exceed the literature values for bulk NPI-I. This study reveals that PVP acts as a template on molecular level influencing, primarily the micropore formation, reducing the BET surface area by roughly a factor of three compared to the bulk material. In contrast, the ultramicroporosity of the porous polyimides remains mainly unaffected. We envision that this three-step synthesis can be transferred to a broad variety of porous polymers. With electrospinning the large-scale production of self-standing membranes becomes realistic rendering the application of porous polymers for gas separation more likely. • Shaping of ultramicroporous polyimides into non-woven, robust and flexible fiber membranes with a hierarchical porosity • Development of a three-step synthesis procedure based on electrospinning with thermally labile auxiliary polymer • Auxiliary polymer acts as template which influences the micro- and mesoporosity of the fibrous membranes • Synthesis procedure retains the ultramicroporous character of the polyimides