Microporous Polymer Membranes: Molecular Stents Enhanced Solvent-Accessibility for Organic Solvent Transport.

ABSTRACT: Microporous polymer membranes with high solvent permeability are pivotal for upgrading molecular separations in organic solvents, but this remains challenging due to numerous sub-0.4 nm ultra-micropores resulting from local tight packing, which limit solvent-accessibility. Herein, a microporous polyimide with high intrinsic free volume [PI-TB-NDI, naphthalenediimide (NDI) and Tröger's base (TB)] is synthesized for organic solvent nanofiltration. The resulting polymer showed high free volume because of fused aromatic rings and a twisted structure. Aromatic rings enhanced solvent resistance due to strong molecular interaction, but increased detrimental local tight packing as well. To suppress local tight packing without compromising the molecular interactions vital for stability, an ortho-me

SUBMITTER: Guo S 

PROVIDER: S-EPMC12376686 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature