2,2′‐Biphenol‐based Ultrathin Microporous Nanofilms for Highly Efficient Molecular Sieving Separation

Organic solvent nanofiltration (OSN) is an emerging membrane separation technology, which urgently requires robust, easily processed, OSN membranes possessing high permeance and small solutes-selectivity to facilitate enhanced industrial uptake. Herein, we describe the use of two 2,2′-biphenol (BIPOL) derivatives fabricate hyper-crosslinked, microporous polymer nanofilms through IP. Ultra-thin, defect-free polyesteramide/polyester (≈5 nm) could be obtained readily due relatively large molecular size ionized nature BIPOL monomers retarding rate The microporosity arises from hyper-crosslinked network structure monomer rigidity. Specifically, amino-BIPOL/PAN exhibits extraordinary permselectivity performances with weight cut-off as low 233 Da MeOH ≈13 LMH/bar. Precise dye mixtures similar M.W. based on both their charge are achieved.