Porous polymer networks incorporated PTMSP membrane with enhanced organic solvent nanofiltration performance

Exploring organic solvent nanofiltration (OSN) membranes with improved permeability and selectivity is imperative to realize energy efficient separation in industry practice. Herein, we fabricated mixed matrix membranes (MMMs) based on Poly(1-trimethylsilyl-1-propyne) (PTMSP) and a variety of porous polymer networks, including p-DCX, p-DCX-NH2, PAF-1 and PAF-1-NH2, via a simple drop-casting method. These hypercrosslinked additives, which are compatible with the polymer matrix, were employed to create additional pathways for solvent transport, reduce defect cavities to enhance solute rejection, and inhibit the migration of polymer chains. The methanol permeance of MMMs increased by as much as 74 % and the retention of Rose Bengal (MW:1017 g center dot mol-1) was improved from 95.2 % to 99.2 %. In contrast to the pure PTMSP membrane, the MMMs displayed superior performance and OSN stability during 100 h of continuous operation (methanol permeation loss rate decreased from 35.6 % to 11.3 %). This study provides insight for the benefits of additives with porous polymer networks for OSN membranes, and is favor for the wide application of these exciting membrane materials.