Concurrent Gelation and Phase Separation in Cross-linked-polyurea/poly(methyl methacrylate) Blend for Synthesis of Robust Nanoporous Ultrafiltration Membrane
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Recently, we reported a new synthetic strategy to obtain a nanoporous membrane by blending gel-forming networks and poly(ethylene glycol). Concurrent phase separation in the blend and gelation of network produced co-continuous nanostructure, which can be transformed into a nanoporous membrane. However, long extraction time for template removal and the remnant polymer on the pore surface have limited the scope of applications. Herein, we propose a facile synthetic methods using a chemically non-reactive linear polymer as a readily extractable porogen to obtain a polyurea membrane with tailorable pore size and surface functionalities. The pore size was controlled within meso-/macroporous regime by changing the amount of linear polymer, which also altered the filtration capability of the membrane. The meso-/macroporous membrane maintained separation performance of sub-10 nm solutes after organic solvent permeation, in addition to its long-term and moderate chemical stability.