Gnani Peer Mohamed, S.I.Isloor, A.M.Farnood, R.2026-02-042022ACS Applied Materials and Interfaces, 2022, 14, 40, pp. 45800-4580919448244https://doi.org/10.1021/acsami.2c11814https://idr.nitk.ac.in/handle/123456789/22363Ionic polymer nanoparticles (IPNs) were synthesized in one pot by quaternization precipitation polymerization (QPP) as a novel polymerization technique. QPP eliminated the usage of high-cost ionic monomers and reduced the number of steps for the preparation of IPN. The monomers 2-(dimethylamino)ethyl methacrylate (DMAEMA) and 4-vinylbenzyl chloride (VBC) polymerized in the presence of azobisisobutyronitrile (AIBN) and underwent quaternization simultaneously, which yielded ionic poly(DMAEMA-co-VBC) nanoparticles in one step with the size of 50-80 nm without any stabilizer and catalyst. Similarly, 4-vinylpyridine (VP) and VBC polymerized in the presence of AIBN and underwent quaternization simultaneously, which yielded ionic poly(VP-co-VBC) nanoparticles in one step with the size of 70-90 nm without any stabilizer and catalyst. The as-synthesized IPN was further utilized for the fabrication of hydrophilic nanocomposite ultrafiltration membranes for oil/water separation. Fabricated hybrid membranes were characterized and studied for oil rejection properties. It exhibited an oil rejection of >96% with a pure water permeability of 219 L/m2 h bar. © 2022 American Chemical Society.Chlorine compoundsMonomersNanoparticlesPolymerizationPrecipitation (chemical)Synthesis (chemical)4-vinylbenzyl chloridesAzobisisobutyronitrileIonic polymerOil/water separationPolymer nanoparticlesPolysulphonePrecipitation polymerizationsQuaternizationQuaternization precipitation polymerizationSynthesisedUltrafiltration