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The water and salt transport properties of polymer films play a key role in reverse osmosis (RO), forward osmosis (FO), pervaporation, ion exchange, and other fields of application.In this paper, two series of zwitterionic and one series of uncharged copolymer hydrogel networks were synthesized using poly(ethylene glycol) diacrylate (PEGDA) as the crosslinker, sulfobetaine methacrylate(SBMA), carboxybetaine methacrylate (CBMA) and poly(ethylene glycol) acrylate (PEGA) as comonomer by UV-induced free radical crosslinking copolymerization.Water and salt transport properties in those polymers films were investigated.The study found that crosslink density strongly influenced water uptake and water permeability for materials of constant chemical composition.The PSBMA polymer films have the biggest water uptake, water permeability and the salt permeability, and the salt permeability is similar to cation exchange films with the changes in salt concentration.Water uptake of PCBMA polymer films was a little higher than uncharged polymer films, but salt permeability is similar to uncharged polymer films along with the change of salt concentration.The above three series of hydrogel films have a high water permeability and a low water/salt selectivity.There appear to be a tradeoff between water permeability and water/salt selectivity.