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The combination of microporous membranes with a soft functional hydrogel by a suited grafting technique endows the membrane promising functions other than filtration, such as specific adsorptions, sensing and analytics, (bio)catalysis, biomedical engineering etc.However, there remains a challenge to develop convenient and efficient grafting techniques suitable for commereial membranes.In addition, the microstructure of the grafted functional layer plays a key role on membrane performance but lacks control.We have developed controlled grafting chemistries to finely tune the microstructure of the functional layer of the composite membrane and expand the application of these membranes.A series of novel functional membranes having specific adsorption,catalytic as well as molecular sieving properties were synthesized.The effects of the microstructure of the tethered hydrogel layer, including molecular weight, composition and topology of the grafted polymer, density and distribution of the grafting polymer chains on membrane performance were investigated.