A　novel　hydrophilic　nanocomposite　additive　(TiO2-g-PNIPAAm)　was　synthesized　by　the　surface　modification　of　titanium　dioxide　(TiO2)　with　N-isopropylacrylamide　(NIPAAm)　via　＂graft-from＂　technique.　And　the　nanocomposite　membrane　of　poly(vinylidene　fluoride)　(PVDF)/TiO　2-g-PNIPAAm　was　fabricated　by　wet　phase　inversion.　The　graft　degree　was　obtained　by　thermo-gravimetric　analysis　(TGA).　Fourier　transform　infrared　attenuated　reflection　spectroscopy　(FTIR-ATR)　and　X-ray　photoelectronic　spectroscopy　(XPS)　characterization　results　suggested　that　TiO　2-g-PNIPAAm　nanoparticles　segregated　on　membrane　surface　during　the　phase　separation　process.　Scanning　electron　microscopy　(SEM)　was　conducted　to　investigate　the　surface　and　cross-section　of　the　modified　membranes.　The　water　contact　angle　measurements　confirmed　that　TiO2-g-PNIPAAm　nanoparticles　endowed　PVDF　membranes　better　hydrophlilicity　and　thermo-responsive　properties　compared　with　those　of　the　pristine　PVDF　membrane.　The　water　contact　angle　decreased　from　92.8°　of　the　PVDF　membrane　to　61.2°　of　the　nanocompostie　membrane.　Bovine　serum　albumin　(BSA)　static　and　dynamic　adsorption　experiments　suggested　that　excellent　antifouling　properties　of　membranes　was　acquired　after　adding　TiO2-g-PNIPAAm.　The　maximum　BSA　adsorption　at　40　°C　was　about　3　times　than　that　at　23　°C.　The　permeation　experiments　indicated　the　water　flux　recover　ratio　and　BSA　rejection　ratio　were　improved　at　different　temperatures.　©　2014　Chinese　Chemical　Society,　Institute　of　Chemistry,　Chinese　Academy　of　Sciences　and　Springer-Verlag　Berlin　Heidelberg.