Rubber　nanocomposites　with　high　gas　barrier　property　have　extensive　application　prospects　in　sealing　and　packing　industry,　while　developing　a　novel　and　cost-effective　rubber　-based　material　with　low　gas　permeability　and　good　mechanical　property　still　remains　a　challenge.　Herein,　we　designed　and　fabricated　an　excellent　gas　barrier　film　by　using　polyvinyl　pyrrolidone　modified　ultrathin　layered　double　hydroxide　nanoplatelets　(U-mLDH)　and　nitrile　butadiene　rubber　(NBR)　as　building　blocks.　The　resultant　(U-mLDH/NBR)(30)　film　displays　significantly　decreased　(reduced　by　92.2%　compared　with　NBR　film)　oxygen　transmission　rate　with　0.626　cm(3)　m(-2)　day(-1)　atm(-1),　and　much　lower　relative　permeability　in　comparison　with　reported　rubber　composites.　The　improved　gas　barrier　performance　is　ascribed　to　the　prolonged　passage　of　oxygen　molecules　and　the　decreased　free　space　arising　from　large　aspect　ratio　of　U-mLDH　and　good　interfacial　compatibility.　In　addition,　the　(U-mLDH/NBR)so　film　also　possesses　high　thermal　stability　and　satisfactory　mechanical　property,　which　would　guarantee　its　practical　applications.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.