In　recent　years,　loading　antioxidants　onto　inorganic　nanoparticles　has　attracted　increasing　interest.　However,　the　existing　studies　not　only　have　low　antioxidant　loading　efficiency,　but　also　ignore　the　relationship　between　structural　changes　and　antioxidant　properties　before　and　after　antioxidant　modification,　greatly　limiting　the　improvement　of　the　antioxidant　properties　of　composites　and　their　application　scope.　In　this　work,　we　successfully　prepared　bis-hindered　phenolic　antioxidants　containing　silica　hydroxyl　groups　(Bis-mAO)　and　loaded　them　onto　silicon　dioxide　(SiO2)　to　get　the　nanocomposites　(Bis-mAO-SiO2).　The　melt　blending　method　further　prepared　the　corresponding　polyphenylene　sulfide　(PPS)/Bis-mAO-SiO2　composites.　The　results　showed　that　the　higher　antioxidant　loading　and　more　suitable　antioxidant　structure　made　Bis-mAO-SiO2　possess　excellent　antioxidant　properties.　The　prepared　PPS/Bis-mAO-SiO2　composites　remained　stable　under　high　temperatures　and　oxygen　environments.　Impressively,　the　maximum　weight　loss　rate　temperature　of　PPS/Bis-mAO-SiO2　was　increased　by　11.60　°C　compared　to　that　of　PPS,　and　after　accelerated　thermal　oxidation　at　220　°C　for　24　h,　the　relative　intensity　ratio　between　O　and　C　of　PPS/Bis-mAO-SiO2　only　increased　to　0.086,　much　lower　than　0.132　for　PPS.　Moreover,　the　viscosity　of　PPS/Bis-mAO-SiO2　only　increased　by　29.05　%　and　88.75　%　after　accelerated　thermal　oxidation　at　220　°C　for　12,　24　h.　Compared,　PPS＇s　viscosity　increased　substantially　by　79.22　%　and　250.3　%,　respectively.　This　meant　that　the　Bis-mAO-SiO2　successfully　achieved　a　synergistic　integration　of　high　antioxidant　properties　and　thermal　stability,　implying　that　the　work　offered　a　strategy　for　fabricating　high-temperature　resistant　antioxidant　composites.　©　2024　Elsevier　B.V.