The effects of self-made nano particles titanium dioxide(TiO2)and iron-doped titanium dioxide(TiO2/Fe2O3)as heat-resistant additives on thermal stability and tensile properties of fluorosili-con rubber after hot air aging were studied.The de-composition products of fluorosilicon rubber at 5％weight loss in air and the content of characteristic groups of fluorosilicon rubber before and after ther-mal aging were analyzed.The effects of commercial heat-resistant additives,such as nano ceria(CeO2),ferric oxide(Fe2O3)and aluminum trioxide(Al2O3)on fluorosilicone rubber were compared.The results showed that when the mass fraction of nano heat-resistant additive was 2％,the 5％weight loss tem-perature of fluorosilicone rubber in air from high to low was TiO2/Fe2O3,TiO2,Fe2O3,CeO2,Al2O3 samples and blank sample.The 5％weight loss temperature of fluorosilicone rubber with nano-TiO2/Fe2O3 heat-resistant additive reached 453 ℃,which was 47 ℃ higher than that of blank sample.Nano-TiO2/Fe2O3 heat-resistant additive could significantly inhibit oxidation of fluorine-containing side groups of fluo-rosilicone rubber,which was the main reason for im-provement of the heat resistance of fluorosilicone rubber.
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