To attain the high dispersion and strong interfacial bonding of TiO₂ in fluororubber (FKM), a novel “core–shell” structured SiO₂@TiO₂ nanofillers was designed and synthesized by in-situ polymerization and grafting modification method. For the “core–shell” structured SiO₂@TiO₂ nanospheres, the rough and irregular silica shell can improve the surface area of the SiO₂@TiO₂ filler and realize the mechanical riveting with the FKM, which shows a significant mechanical properties enhancement function. Compared with the pristine FKM, the tear strength, tensile strength, hardness, modulus at 100% strain, modulus at 300% strain, and storage modulus at −100 °C of FKM/SiO₂@TiO₂ enhanced by 42.4%, 196.9%, 10%, 24.4%, 66.7%, and 15.5%, respectively. The sample’s electrical, thermal, and color properties were also improved and showed the highest haze and lowest light transmissions. Such a simple and effective method of preparing “core–shell” structured SiO₂@TiO₂ nanofillers provides great potential in industrial applications.

_{为了实现TiO 2}在氟橡胶（FKM）中的高分散性和强界面结合，通过原位聚合和接枝改性方法设计并合成了一种新型“核壳”结构的SiO ₂ @TiO _{2纳米填料。}对于“核壳”结构的SiO ₂ @TiO _{2纳米球，粗糙且不规则的二氧化硅壳可以提高SiO 2} @TiO ₂填料的表面积并实现与FKM的机械铆接，机械性能显着增强功能。与原始FKM相比，FKM/SiO ₂ @TiO ₂的撕裂强度、拉伸强度、硬度、100%应变模量、300%应变模量和-100℃储能模量分别提高了42.4%、196.9%分别为 10%、24.4%、66.7% 和 15.5%。样品的电学、热学和颜色特性也得到改善，并表现出最高的雾度和最低的透光率。这种简单有效的制备“核-壳”结构SiO ₂ @TiO ₂纳米填料的方法在工业应用中具有巨大的潜力。