Organic/inorganic composite aerogel with flame-retardant and heat-insulating properties and preparation method of organic/inorganic composite aerogel

The invention provides organic/inorganic composite aerogel with flame-retardant and heat-insulating properties and a preparation method of the organic/inorganic composite aerogel. The aerogel adopts polyimide (PI) nanofibers as a framework material of the aerogel, and silicon dioxide particles are uniformly dispersed in pores of the PI nanofibers. The preparation method comprises the following steps: synthesizing a polyamic acid solution through polycondensation reaction of dianhydride and diamine, preparing polyamic acid nanofibers by adopting an electrostatic spinning, air-blowing spinning or air-blowing assisted electrostatic spinning method, then dispersing the polyamic acid nanofibers and fumed silica particles in a solvent together, carrying out vacuum freeze drying on the obtained dispersion liquid, and finally carrying out thermal imidization treatment to obtain the high-temperature-resistant polyimide composite material. The PI nanofiber/silicon dioxide composite aerogel is obtained. The aerogel prep