| abstract |
The invention provides an ultra-light polyimide aerogel and a preparation method thereof. The polyamic acid solution is prepared by using a rigid aromatic diamine monomer and a high rigid aromatic dianhydride monomer, and a low solid content polyamic acid is prepared. solution, preparation of low solid content polyimide wet gel and solvent replacement, and supercritical drying to obtain ultra-light polyimide aerogel. The invention solves the technical problem that polyimide with low solid content is difficult to form high-strength stable gel, and reduces the minimum density of polyimide aerogel from 20 mg/cm 3 to 2 mg/cm 3 , which is a worldwide method. The lightest polyimide aerogel material reported within. |