Silica (SiO2) aerogel is a kind of nanoporous solid material with high specific surface area,high porosity,low thermal conductivity and other characteristics,but at the same time its mechanical properties are poor.By introducing polyimide (PI) with good mechanical properties,high and low temperature resistance and good thermal stability to compound silica aerogel,a composite material combining the advantages of both can be prepared.The latest research progress of polyimide/silica aerogel composites was reviewed,the types and properties of the composites were introduced,their applications in thermal insulation,flame retardant and waterproof were summarized,and their development prospects were discussed.
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