Compressible polybenzoxazine high-strength aerogel with a linear structure for thermal insulation

Abstract

Abstract The vulnerable structures have been the biggest barrier to the progress and use of aerogels, making it impossible to use aerogels alone in practical environments. The reversible sacrificial hydrogen bonding system in polybenzoxazine can greatly affect the strength function, providing a new approach for designing high-strength aerogels. We achieve a long-chain structured benzoxazine monomer as a precursor and a polybenzoxazine aerogel with excellent mechanical performance. The aerogel achieves a high compression strength (18.8 MPa) and a high fracture strain (78.0 %) at a 0.252 g/cm3 density. Furthermore, the aerogel also exhibits a low room temperature heat conductivity coefficient (0.03343 W/(m·K)) and hydrophobicity (water contact angle of 142.7°), demonstrating its high potential for use in the fields of construction, industry, space flight aircraft, etc.