Thermally Insulating SiO2/PSA Composite Aerogels with Heat Resistance and Mechanical Properties via the Thiol-Yne Click Reaction

Polymer-reinforced silica aerogelsare thermally insulating materialsemployed to enhance mechanical properties; however, they exhibit lowheat stability and require a complex production process. The mainbody of this work concerns the synthesis of silicon-containing polyarylacetylene(PSA) resin, which has exceptional thermal properties and is usedto strengthen the gel skeleton and significantly improve the heatresistance of the polymer reinforcement phase. The honeycomb-likeporous SiO2/PSA aerogels derived from directional freezingwere obtained via click reaction, gel aging, freeze-drying, and curingwithout the requirement for time-consuming solvent replacement. Theprepared SiO2/PSA aerogel is low density (& SIM;0.3 g/cm(3)) and high porosity (& SIM;80%), which provides the materialwith low levels of thermal conductivity (& SIM;0.06 W/m & BULL;K)and excellent thermal insulation performance. When compared to themajority of polymer aerogels and aerogel-like materials, the preparedSiO(2)/PSA aerogels have high T (d5) (& SIM;460 & DEG;C) and Y (r800) (& SIM;80%)and compressive strength (compression strength > 1.5 MPa). SiO2/PSA composite aerogel has numerous functions in areas wherematerials must withstand extremely elevated temperatures, such asthe aerospace industry.

Automated summary

This study focuses on the synthesis of silicon-containing polyarylacetylene (PSA) resin, which enhances the heat resistance and mechanical properties of polymer reinforcement phase. The honeycomb-like porous SiO2/PSA aerogels, prepared through click reaction, gel aging, freeze-drying, and curing, possess low density, high porosity, low thermal conductivity, and excellent thermal insulation performance. Compared to other polymer aerogels and materials, SiO2/PSA composite aerogel exhibits high temperature resistance, compressive strength, and has potential applications in the aerospace industry.