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Facile preparation of a phenolic aerogel with excellent flexibility for thermal insulation

An ambient pressure drying, cost-effective and environment-friendly synthesis method for aerogels has been continuously pursued by scholars.?However, phenolic aerogels are usually rigid and prepared from phenol and aldehyde monomers through complicated and long-time supercritical drying processes, which limit their production efficiency. This paper introduces an ambient pressure drying method for preparing lightweight and low-thermal-conductivity phenolic aerogels with excellent flexibility. The prepared flexible phenolic aerogels (FPAs) have a complete 3D network structure, low thermal conductivity (approximately 0.03?W/(m?K)) and excellent compressibility and recovery performance (compression strain can reach 50%, and rebound rate can reach 80%). Given their simple synthesis, simple scaling up and excellent mechanical properties, such flexible phenolic aerogels may have great potential to serve as thermal insulating materials.

» Author: Han He, Liyan Geng, Feng Liu, Bin Ma, Wenxuan Huang, Lijie Qu, Baosheng Xu

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