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  • Title: Fire-Retardant and Thermally Insulating Phenolic-Silica Aerogels.
    Author: Yu ZL, Yang N, Apostolopoulou-Kalkavoura V, Qin B, Ma ZY, Xing WY, Qiao C, Bergström L, Antonietti M, Yu SH.
    Journal: Angew Chem Int Ed Engl; 2018 Apr 16; 57(17):4538-4542. PubMed ID: 29469238.
    Abstract:
    Energy efficient buildings require materials with a low thermal conductivity and a high fire resistance. Traditional organic insulation materials are limited by their poor fire resistance and inorganic insulation materials are either brittle or display a high thermal conductivity. Herein we report a mechanically resilient organic/inorganic composite aerogel with a thermal conductivity significantly lower than expanded polystyrene and excellent fire resistance. Co-polymerization and nanoscale phase separation of the phenol-formaldehyde-resin (PFR) and silica generate a binary network with domain sizes below 20 nm. The PFR/SiO2 aerogel can resist a high-temperature flame without disintegration and prevents the temperature on the non-exposed side from increasing above the temperature critical for the collapse of reinforced concrete structures.
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