Fire-Retardant and Thermally Insulating Phenolic-Silica Aerogels
Fire-Retardant and Thermally Insulating Phenolic-Silica Aerogels
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阻燃隔热酚醛二氧化硅气凝胶
DOI：
10.1002/anie.201711717
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发表时间：
2018-04-16
影响因子：
16.6
通讯作者：
Yu, Shu-Hong
中科院分区：
文献类型：
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作者：
Yu, Zhi-Long;Yang, Ning;Yu, Shu-Hong
节能建筑需要具有低导热性和高耐火性的材料。传统的有机保温材料因其耐火性差而受到限制，而无机保温材料要么易碎，要么显示出高导热性。本文报道了一种具有机械弹性的有机/无机复合气凝胶，其热导率显著低于发泡聚苯乙烯，并且具有优异的耐火性。苯酚-甲醛-树脂（PFR）和二氧化硅的共聚和纳米级相分离产生域尺寸小于20 nm的二元网络。PFR/SiO2气凝胶可以抵抗高温火焰而不分解，并防止非暴露侧的温度升高到超过钢筋混凝土结构倒塌的临界温度。
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.