Preparation and Properties of Organosilicon Modified Phenolic Resin Aerogels and Their Composites
Fiber-reinforced phenolic resin aerogel composites have attracted much attention in the field of high-temperature thermal protection due to their low density,low thermal conductivity,and excellent thermal stability.In order to meet the increasingly demanding thermal protection service environment,a silane chain segment was introduced into phenolic resin through in situ copolymerization by hydrolysis,a silane-modified phenolic aerogel with excellent oxidation and ablation resistance was prepared,and it was composited with quartz fibers to obtain fiber-reinforced hybrid phenolic aerogel composites.The performance test showed that after 15 s of treatment under 1 300 ℃ butane flame,the mass ablation rate of fiber-reinforced hybridized phenolic aerogel composites was 0.087 9 g/s,and the linear ablation rate was 0.034 7 mm/s,which were 52.0％and 15.6％lower than that of the pure phenolic aerogel composites,respectively;After heating under a 40 kW quartz lamp for 20 min,the mass ablation rate was 0.230 g/min and the linear ablation rate was 0.051 mm/min,which decreased by 57.9％and 67.3％,respectively,compared with the pure phenolic aerogel composites.The results show that the introduction of silane chain segments greatly improves the oxidation and ablation resistance performance of the material,and this fiber-reinforced hybrid phenolic aerogel composite has a broad application prospect in the field of aerospace thermal protection.
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