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首页> 外文期刊>Gels >From Fragile to Resilient Insulation: Synthesis and Characterization of Aramid-Honeycomb Reinforced Silica Aerogel Composite Materials
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From Fragile to Resilient Insulation: Synthesis and Characterization of Aramid-Honeycomb Reinforced Silica Aerogel Composite Materials

机译：从易碎到弹性绝热：芳纶-蜂窝增强二氧化硅气凝胶复合材料的合成与表征

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摘要

The production of a new composite material embedding aramid honeycomb materials into nano-porous silica aerogels is studied. Our aim is to improve the poor mechanical strength of silica aerogels by aramid honeycombs without losing the amazing properties of the aerogels like little density and low thermal conductivity. The composite materials were prepared using two formulations of silica aerogels in combination with aramid honeycomb materials of different cell sizes. The silica aerogels are prepared using silicon alkoxides methyltrimethoxysilane and tetraethylorthosilicate as precursors in a two-step acid–base sol–gel process. Shortly in advance of the gelation point, the aramid honeycombs were fluted by the sol, gelation occurred and, after the aging process, the gel bodies were supercritically dried. The properties of the received composite materials are satisfying. Even the thermal conductivities and the densities are a bit higher than for pure aerogels. Most importantly, the mechanical strength is improved by a factor of 2.3 compared to aramid honeycomb materials and by a factor of 10 compared to the two silica aerogels themselves. The composite materials have a good prospective to be used as an impressive insulation material.
机译：研究了将芳族聚酰胺蜂窝材料嵌入纳米多孔二氧化硅气凝胶中的新型复合材料的生产。我们的目标是通过芳族聚酰胺蜂窝改善二氧化硅气凝胶的较差的机械强度，同时又不丧失气凝胶的惊人特性，如密度小，导热系数低。复合材料是使用两种二氧化硅气凝胶配方与不同泡孔尺寸的芳纶蜂窝材料组合制备的。二氧化硅气凝胶是使用烷氧基硅甲基三甲氧基硅烷和原硅酸四乙酯作为前体，通过两步酸碱式溶胶凝胶法制备的。在凝胶化点之前不久，芳族聚酰胺蜂窝被溶胶吹出，发生凝胶化，并且在老化过程之后，将凝胶体超临界干燥。所接收的复合材料的性能令人满意。甚至热导率和密度也比纯气凝胶高一些。最重要的是，与芳族聚酰胺蜂窝材料相比，机械强度提高了2.3倍，与两种二氧化硅气凝胶本身相比提高了10倍。复合材料有望用作令人印象深刻的绝缘材料。

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