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Influence of Structure-Directing Additives on the Properties of Poly(methylsilsesquioxane) Aerogel-Like Materials

机译:结构指针添加剂对聚(甲基硅烷硅氧烷)气凝胶状材料性能的影响

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摘要

The effect of glycerol (GLY) and poly(ethylene glycol) (PEG) additives on the properties of silica aerogel-like monoliths obtained from methyltrimethoxysilane (MTMS) precursor was assessed. The tested molar ratios of additive/precursor were from 0 to 0.1 and the lowest bulk densities were obtained with a ratio of 0.025. When a washing step was performed in the sample containing the optimum PEG ratio, the bulk density could be reduced even further. The analysis of the material’s microstructure allowed us to conclude that GLY, if added in an optimum amount, originates a narrower pore size distribution with a higher volume of mesopores and specific surface area. The PEG additive played a binder effect, leading to the filling of micropores and the appearance of large pores (macropores), which caused a reduction in the specific surface area. The reduction of the bulk density and the microstructural changes in the aerogels induced by adding a small amount of these additives confirm the possibility of fine control of properties of these lightweight materials. The achieved high porosity (97%) and low thermal conductivity (~35 mW·m−1·K−1) makes them suitable to be used as thermal insulators.
机译:评估甘油(Gly)和聚(乙二醇)和聚(乙二醇)(PEG)添加剂对从甲基三甲氧基硅烷(MTMS)前体中获得的二氧化硅气凝胶状石英的性质的影响。添加剂/前体的测试摩尔比为0至0.1,并且使用比例为0.025的最低堆积密度。当在含有最佳PEG比的样品中进行洗涤步骤时,可以进一步降低堆积密度。对材料的微观结构的分析使我们允许我们得出含量,如果以最佳量添加,则来自较高体积的中孔和比表面积的较窄的孔径分布。 PEG添加剂发挥了粘合剂效果,导致微孔的填充和大孔(大孔)的外观,这导致了比表面积的减小。通过加入少量这些添加剂诱导的气凝胶中的堆积密度和微观结构变化的减少证实了这些轻质材料的性能的精细控制的可能性。实现的高孔隙率(97%)和低导热率(〜35mW·M-1·K-1)使其适合用作热绝缘体。

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