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首页> 外文期刊>Journal of Sol-Gel Science and Technology >Study of the suitability of silica based xerogels synthesized using ethyltrimethoxysilane and/or methyltrimethoxysilane precursors for aerospace applications
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Study of the suitability of silica based xerogels synthesized using ethyltrimethoxysilane and/or methyltrimethoxysilane precursors for aerospace applications

机译：使用乙基三甲氧基硅烷和/或甲基三甲氧基硅烷前体合成的二氧化硅基干凝胶在航空航天应用中的适用性研究

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摘要

Silica based materials were synthesized using ethyltrimethoxysilane (ETMS) and/or methyltrimethoxysilane (MTMS) precursors by sol-gel technology, in order to ascertain if their properties are suitable for aerospace applications. When ETMS was used alone and in equi-molar ETMS/MTMS mixtures, no gel formation took place and a resin-like precipitate was observed. After drying, a compact tablet was formed. When mixtures of 25% ETMS/ 75% MTMS and MTMS alone were used, gel formation occurred and xerogels were produced upon drying. Chemical and structural characterization of the obtained materials was performed using Elemental Analysis, FTIR, XRD and SEM. Bulk density, specific surface area, contact angle and the thermal behavior were also evaluated. For materials from ETMS, the chemical structure grows preferentially in one direction and, in the case of MTMS the growth follows a 3D pattern. The use of ETMS precursor leads to a significant increase in the product density, accompanied by a decrease in the specific surface area. It also leads to a decrease in the thermal stability limit of the synthesized materials. Then, ETMS precursor is less appropriate than MTMS precursor for space applications. However, ETMS co-precursor in mixtures with MTMS contributes to the increase in the hydrophobic character of the synthesized materials.
机译：为了确定它们的性能是否适合航空航天应用，使用乙基三甲氧基硅烷（ETMS）和/或甲基三甲氧基硅烷（MTMS）前驱体合成了二氧化硅基材料。当单独使用ETMS并在等摩尔ETMS / MTMS混合物中使用时，没有形成凝胶，并且观察到树脂状沉淀。干燥后，形成片剂。当单独使用25％ETMS / 75％MTMS和MTMS的混合物时，会形成凝胶，干燥后会产生干凝胶。使用元素分析，FTIR，XRD和SEM对获得的材料进行化学和结构表征。堆积密度，比表面积，接触角和热行为也被评估。对于ETMS的材料，化学结构优先沿一个方向生长，对于MTMS，其生长遵循3D模式。 ETMS前体的使用导致产物密度显着增加，同时比表面积减小。这也导致合成材料的热稳定性极限降低。然后，对于空间应用而言，ETMS前体不如MTMS前体合适。但是，与MTMS混合使用的ETMS共前体有助于合成材料疏水性的提高。

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