Morphology controlled carbon aerogel with enhanced thermal insulation and mechanical properties: a simple route for the regulated synthesis
Morphology controlled carbon aerogel with enhanced thermal insulation and mechanical properties: a simple route for the regulated synthesis
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具有增强隔热性和机械性能的形态控制碳气凝胶：调控合成的简单途径
DOI：
10.1016/j.jnoncrysol.2021.120828
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发表时间：
2021-07
影响因子：
3.5
通讯作者：
陈忠
中科院分区：
文献类型：
--
作者：
刘洪丽;王鹏;张博;李洪彦;李婧;李亚静;陈忠
提出了一种简单的路线来制备具有优异隔热性和机械性能的尺寸控制碳气凝胶。硼改性酚醛树脂（BPR）和六亚甲基四胺（HMTA）首先交联形成三维网络结构，然后进行CO2超临界干燥和碳化。为了调节BPR气凝胶的微观结构，根据SEM的微观形貌表现，确定了HMTA与BPR的最佳比例为H/P=1/5。还通过 FTIR 光谱研究了 HMTA 和 BPR 之间的相互作用，并通过 SEM 技术说明了目标产物碳气凝胶的微观结构演变。 SEM图表明，基于N2吸附-解吸法，碳气凝胶在1000℃（碳化温度）下保持稳定的多孔结构，孔径分布在321∼612nm之间。该合成方法方便灵活，可以通过调节碳化温度和时间来定制多孔结构、机械强度、密度和导热系数。因此，所获得的碳气凝胶具有高压缩强度（1.0∼2.3 MPa）、低密度（0.16∼0.26 g·cm−3）和低导热系数（0.023∼0.036 W m−lK−1），值得成为高温隔热材料的有力候选者。
A simple route was proposed to prepare size-controlled carbon aerogel with superior thermal insulation and mechanical properties. Boron-modified phenolic resin (BPR) and hexamethylene-tetramine (HMTA) were crosslinked to build three-dimensional network structure initially followed by CO2supercritical drying and carbonization. In order to regulate the microstructure of BPR aerogels, the best proportion of HMTA to BPR was confirmed as H/P = 1/5 based on the micromorphology performance in SEM. The interaction between HMTA and BPR was also studied by FTIR spectra, and microstructure evolution of the target product- carbon aerogels were illustrated by SEM technique. SEM patterns indicated that the carbon aerogels maintain a stable porous structure at 1000 °C (carbonization temperature), and pore size distribution were between 321∼612nm based on N2adsorption-desorption method. The synthesis method is convenient and flexible, permitting a tailor of porous structure, mechanical strength, density and thermal conductivity by adjusting carbonization temperature and time. Consequently, the obtained carbon aerogel with high compressive strength (1.0∼2.3 MPa), low density (0.16∼0.26 g‧cm−3) and low thermal conductivity (0.023∼0.036 W m−lK−1) deserve to be a competitive candidate for high-temperature heat insulation material.
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