Aramid Pulp Reinforced Clay Aerogel Composites: Mechanical, Thermal and Combustion Behavior.
Aramid Pulp Reinforced Clay Aerogel Composites: Mechanical, Thermal and Combustion Behavior.
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芳纶浆粕增强粘土气凝胶复合材料：机械、热和燃烧行为
DOI：
10.3390/gels8100654
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发表时间：
2022-10-14
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本文报道了芳纶浆粕(AP)与聚乙烯醇(PVA)、蒙脱土(MMT)复合而成的粘土气凝胶复合材料，它具有机械强度高、隔热性能好、阻燃性能好等优点，在隔热领域具有广阔的应用前景。PVA-MMT-APx(x：表示AP的质量分数)气凝胶复合材料呈现各向同性的“片层-蜂窝状”多孔结构，使其具有优异的综合性能。随着AP含量的增加，气凝胶的密度保持在67~73 mg/cm~3，低导热系数保持在40.9~47.9 mW·m−·K−~1之间。力学强度显著提高，最大压缩模数从2.95提高到5.96 Mpa，比模数从44.03提高到81.64 Mpa∙·cm~3/g。基于热重分析和燃烧行为的结合，证明了PVA-MMT-APx气凝胶复合材料具有更好的热稳定性和阻燃性。本研究为利用AP增强粘土气凝胶复合材料提供了一种简便的途径，为隔热、防火、高强隔热材料的发展提供了新的思路。
In this work, we reported that aramid pulps (AP) reinforced clay aerogel composites with improved mechanical strength, good thermal insulation and fire resistance based on the combination of AP, Poly(vinyl alcohol) (PVA) and sodium montmorillonite (MMT), which present a promising prospect in the thermal insulation application. The PVA-MMT-APx (x: denotes the mass content of AP) aerogel composites present an isotropic “lamella-honeycomb” porous structure, which endows them with excellent comprehensive performance. With the AP content increasing, the extremely low density is kept, ranging between 67–73 mg/cm3, and the low thermal conductivity is maintained within 40.9–47.9 mW·m−1·K−1. The mechanical strength is significantly improved with the maximum compressive modulus increasing from 2.95 to 5.96 MPa and the specific modulus rising from 44.03 to 81.64 MPa∙cm3/g. Their detailed heat transfer process has been analyzed, which provides a deep understanding to the low thermal conductivity of the PVA-MMT-APx aerogel composites. Based on the combination of thermogravimetric analysis and combustion behavior, the PVA-MMT-APx aerogel composites are demonstrated to possess improved thermal stability and fire resistance. This study puts forward a facile approach to utilizing AP to reinforce clay aerogel composites, which provides new insight into the development of thermal-insulating, fire-safe and high-strength thermal insulation materials.
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