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Ultralight and Flexible Monolithic Polymer Aerogel with Extraordinary Thermal Insulation by A Facile Ambient Process
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-05-27 , DOI: 10.1002/admi.201900314 Man Li 1 , Zihao Qin 1 , Ying Cui 1 , Chiyu Yang 1 , Changyu Deng 1 , Yunbo Wang 1 , Joon Sang Kang 1 , Hongyan Xia 1 , Yongjie Hu 1
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-05-27 , DOI: 10.1002/admi.201900314 Man Li 1 , Zihao Qin 1 , Ying Cui 1 , Chiyu Yang 1 , Changyu Deng 1 , Yunbo Wang 1 , Joon Sang Kang 1 , Hongyan Xia 1 , Yongjie Hu 1
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High performance thermal insulation materials are desired for a wide range of applications in space, buildings, energy, and environments. Here, a facile ambient processing approach is reported to synthesize a highly insulating and flexible monolithic poly(vinyl chloride) aerogel. The thermal conductivity is measured respectively as 28 mW (m K)−1 at atmosphere approaching the air conductivity and 7.7 mW (m K)−1 under mild evacuation condition. Thermal modeling is performed to understand the thermal conductivity contributions from different heat transport pathways in air and solid. The analysis based on the Knudsen effect and scattering mean free paths shows that the thermal insulation performance can be further improved through the optimization of porous structures to confine the movement of air molecules. Additionally, the prepared aerogels show superhydrophobicity due to the highly porous structures, which enables new opportunities for surface engineering. Together, the study demonstrates an energy‐saving and scalable ambient‐processing pathway to achieve ultralight, flexible, and superhydrophobic poly(vinyl chloride) aerogel for thermal insulation applications.
中文翻译：
超轻且柔性的整体式聚合物气凝胶，通过便捷的环境工艺实现绝热
高性能绝热材料是空间，建筑物，能源和环境中广泛应用所需要的。在此，据报道，一种简便的环境处理方法可以合成高度绝缘且具有柔性的整体式聚氯乙烯气凝胶。在接近空气传导率的气氛下测得的热导率分别为28 mW（m K）-1和7.7 mW（m K）-1在轻度疏散条件下。进行热建模是为了了解来自空气和固体中不同热传递路径的热导率贡献。基于克努森效应和散射平均自由程的分析表明，通过优化多孔结构以限制空气分子的运动，可以进一步提高隔热性能。另外，由于高度多孔的结构，制备的气凝胶显示出超疏水性，这为表面工程提供了新的机会。这项研究共同证明了一种节能且可扩展的环境处理途径，可实现用于隔热应用的超轻，灵活和超疏水的聚氯乙烯气凝胶。
更新日期：2019-05-27
中文翻译：
超轻且柔性的整体式聚合物气凝胶，通过便捷的环境工艺实现绝热
高性能绝热材料是空间，建筑物，能源和环境中广泛应用所需要的。在此，据报道，一种简便的环境处理方法可以合成高度绝缘且具有柔性的整体式聚氯乙烯气凝胶。在接近空气传导率的气氛下测得的热导率分别为28 mW（m K）-1和7.7 mW（m K）-1在轻度疏散条件下。进行热建模是为了了解来自空气和固体中不同热传递路径的热导率贡献。基于克努森效应和散射平均自由程的分析表明，通过优化多孔结构以限制空气分子的运动，可以进一步提高隔热性能。另外，由于高度多孔的结构，制备的气凝胶显示出超疏水性，这为表面工程提供了新的机会。这项研究共同证明了一种节能且可扩展的环境处理途径，可实现用于隔热应用的超轻，灵活和超疏水的聚氯乙烯气凝胶。
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