Abstract

This paper showed two bio-based shape-stable composite phase change materials (PCMs) which were prepared through a convenient vacuum impregnation method. Lignin-based ordered porous carbon (LOC) was the porous supporting material, polyethylene glycol (PEG) and paraffin (PA) was the phase change substance in this work. The maximum loading of PCMs in the obtained LOC/PEG and LOC/PA are 70% and 75%, respectively, and their phase transition enthalpy (ΔH_m) are also as high as 81.5 J·g⁻¹ and 88.5 J·g⁻¹, respectively. When the loading amount is the same as 60%, the thermal conductivity of LOC/PEG is 0.5029 W/mK, which is a 50.3% improvement over PEG. The thermal conductivity of pure PA is 0.3430 W/mK, and the thermal conductivity of LOC/PA is 0.5847 W/mK, an increase of 70.5% compared to paraffin. In addition, the obtained LOC/PA showed better thermal management capabilities and better thermal stability after infrared thermography tests compared to LOC/PEG. Considering the low cost and excellent properties, the obtained lignin-based ordered porous carbon composite phase change material has a promising future for practical applications in thermal energy storage.

摘要

本文展示了两种通过便捷的真空浸渍法制备的生物基形状稳定复合相变材料 (PCM)。基于木质素的有序多孔碳（LOC）是多孔支撑材料，聚乙二醇（PEG）和石蜡（PA）是这项工作中的相变物质。所得LOC/PEG和LOC/PA中PCMs的最大负载量分别为70%和75%，相变热函(ΔH _m )也高达81.5 J·g ^-1和88.5 J·g ^{- 1个}， 分别。当负载量为60%时，LOC/PEG的热导率为0.5029 W/mK，比PEG提高了50.3%。纯PA的导热系数为0.3430 W/mK，LOC/PA的导热系数为0.5847 W/mK，相比石蜡提高了70.5%。此外，与 LOC/PEG 相比，获得的 LOC/PA 在红外热成像测试后显示出更好的热管理能力和更好的热稳定性。考虑到低成本和优异的性能，所获得的木质素基有序多孔碳复合相变材料在热能存储方面具有广阔的实际应用前景。