Abstract

As one of the most effective energy storage compounds, phase change materials (PCMS) play an important role in energy conservation and storage. However, the inherent poor thermal conductivity and liquid leakage of PCMS seriously limit their practical application. Polyethylene glycol·calcium chloride (PEG·CaCl₂) phase change materials filled with three-dimensional carbon fiber network were prepared by liquid phase impregnation and hot pressing molding method. The experimental results show that carbon fiber network (CF felt) and PEG·CaCl₂ complex structure increase the thermal conductivity and stability. The in-plane thermal conductivity of PEG·CaCl₂/CF composite (47.73% carbon content) is 0.97 W/mK, about 103% higher than that of PEG. PEG·CaCl₂/CF composite does not present leakage even heating at 80 °C for 45 min (35 °C higher than the melting point of pure PEG), showing low leakage ability. High thermal conductivity, low leakage and low density of this composite suggest a promising route for thermal storage applications.

摘要

作为最有效的储能化合物之一，相变材料（PCMS）在节能和存储方面发挥着重要作用。但 PCMS 固有的导热性差和漏液问题严重限制了其实际应用。采用液相浸渍和热压成型的方法制备了填充三维碳纤维网络的聚乙二醇·氯化钙（PEG·CaCl _{2 ）相变材料。}实验结果表明，碳纤维网络（CF毡）和PEG·CaCl ₂复合结构提高了导热系数和稳定性。_{PEG·CaCl 2} /CF复合材料（含碳量47.73%）的面内热导率为0.97 W/mK，比PEG高约103%。PEG·CaCl ₂/CF复合材料即使在80°C加热45分钟（比纯PEG的熔点高35°C）也不会出现泄漏，显示出低泄漏能力。这种复合材料的高导热性、低泄漏和低密度为蓄热应用提供了一条有希望的途径。