Abstract Phase change material (PCM) is a new kind of material for energy storage; its thermal properties are key factors in determining the application areas and the actual effect. The polyethylene glycol (PEG)/expanded graphite (EG) composite was prepared as a novel form-stable PCM by vacuum impregnation in this study. Nitrogen adsorption test indicated that EG belonged to materials in mesoporous scale with developed porous structure and prodigious adsorbility. The PEG/EG PCM owned excellent sealing performance and remarkable thermal storage capacity. The phase change temperatures and latent heats of the PEG/EG PCM were in range of 18.89–25.93 °C and 97.56–98.59 J·g−1 respectively. TGA and thermal performance manifested that the PEG/EG PCM presented good thermal stability and EG performed favorable conductivity and improved the thermal storage efficiency. The obtained PCMs were suitable for indoor energy saving and thermal comfort improvement.

中文翻译：

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聚乙二醇/膨胀石墨作为室内节能新型形稳相变材料的制备及热性能

摘要 相变材料（PCM）是一种新型的储能材料；其热性能是决定应用领域和实际效果的关键因素。在本研究中，通过真空浸渍将聚乙二醇 (PEG)/膨胀石墨 (EG) 复合材料制备为一种新型形状稳定的 PCM。氮吸附试验表明EG属于介孔尺度材料，具有发达的多孔结构和惊人的吸附能力。PEG/EG PCM 具有优良的密封性能和显着的蓄热能力。PEG/EG PCM 的相变温度和潜热分别在 18.89-25.93 °C 和 97.56-98.59 J·g-1 的范围内。TGA和热性能表明PEG/EG PCM表现出良好的热稳定性，EG表现出良好的导电性并提高了蓄热效率。获得的PCMs适用于室内节能和热舒适性改善。