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Dongyao Zhang, Chuanchang Li, Niangzhi Lin, Baoshan Xie, and Jian Chen, Mica-stabilized polyethylene glycol composite phase change materials for thermal energy storage, Int. J. Miner. Metall. Mater., 29(2022), No. 1, pp. 168-176. https://doi.org/10.1007/s12613-021-2357-4
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李传常 E-mail: chuanchangli@126.com
储热技术的发展能够有效解决能源供需不匹配的矛盾，储能技术的实施离不开储热材料。相变材料作为储热材料的核心，在太阳能热利用、建筑节能、电池热管理等诸多领域展开了研究应用。但是相变材料存在固-液相变过程泄漏、导热系数偏低等缺陷，阻碍了其实际应用。云母矿物具有独特形貌结构、良好的热稳定性等原料优势，同时具备简单易得、价格低廉的成本优势。本文旨在开发一种高性能、低成本的复合相变储热材料，采用真空浸渍法制备了云母/聚乙二醇复合相变储热材料，借助X射线衍射仪、傅里叶红外光谱仪表征复合相变材料的晶体和化学结构；热重分析仪表征复合相变材料的热稳定性能；差示扫描量热仪获取复合相变材料的相变温度、相变潜热和循环稳定性能；储放热性能测试和瞬态温度响应实验获取了复合相变材料储存/释放热能的速率以及对温度变化的响应快慢；复合相变材料的导热系数为0.59 W·m−1·K−1，是纯聚乙二醇导热系数（0.25 W·m−1·K−1）的2.36倍；泄漏测试对复合相变材料形状稳定性能进行了测试。研究结果表明，云母作为储热材料的支撑基体，与相变材料不发生化学反应，能够有效地解决相变材料相变过程泄漏和导热系数较低的问题，在储热领域中具有良好的应用潜力。
Mica was used as a supporting matrix for composite phase change materials (PCMs) in this work because of its distinctive morphology and structure. Composite PCMs were prepared using the vacuum impregnation method, in which mica served as the supporting material and polyethylene glycol (PEG) served as the PCM. Fourier transform infrared and X-ray diffraction analysis confirmed that the addition of PEG had no effect on the crystal structure of mica. Moreover, no chemical reaction occurred between PEG and mica during the vacuum impregnation process, and no new substance was formed. The maximum load of mica-stabilized PEG was 46.24%, the phase change temperature of M400/PEG was 46.03°C, and the latent heat values of melting and cooling were 77.75 and 77.73 J·g−1, respectively. The thermal conductivity of M400/PEG was 2.4 times that of pure PEG. The thermal infrared images indicated that the thermal response of M400/PEG improved relative to that of pure PEG. The leakage test confirmed that mica could stabilize PEG and that M400/PEG had great form-stabilized property. These results demonstrate that M400/PEG has potential in the field of building energy conservation.
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