Thermal conductivity enhanced SiO2-Al2O3/PEG form-stable phase change material based on the sol-gel doping of aluminum isopropanol
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摘要: 以异丙醇铝(AIP)与正硅酸乙酯(TEOS)为溶胶前驱体、 聚乙二醇(PEG)为相变组分, 经超声辅助溶胶-凝胶过程制备了SiO2-Al2O3/PEG 导热增强型定形相变储能材料。利用FTIR和XRD对SiO2-Al2O3/PEG进行结构表征及结晶性能测定, 利用DSC与TGA研究其热性能与热稳定性, 利用显微热台与数码拍照技术测试材料的定形效果; 利用热导率仪测定了材料的导热系数。结果表明, SiO2-Al2O3/PEG的相变焓值可以达到100 J/g以上, 低于300 ℃时具有良好的热稳定性, 当SiO2-Al2O3/PEG中的铝硅质量比为0.2:1时, 其导热系数可达0.414 W/(m·K), 导热性能比纯PEG提高39.3%, 并具有良好的定形效果。Abstract: The thermal conductivity enhanced SiO2-Al2O3/PEG form-stable phase change composite was synthesized through the ultrasound assisted sol-gel method with aluminum isopropanol (AIP) and tetraethoxysilane as the sol precursor, and polyethylene glycol (PEG) as the phase change component. FTIR and XRD were used to characterize the structure and measure the crystallization properties of the SiO2-Al2O3/PEG. The thermal performance and thermal stability were analyzed by DSC and TGA. The form-stable performance was fixed by microscopic heating stage and digital photo technology. The thermal conductivity of the SiO2-Al2O3/PEG were measured by the thermal conductivity meter. The results show that the phase change enthalpy of the product reaches above 100 J/g, and the material has a good thermal stability within 300 ℃. When the mass ratio of Al to Si is 0.2:1, the thermal conductivity of the composite reaches 0.414 W/(m·K), which increases by 39.3%. Besides, it has an excellent form-stable performance.
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