【摘要】 本文采用熔融混合-物理吸附法制备硬脂酸-乙酰胺共晶混合物/膨胀石墨（SA-AC/EG）复合相变材料,所得复合材料中SA-AC与EG的最佳质量比为9:1.采用SEM、FTIR、DSC、和TPS方法表征复合相变材料的微观形貌、化学兼容性、相变特性和热导率.实验结果表明,SA-AC与EG之间是通过毛细力和表面张力作用复合,复合相变材料的熔化温度和凝固温度分别为66.94℃和58.02℃,熔化焓和凝固培分别为186.8 J/g和187.8 J/g.实验所得复合相变材料的热导率高达5.909 W·m^-1·K^-1,是原始相变材料（SA-AC）的17.58倍.经过500次加速加热冷却循环后,其热物性基本保持不变.因此,本实验所制备的SA-AC/EG复合相变材料具有较好的热稳定性和化学稳定性,是太阳能蓄热和工业余热回收利用的极具潜力的候选材料.更多还原

【Abstract】 Stearic acid-acetamide/Expanded graphite（SA-AC/EG） composite phase change material with the optimal mass ratio of SA-AC:EG equated to 9:1 was prepared with melting blending and physical adsorption method. The microstructure, chemical compatibility, phase transition characteristics and thermal conductivity of the composite were characterized by SEM, FTIR, DSC and TPS. As can be seen that the interaction between SA-AC and EG was capillary and surface tension forces. The melting and freezing temperatures were 66.94℃ and 58.02℃, while the corresponding phase change enthalpies were 186.8 J/g and 187.8 J/g. The thermal conductivity of the composite was up to 5.909 W·m^-1·K^-1, which was 17.58 times to the pure SA-AC eutectic mixture. The thermo-physical properties of the composite after 500 thermal cycling maintained almost constant.Therefore, the SA-AC/EG composite obtained in this study with good thermal and chemical stability,was a potential candidate for solar energy heat storage and industrial waste heat recycle.更多还原