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以硬脂酸为相变材料,介孔分子筛MCM-41为载体,采用溶液浸渍法制备了硬脂酸/MCM-41复合相变储能材料。应用SEM和TEM测试了复合材料的微观结构,利用TG-DSC分析了复合材料的相变温度、相变潜热及相变可逆性,通过FT-IR对复合材料的兼容性进行了表征。结果表明,复合材料表面具有多孔结构,改善了复合材料的相变可逆性,复合相变储能材料中硬脂酸的最大质量分数为50%,相变温度为57.8℃,相变潜热为276.4 J/g。分析表明,硬脂酸与MCM-41间是简单的嵌合关系,复合材料具有良好的热稳定性和兼容性。
Stearic acid / MCM-41 composite phase change energy storage material was prepared by stearic acid as phase change material and mesoporous molecular sieve MCM-41 as carrier. The microstructure of the composites was tested by SEM and TEM. The phase transition temperature, phase transition latent heat and phase reversibility of the composites were analyzed by TG-DSC. The compatibility of the composites was characterized by FT-IR. The results show that the composite has a porous structure on the surface and the phase reversibility of the composite is improved. The maximum mass fraction of stearic acid in composite phase change energy storage material is 50%, the phase transition temperature is 57.8 ℃ and the latent heat of phase transformation is 276.4 J / g. The analysis shows that there is a simple chimeric relationship between stearic acid and MCM-41, and the composite has good thermal stability and compatibility.