硬脂酸／MCM-41复合相变材料研究

Study on stearic acid/MCM-41 phase change composite

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。

Taking stearic acid as the phase change material, MCM-41 mesoporous silica as the carrier, the paraffin/ MCM-41 phase change energy storage materials are synthesized successfully via solution immersion. The morphology is observed by scan electron microscopy （SEM） and transmission electron microscopy （TEM） images. The thermal stability is characterized by thermal gravimetry/differential scanning calorimeter （TG-DSC）. The compatibility of the composite is determined by FT-IR. The results show that, paraffin/MCM-41 phase change composite assumes mesoporous structure. The maximum amount of stearic acid in the phase change composite is 50% wt. The phase change temperature and latent heat are 57.8℃ and 276.4 J/g, respectively. Moreover, the stearic acid is only imbedded into the framework of mesoporous molecular sieves without chemical reaction. The formed phase change composite has good thermal reliability and compatibility, which makes it promising as an effective latent heat thermal energy storage material.