无机芯微胶囊相变储能材料制备、表征及其热物性研究

Synthesis,characterization and thermal analysis of micro-encapsulated inorganic phase change materials

通过原位聚合法合成了Na2HPO4.12H2O@尿醛树脂微胶囊相变储能材料。考察了尿素和甲醛的物质的量比对所得微胶囊结构和形貌特征的影响。采用扫描电镜(SEM)观察微胶囊的表观形态,透射电镜(TEM)观察微胶囊的微观结构,傅里叶红外光谱(FT-IR)表征了微胶囊复合材料的成分,激光导热仪测量了微胶囊的导热系数,差示扫描量热仪(DSC)表征了微胶囊的相变特性,热重分析仪(TGA)测定了微胶囊质量与温度间的关系。结果表明,所制备出的微胶囊为球状壳/核结构,包封良好,球体粒径约为500nm,相变潜热约为121.2J/g,在30～84℃的温度范围内失重量<10%。该微胶囊相变储能材料具有一定的应用前景。

Na2HPO4 · 12H2O@urea-formaldehyde resin microcapsules were prepared according to theln-SltU polymerization method in this study. The influence of the molar ratio of urea and formaldehyde on the structure and morphology of the resulting microcapsules on surface morphology has been investigated and found that it was strongly influences the morphology of the microparticles. The characterization of surface morphology and structure of the microcapsules was investigated by scanning electron microscopy （SEM） and transmission elec tron microscopy （TEM）. Fourier transform infrared spectroscopy （FT-IR） was employed to characterization of the components of the composite material of the microcapsule. The coefficient of thermal conductivity of the microcapsules was investigated by laser thermal conductivity. Phase change characteristics of the microcapsules were characterized by the differential scanning calorimetry （DSC）, and the thermal gravimetric analysis （TGA） measured the relationship between the weight and temperature of the microcapsules. The results showed that, the microcapsules have been successfully synthesized. DSP can be well encapsulated by the urea-formaldehyde resin, while the MEPCMs with good morphology and small particle size. The weight loss was less than 10 when temperature range heated from 30 to 80℃. The MEPCMs obtained have an interesting energy storage ca Dacitv of 121.2J/g under 41.5℃ that makes it suitable for different applications.