Abstract: Microencapsulated phase change materials（MicroPCMs）were synthesized through suspension polymerization using poly（methyl methacrylate）as the shell and ethylene glycole distearate（EGDS）as the core，and then the chemical structure，morphology，thermal storage and stability of microcapsules were investigated by FTIR，scanning electron microscope（SEM），differential scanning calorimetry（DSC）and thermogravimetry analysis（TGA）. When the addition amounts of BPO and DMA were 1%，0.2% respectively，the surface morphology of microcapsules with diameter in the range of 1—5 μm were perfect and the thermal stability of MicroPCMs was good. The thermal properties of the microcapsules revealed that the largest content of the core material was up to 64.6 %，and the phase change enthalpy of microPCMs was about 85.34 J/g.

Key words: PMMA, ethylene glycole distearate（EGDS）, suspension polymerization, phase change materials for energy storage

摘要： 以BPO-DMA为氧化还原引发剂，在室温下悬浮聚合法制备了核壳结构的乙二醇双硬脂酸酯（EGDS）- PMMA相变材料微胶囊。采用扫描电镜（SEM）、红外光谱仪（FTIR）、差示扫描量热仪（DSC）和热重分析仪（TG）表征了核壳结构微胶囊的形貌、化学结构及热性能。结果表明，当BPO加入量为1%，DMA为0.2% 时，所得微胶囊成均匀球形，粒径分布在1～5 μm范围；微胶囊相变潜热随芯壳比的增加而增大，最大相变潜热达85.34 J/g，芯材含量达64.6%，且相变材料的热稳定性显著增强。

关键词: 聚甲基丙烯酸甲酯, 乙二醇双硬脂酸酯, 悬浮聚合, 相变储能材料