液体石蜡/聚砜树脂/纳米SiO2复合相变材料的制备及性能表征

采用溶剂挥发法合成一种新型的以液体石蜡为芯材、纳米SiO₂为嵌体的聚砜树脂外壳相变微胶囊颗粒，并通过扫描电子显微镜、红外光谱、差示扫描量热仪、热失重分析对复合相变材料进行了结构及性能测试。结果表明，当添加纳米SiO₂的量为5 %时，微胶囊颗粒的粒度为最小的164.8 μm，并存在最优的相变焓和封装效率，熔化焓为88.03 J/g，结晶焓为86.48 J/g，封装效率57.37 %；纳米SiO₂改性后的相变微胶囊化学结构未受影响；经纳米SiO₂改性，微胶囊粒径增大，其表面结构产生小空隙现象，同时相变微胶囊的相变性能及热稳定性有明显改善。

Preparation and performance of liquid paraffin/polysulfone resin/nano?SiO2 composite phase change materials

A novel type of microencapsulated phase change material （PCM） with a liquid paraffin wax core， a polysulfone shell， and a nano?SiO₂ inlay was synthesized through a solvent evaporation method， and its structure and properties were characterized using SEM， FTIR， DSC， and TGA. The results indicated that the resultant microcapsules obtained the smallest particle size of 164.8 μm at a nano?SiO₂ addition amount of 5 wt %. There is an optimal enthalpy and encapsulation efficiency for the microcapsules， resulting in a melting enthalpy of 88.03 J/g， a crystallization enthalpy of 86.48 J/g， and a packaging efficiency of 57.37 %. The FTIR analysis indicated that the chemical structure of the phase?change microcapsules was not affected by the addition of nano?SiO₂. The particle size of the microcapsules increased by the modification of nano?SiO₂， and their surface structure showed small voids. Meanwhile， their phase?change performance and thermal stability were improved.