液体石蜡/聚砜树脂/纳米SiO_(2)复合相变材料的制备及性能表征

Preparation and performance of liquid paraffin/polysulfone resin/nano-SiO_(2) composite phase change materials

采用溶剂挥发法合成一种新型的以液体石蜡为芯材、纳米SiO_(2)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SiO_(2)的量为5%时,微胶囊颗粒的粒度为最小的164.8μm,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SiO_(2)改性后的相变微胶囊化学结构未受影响;经纳米SiO_(2)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。

A novel type of microencapsulated phase change material(PCM)with a liquid paraffin wax core,a polysulfone shell,and a nano-SiO_(2)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-SiO_(2)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-SiO_(2). The particle size of the microcapsules increased by the modification of nano-SiO_(2),and their surface structure showed small voids. Meanwhile,their phase-change performance and thermal stability were improved.