MA-PA复合EG相变材料的研制及热性能

Development and Thermal Performance of MA-PA Phase Change Material Composited EG

以十四烷酸(MA)、十六酸(PA)为相变材料单体,制备了系列二元低共熔混合物(MA-PA),再以膨胀石墨(EG)为基体,采用多孔吸附法制备出MA-PA/EG复合相变材料.通过DSC、冷热加速循环和蓄、放热实验,研究了MA-PA/EG材料的热性能.结果表明,在MA-PA与EG最佳质量配比为15∶1的条件下,MA-PA/EG的熔化温度和凝固温度分别为44.99℃和44.42℃,熔化潜热和凝固潜热分别为156.9J/g和155.3J/g,EG对相变温度和潜热的影响不大;1 000次冷热加速循环后MA-PA/EG材料仍具有良好的热稳定性;EG可有效地提高MA-PA/EG材料的蓄、放热速率,且在固液相变过程中无液体侧漏.

The myristic acid（MA） and the palmitic acid（PA） were used as phase-change material monomers to obtain the MA-PA eutectic mixture,then the expanded graphite（EG） was used as primary structure to prepare the MA-PA/EG composite phase change material（PCM） by porous adsorption method.The performance of phase-change material was studied by the differential scanning calorimetry（DSC）,thermal accelerated circulation experiment and heat storing and releasing experiment.The conclusion is drawn that the best mass ratio of MA-PA and EG is 15：1,the melting temperature and solidification temperature of the MA-PA/EG composite PCM are 44.99 ℃ and 44.42 ℃,respectively,the latent heat of fusion and solidification is 156.9 J/g and 155.3 J/g,and there is little influence of adding EG.After 1 000 thermal accelerated circulation experiments,the heat stability of the material is still excellent.The EG can effectively improve the heat storing and releasing rate of the composite PCM,and there is little liquid side leakage during the solid-liquid phase-change process.