十酸-十四酸-十八酸/有机蒙脱土复合相变材料的制备与性能研究

Structure and property of capric-myristic-palmitic acid/organic montmorillonite composite phase change material

选用十酸、十四酸和十八酸制备的三元低共熔物为相变材料,有机改性蒙脱土为支撑材料,熔融浸渗法制备了十酸-十四酸-十八酸/有机蒙脱土复合相变材料。采用DSC、FT-IR、TG、SEM、冷/热循环试验和蓄/放热试验等方法对其结构和热性能进行研究,结果表明,DSC测试复合材料的相变温度21.06℃,相变潜热102.26J/g;FT-IR表明相变材料和支撑材料的结合为物理吸附;TG曲线表明复合材料在低于130℃时热稳定性良好;SEM试验显示相变材料很好的分散在支撑材料层间;冷/热循环试验表明复合材料经历1000次冷/热循环后有较好的热稳定性;蓄/放热试验说明复合材料具有显著的蓄/放热能力,应用于建筑节能领域,可减小室内环境大幅度波动,满足人们对室内温度高舒适度的要求。

A novel capric-myristic-palmitic acid/organic montmorillonite composite phase change material（CPCM）was prepared from phase change material（PCM）derived from a ternary eutectic which was a mixture of capric acid,myristic acid and palmitic acid,and organic modified montmorillonite as the support material by melt infiltration method.Different analytical methods,such as DSC,FT-IR,TG,SEM,cold/thermal cycling test and thermal storage/heat test methods were used to study the structure and thermal properties of material.The results were as follows：DSC study results showed that the composite had phase change temperature 21.06℃,and phase change latent heat 102.26J/g.FT-IR study showed that physical adsorption was a combination of PCM and the support material.TG curves showed that CPCM had good thermal stability below 130℃.SEM indicated that PCM was well dispersed among the supporting material layer.Cold/thermal cycling test showed that CPCM had good thermal stability over more than 1000 cycles of thermal cycling.Thermal storage/heat test showed that CPCM had significant storage and release capacity that will reduce the fluctuations of indoor environment,and met high comfort requirements for indoor temperature,and will be used in the field of building energy efficiency.