摘要
膨胀石墨基二元复合相变材料具有相变过程无液相相变材料泄漏以及储能密度大等优点,并在建筑节能领域中具有较好的应用价值。首先,采用步冷曲线法确定CA-PA二元低共熔混合物的最佳配比为CA含量86%,相应的PA含量为14%,此时对应的共晶温度为22.1℃,通过差示量热(DSC)得到CA-PA的熔化温度与潜热分别为21.78℃与154.7J/g,该温度值与通过步冷曲线测得的结果相符合。再采用物理吸附法制备了癸酸-棕榈酸/膨胀石墨(CA-PA/EG)复合相变材料,其中CA-PA与EG的最佳质量比例为8∶1。利用扫描电镜(SEM)和红外光谱(FT-IR)研究了复合相变材料的微观形貌和结构特征,发现CA-PA依靠物理作用均匀分布于EG的孔隙中,且其经过1000次加速冷热循环后基本没有液相二元相变材料泄漏。因此,该CA-PA/EG复合相变材料可作为建筑节能和空调冷凝热回收等领域的候选材料。
Binary phase change materials of expanded graphite-based have the advantages of phase change process,non-liquid phase change materials leakage and high energy storage density,and it has good application value in the field of building energy conservation.Firstly,the optimum ratio of CA-PA binary eutectic mixture was determined by step cooling curve method,which was CA∶PA=86∶14,corresponding to crystallization temperature of 22.1℃.The melting temperature and latent heat of CA-PA were 21.78℃ and 154.7 J/g respectively by differential calorimetry(DSC),which was consistent with the results measured by step cooling curve.And then the capric-palmitic acid/expanded graphite(CA-PA/EG)composite phase change materials with the optimum mass ratio of 8∶1 was prepared by physical adsorption method.The microstructure and characterization of the materials were characterized by scanning electron microscope(SEM)and fourier transform infrared spectrometer(FT-IR).And it was found that CA-PA was uniformly distributed into the pores of EG by physical interaction.Moreover,there was almost no leakage of liquid binary phase change materials after 1000 thermal cycling.Therefore,the CA-PA/EG composites was a candidate material for building energy conservation and condensation heat recovery of air conditioning.
作者
杜文清
费华
顾庆军
王林雅
刘玉兰
王艳
Du Wenqing;Fei Hua;Gu Qingjun;Wang Linya;Liu Yulan;Wang Yan(School of Architectural and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000)
出处
《化工新型材料》
CAS
CSCD
北大核心
2021年第8期233-236,240,共5页
New Chemical Materials
基金
国家自然科学基金(51966004)
江西省自然科学基金项目(20171BAB206041)
江西理工大学清江青年优秀人才项目(JXUSTQJYX2017003)。
关键词
二元混合物
相变
复合材料
膨胀石墨
结构特性
binary mixture
phase change
composite material
expanded graphite
structural characteristic
