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 154.7J/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.
Du Wenqing, Fei Hua, Gu Qingjun, Wang Linya, Liu Yulan, Wang Yan
. Preparation and property of binary composite phase change material based on expanded graphite[J]. New Chemical Materials, 2021
, 49(8)
: 233
-236
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.08.050
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