Abstract
With the increase of building energy consumption, the research on building energy-saving materials is imminent, and it is necessary to focus on the performance modification. In this work, capric acid-stearic acid-octadecanol/expanded graphite (CSOD/EG) shaped composite phase change materials (SCPCMs) were prepared for reducing the limitations of phase change temperature and liquid leakage of organic phase change materials (PCMs). A range of ternary mixtures of CSOD with various ratios were obtained, the ideal quality proportion of CSOD was first determined as 81.9:9.1:9, the crystallization temperature under this ratio was 23.9 °C, and then the enthalpy and phase change temperature were determined by DSC to be 161.74 J/g and 27.72 °C, respectively. Expanded graphite (EG) was chosen as a porous carrier medium, and CSOD was combined with EG to obtain CSOD/EG SCPCM. The analysis of results shows that the load ratio of EG to CSOD is 91.67 %, the phase change temperature of CSOD/EG is 27.06 °C, the enthalpy is 142.09 J/g, and the thermal conductivity (TCU) is 3.136 W/m∙K. Moreover, the results of XRD, FT-IR, SEM and other analysis show that CSOD is uniformly inhaled into porous EG without chemical reaction. In addition, CSOD/EG exhibits good thermal reliability and chemical structure stability after 1000 cycles, providing excellent durability in energy storage applications.
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