Preparation and properties of lauric acid–stearic acid/expanded perlite composite as phase change materials for thermal energy storage

Abstract The binary eutectic of lauric acid–stearic acid (LA-SA) / expanded perlite (EP) composite phase change materials (PCMs) were prepared by vacuum impregnation. The structure and properties of the composite PCMs were characterized by FT-IR, SEM and DSC analysis. The results show that the binary eutectic of fatty acids have been composed with the porous skeleton expanded perlite completely in a physical method, the melting temperature of the composite PCMs is about 33.0 °C and latent heat is 131.3 J/g, and they have good thermal stability. The composite PCMs present good potential applications for thermal energy storage and conservation in buildings mainly due to their high latent heat and a suitable melting temperature.