Preparation and properties of fatty acid/alcohol composite phase change mortar

In order to explore the phase change materials (PCM) for thermal energy storage in the field of building, a ternary composite phase change material lauric acid (LA)-myristic acid (MA)-tetradecyl alcohol (TD) (LMT844) was produced through the Python based on the theory of low eutectic fusion. The melting and the freezing temperature are 28.84 C and 27.36 C, latent heat of the melting and freezing are 194.8 J/g and 193.8 J/g, respectively. Meanwhile, in order to enhance the thermal conductivity, expanded perlite (EP) and carbon fiber (CF) were introduced to prepare the CF-LMT844/EP, which were in -bonded to magnesium oxychloride cement (Magnesium oxychloride cement, MOC) and CF-LMT844/EP-MOC mortar was prepared with the optimal mixing amount of CF-LMT844/EP is 20%. The compressive strength is 25.2 MPa, flexural strength is 6.5 MPa, thermal conductivity is 1.773 W/(m.K), melting temperature and latent heat are 29.15 C and 22.71 J/g, respectively. Through analysis of microstructure, chemical analysis and crystal structure, it is confirmed that CF-LMT844/EPMOC mortar is a physical mixture among the CF-LMT844/EP aggregate, MOC hydration product and the remaining aggregate without any chemical reaction, which have a small heat weight loss within the range of 0-100 C can maintain good performance in practical application.