Preparation and Thermal Properties of a New Low Eutectic Mixture of Myristic Acid–Palmitic Acid–Tetradecanol

Abstract

In this work, myristic acid−palmitic acid−tetradecanol (MA−PA−TD) ternary composite phase-change materials were prepared by the melt blending method. First, the MA−PA phase-transition temperature was 43.7 °C and the optimal mass ratio was 70:30 using the step cooling curve. The minimum eutectic point of MA−PA−TD was determined, the optimal mass ratio of MA−PA/TD was 54:46, and the phase-transition temperature was 28.6 °C. The phase-transition temperature and enthalpy of MA− PA composite phase-change materials were 45.98 °C and 171.6 J/g respectively, and the phase-transition temperature and enthalpy of MA−PA−TD were 29.64 °C and 162 J/g by differential scanning calorimetry (DSC), respectively. The thermal storage and exothermic experiments of MA−PA−TD phase-change materials were carried out; the temperature range of MA−PA−TD was consistent with that of the DSC experiment during the phase transformation, indicating that MA−PA−TD had good heat storage capacity. It was found by infrared spectrometry that the spectral curves of MA−PA−TD composite phase-change materials were simply superimposed with those of MA, PA, and MA−PA, and no chemical reaction occurred. The MA−PA−TD composite phasechange material had excellent stability after 300 cold and hot accelerated cycles.