Thermal Stability Assessment of Erythritol Phase Change Material
Sugar alcohols,as high-performance medium-temperature phase change thermal storage materials,have attracted significant attention,and their thermal stability is an important material property parameter that restricts their practical use.This study focuses on erythritol and compre-hensively evaluates its thermal stability using three indicators:mass loss,melting point change,and melting enthalpy decay.Additionally,a kinetic model for assessing its thermal stability is estab-lished.The results show that the primary gaseous products of heated erythritol include various small molecules,while the solid products mainly consist of the formation of C=O bonds.A comparison of thermal stability characterization parameters such as mass loss,melting point,and melting enthalpy reveals that the melting enthalpy of erythritol decreases by 10.2％in the air atmosphere at 145℃ for 48 h,which is significantly higher than the changes observed in the other two indicators.Therefore,melting enthalpy decay is chosen as the evaluation indicator for erythritol's thermal stability.In a nitrogen(N2)atmosphere,the activation energy of the melting enthalpy decay model is determined to be 80.0 kJ-mol-1,with a logarithmic pre-exponential factor of 15.14 h-1.Based on the model,further analysis indicates that the half-life of erythritol's melting enthalpy at temperatures ranging from 120 to 140℃ is between 2401 to 7851 h.
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