Abstract
Given the growing energy demands, organic phase change materials (PCMs) have been widely explored, with leakage and high phase change enthalpy being primary concerns for practical storage applications. In this study, micro-crosslinked PCMs were prepared using polyethylene glycol (PEG), poly (butylene terephthalate) (PBT), trimesic acid (TA) and adipic acid (AA) through simple esterification and transesterification, firstly. To prevent the leakage of myristic acid (MA) during its solid-liquid phase change, micro-crosslinked PCMs were then used as encapsulation materials and melting-blended with MA to produce solid-solid full-phase change composites (FPCCs). The resulting FPCCs showed superior processability due to the micro-crosslinked structure of encapsulation materials and plasticization effect of MA with low molecular weight. All FPCCs exhibited a single phase change temperature despite the significant difference in phase change temperatures between the micro-crosslinked PCMs and MA. Notably, the actual enthalpy of all FPCCs was higher than their theoretical enthalpy, with FPCCs-3 showing a 12.5 % increase over its theoretical value. The onset and final decomposition temperatures of MA in FPCCs were enhanced by at least 34.6 % and 10.6 %, respectively, compared to those of pure MA. The hydrogen bonding interactions between the carboxyl groups of MA and oxygen atoms of PEG segments are responsible for these extraordinary properties.
Published Version
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