Novel Shape-Stabilized Phase Change Materials Based on Paraffin/EPDM@Graphene with High Thermal Conductivity and Low Leakage Rate

The negatively charged phase change latex (PCL) was obtained by simultaneously emulsifying paraffin and ethylene propylene diene monomer (EPDM) into water. Graphene (GE) was positively modified using cetyltrimethylammonium bromide and was then introduced into the PCL. Because of electrostatic attraction, the positively charged graphene was tightly bonded with the negatively charged PCL particles. Paraffin/EPDM@graphene thermally conductive and shape-stabilized phase change materials (TSPCMs) were obtained by hot press vulcanization. The thermal conductivity of TSPCMs was up to 1.451 W·m–1·K–1, with an increase of 294% compared to that without graphene. The error between the actual enthalpy and the theoretical value of TSPCMs was −1.00%, and the leakage rate was only 0.621% after being heated for 48 h. Because of the combination of EPDM and GE, the prepared TSPCM exhibits excellent comprehensive performance, so it has great application potential in the field of thermal energy storage and thermal management of electronic devices.