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.

中文翻译：

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基于石蜡/ EPDM @石墨烯的新型形状稳定相变材料，具有高导热率和低泄漏率

通过同时将石蜡和乙烯丙烯二烯单体（EPDM）乳化到水中来获得带负电的相变胶乳（PCL）。使用十六烷基三甲基溴化铵对石墨烯（GE）进行正性修饰，然后将其引入PCL。由于静电吸引，带正电的石墨烯与带负电的PCL颗粒紧密结合。通过热压硫化获得石蜡/ EPDM @石墨烯导热和形状稳定的相变材料（TSPCM）。TSPCM的导热率高达1.451 W·m ^–1 ·K ^–1与没有石墨烯的材料相比，增加了294％。实际焓值与TSPCM理论值之间的误差为-1.00％，加热48小时后的泄漏率仅为0.621％。由于EPDM和GE的结合，制得的TSPCM具有优异的综合性能，因此在电子设备的热能存储和热管理领域具有巨大的应用潜力。