Phase change materials (PCMs) have aroused tremendous interest in building thermal management (BTM) owing to their operational simplicity and comparable energy storage density. However, the application of PCM-based BTM is generally hindered by the bottlenecks of low thermal conductivity and liquid leakage. To solve this problem, a novel thermally conductive and form-stable phase change composite (PCC) is prepared by employing n-Octadecane (ODE) as PCM, olefin block copolymer (OBC) as supporting material, and expanded graphite (EG) as thermally conductive additives. The characterization results show that the as-synthesized PCCs exhibit good physicochemical compatibility. The introduction of EG enables PCC an enhanced and antistrophic thermal conductivity. The radial thermal conductivities of PCCs reach up to 3.8–20.6 W/m∙K with EG loading of 5–25 wt%. The thermogravimetric analyzer (TGA) and leakage-proof analysis indicate that the resultant PCCs have a good thermal stability and the combination of OBC and EG greatly alleviated the leakage problem. In addition, BTM test shows that the indoor temperature of the PCM room is more stable and the maximum temperature differences between PCM room and reference room are 2.5 °C and 3.6 °C during the heating and cooling processes. These results indicate that the as-synthesized ODE-OBC/EG composites have significant potential for BTM application.

相变材料 (PCM) 因其操作简单和可比的能量存储密度而引起了建筑热管理 (BTM) 的极大兴趣。然而，基于PCM的BTM的应用普遍受到低导热性和液体泄漏的瓶颈的阻碍。为解决这一问题，以正十八烷 (ODE) 为 PCM，烯烃嵌段共聚物 (OBC) 为支撑材料，膨胀石墨 (EG) 为热导材料，制备了一种新型导热且形状稳定的相变复合材料 (PCC)。导电添加剂。表征结果表明，所合成的 PCCs 表现出良好的物理化学相容性。EG 的引入使 PCC 具有增强的和反自转的导热性。PCC 的径向热导率高达 3.8-20。6 W/m∙K，EG 负载量为 5–25 wt%。热重分析仪 (TGA) 和防泄漏分析表明，所得 PCC 具有良好的热稳定性，OBC 和 EG 的组合极大地缓解了泄漏问题。此外，BTM 测试表明，PCM 房间的室内温度更加稳定，在加热和冷却过程中，PCM 房间与参考房间的最大温差分别为 2.5°C 和 3.6°C。这些结果表明，合成的 ODE-OBC/EG 复合材料在 BTM 应用中具有巨大的潜力。BTM 测试表明，PCM 房间的室内温度更加稳定，在加热和冷却过程中，PCM 房间与参考房间的最大温差分别为 2.5°C 和 3.6°C。这些结果表明，合成的 ODE-OBC/EG 复合材料在 BTM 应用中具有巨大的潜力。BTM 测试表明，PCM 房间的室内温度更加稳定，在加热和冷却过程中，PCM 房间与参考房间的最大温差分别为 2.5°C 和 3.6°C。这些结果表明，合成的 ODE-OBC/EG 复合材料具有显着的 BTM 应用潜力。