Thermal energy storage (TES) composites were prepared by employing expanded graphite (EG) stabilized paraffin as phase change material (PCM) and wood flour/high density polyethylene (WF/HDPE) as matrix. The morphology and structure of EG and form-stable phase change material (FSPCM) were investigated by scanning electron microscopy (SEM), X-ray diffractometer (XRD) and mercury intrusion porosimetry. The fabricated TES composites with different FSPCM types and contents were characterized by differential scanning calorimetry (DSC), thermogravimetric (TG), infrared thermography and laserflash thermal analysis. Physical and mechanical strength were also evaluated. The results showed that: (1) the EG had abundant pores and most of the pores were below 26 μm, the EG stabilized paraffin material showed perfect stability without any chemical reactions; (2) thermal performance indicated that the TES composites had efficient temperature-regulated ability, but thermal durability need to be further enhanced; (3) addition of paraffin and EG destroyed the interface bonding of the TES composites and mechanical properties appeared slight decrease; (4) the satisfying thermal performance and acceptable mechanical property indicating the TES composites can be used as building material for temperature conditioning.

通过使用膨胀石墨（EG）稳定的石蜡作为相变材料（PCM）和木粉/高密度聚乙烯（WF / HDPE）作为基质来制备热能存储（TES）复合材料。用扫描电子显微镜（SEM），X射线衍射仪（XRD）和压汞法研究了EG和形状稳定相变材料（FSPCM）的形貌和结构。通过差示扫描量热法（DSC），热重法（TG），红外热成像和激光闪光热分析对具有不同FSPCM类型和含量的TES复合材料进行了表征。还评估了物理和机械强度。结果表明：（1）EG气孔丰富，大多数气孔小于26μm，EG稳定的石蜡材料具有良好的稳定性，无任何化学反应；（2）热性能表明TES复合材料具有有效的温度调节能力，但其热耐久性有待进一步提高。（3）石蜡和EG的加入破坏了TES复合材料的界面结合，力学性能略有下降；（4）令人满意的热性能和可接受的机械性能表明TES复合材料可用作温度调节的建筑材料。