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首页> 美国卫生研究院文献>Materials >Expanded Graphite/Paraffin/Silicone Rubber as High Temperature Form-stabilized Phase Change Materials for Thermal Energy Storage and Thermal Interface Materials
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Expanded Graphite/Paraffin/Silicone Rubber as High Temperature Form-stabilized Phase Change Materials for Thermal Energy Storage and Thermal Interface Materials

机译：膨胀石墨/石蜡/硅橡胶作为用于热能存储和热界面材料的高温形状稳定相变材料

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In this work, expanded graphite/paraffin/silicone rubber composite phase-change materials (PCMs) were prepared by blending the expanded graphite (EG), paraffin wax (PW) and silicone rubber (SR) matrix. It has been shown that PW fully penetrates into the three dimensional (3D) pores of EG to form the EG/PW particles, which are sealed by SR and evenly embedded in the SR matrix. As a result of the excellent thermal stability of SR and the capillary force from the 3D pores of EG, the EG/PW/SR PCMs are found to have good shape stability and high reliability. After being baked in an oven at 150 °C for 24 h, the shape of the EG/PW/SR PCMs is virtually unchanged, and their weight loss and latent heat drop are only 7.91 wt % and 11.3 J/g, respectively. The latent heat of the EG/PW/SR composites can reach up to 43.6 and 41.8 J/g for the melting and crystallizing processes, respectively. The super cooling of PW decreased from 4.2 to 2.4 due to the heterogeneous nucleation on the large surface of EG and the sealing effect of the SR. Meanwhile, the thermal conductivity of the EG/PW/SR PCMs reaches 0.56 W·m ·K , which is about 2.8 times and 3.73 times of pure PW and pristine SR, respectively. The novel EG/PW/SR PCMs with superior shape and thermal stabilities will have a potential application in heat energy storage and thermal interface materials (TIM) for electronic devices.
机译：在这项工作中，通过将膨胀石墨（EG），石蜡（PW）和硅橡胶（SR）基质混合，制备了膨胀石墨/石蜡/硅橡胶复合相变材料（PCM）。已经显示，PW完全渗透到EG的三维（3D）孔中，形成EG / PW颗粒，这些颗粒被SR密封并均匀地嵌入SR基质中。由于SR出色的热稳定性和EG的3D孔产生的毛细作用力，因此EG / PW / SR PCM具有良好的形状稳定性和高可靠性。在150°C的烤箱中烘烤24小时后，EG / PW / SR PCM的形状几乎没有变化，它们的重量损失和潜热降分别仅为7.91 wt％和11.3 J / g。 EG / PW / SR复合材料的潜热在熔融和结晶过程中分别可以达到43.6和41.8 J / g。由于EG大表面上的异质形核和SR的密封作用，PW的过冷度从4.2降低到2.4。同时，EG / PW / SR PCM的热导率达到0.56 W·m·K，分别是纯PW和原始SR的约2.8倍和3.73倍。具有优异形状和热稳定性的新型EG / PW / SR PCM将在电子设备的热能存储和热界面材料（TIM）中具有潜在的应用。

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