Phase change material (PCM) is useful for the storage and release of latent heat. However, its ability to conduct has hindered its engineering application. This study prepares a novel microencapsulated phase change material (MEPCM) by suspension polymerization. To improve the adhesion between the shell and the inorganic additive, triethoxyvinylsilane was incorporated copolymerizing with methyl methacrylate. Thermally conductive nanographite particle was added. This MEPCM was then incorporated into high-density polyethylene (HDPE) to form a series of thermally conductive PCM microcapsules that approached sphere shapes with diameters less than 2 μm. Thermal analysis showed that the thermal stability and heat resistance of the microcapsule were improved. The thermal conductivity of HDPE was increased by 39% to 0.6358 W/m ⋅K, and the surface resistivity was lowered to 2.78 × 105 Ω/sq after the addition of MEPCM. The temperature on the top of the composite tested was lower than pristine HDPE. This was close to the onset melting temperature of the MEPCM (38.5∘C), ∼5∘C lower than pure HDPE. The reduction is a significant improvement in temperature regulation. This enables MEPCMs to store and release heat much more effectively, and can thus be applied to medical construction materials to meet the temperature requirements of COVID-19 patients.

中文翻译：

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节能储热用导热微胶囊/高密度聚乙烯复合材料

相变材料 (PCM) 可用于储存和释放潜热。然而，它的导电能力阻碍了它的工程应用。本研究通过悬浮聚合制备了一种新型微胶囊相变材料（MEPCM）。为了提高外壳和无机添加剂之间的粘合力，加入三乙氧基乙烯基硅烷与甲基丙烯酸甲酯共​​聚。添加了导热纳米石墨颗粒。然后将这种 MEPCM 加入高密度聚乙烯 (HDPE) 中，形成一系列导热 PCM 微胶囊，这些微胶囊接近直径小于 2 的球形μ米。热分析表明，微胶囊的热稳定性和耐热性都有所提高。HDPE的导热系数提高了39%，达到0.6358 W/m ⋅K，表面电阻率降至2.78 × 105 Ω/sq 添加 MEPCM 后。测试的复合材料顶部的温度低于原始 HDPE。这接近 MEPCM 的起始熔化温度（38.5∘C），～5∘C低于纯 HDPE。这种降低是温度调节的显着改进。这使 MEPCM 能够更有效地储存和释放热量，因此可以应用于医疗建筑材料，以满足 COVID-19 患者的温度要求。