Abstract Phase change materials are most potential candidates for storing solar thermal energy with large enthalpy and high exergy. However, the intrinsic drawback such as poor optical absorptive capacity, low thermal conductivity and poor tensile strength restrict the thermal efficiency of phase change materials. To overcome drawback, expanded graphite is used to encapsulate the paraffin then thermoplastic elastomer is used to mix with the powders with twin-screw extrusion technology. The highly flexible phase change composite shows a melting enthalpy of 124.6 J g−1 and a thermal conductivity of 2.2 W m−1 K−1 with 70% of expanded graphite/paraffin. The tensile strength of 2.1 MPa and a breaking elongation of 220%. This flexible phase change composite demonstrates good photo-thermal energy charging/discharging property and shows much larger exergy than traditional fluids in the solar thermal energy systems.

中文翻译：

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具有增强拉伸强度、导热性和光热性能的柔性相变材料

摘要 相变材料是最有潜力的大焓、高火用​​太阳能热储存候选材料。然而，诸如光吸收能力差、热导率低和抗拉强度差等固有缺陷限制了相变材料的热效率。为了克服缺点，膨胀石墨被用来包封石蜡，然后热塑性弹性体被用来通过双螺杆挤出技术与粉末混合。高度灵活的相变复合材料显示出 124.6 J g-1 的熔化焓和 2.2 W m-1 K-1 的热导率，其中含有 70% 的膨胀石墨/石蜡。抗拉强度为2.1 MPa，断裂伸长率为220%。