Abstract Owing to their high heat absorption and release capacities, chemical and thermal stability, non-toxicity, two fatty acid alkyl esters (FAAEs), methyl palmitate (MP) and isopropyl palmitate (IPP), were investigated for their use as thermal energy storage (TES) material in a shape stabilized form. Four nanowebs were developed via coaxial electrospinning, using poly(acrylo nitrile) (PAN) or poly(methacrylic acid-co-ethyl acrylate) (PMEA) shell to envelope MP or IPP core. Scanning electron microscope (SEM), transmission electron microscope (TEM) images confirmed cylindrical nanofiber formation, demonstrating a coaxial sheath-core morphology. The phase change enthalpies of PAN-MP, PMEA-MP nanowebs, with average diameters of 259–289 nm, were 71 J g−1 and 86 J g−1 at 28–32 °C, and those of PAN-IPP, PMAE-IPP were 72 J g−1 and 60 J g−1 at 7–15 °C during heating cycle in differential scanning calorimeter (DSC) analyses. A composite including PAN-MP nanoweb performed enhanced thermo-physical properties than its control counterpart.

中文翻译：

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适用于可再生热能储存的脂肪酸烷基酯纳米网

摘要 由于两种脂肪酸烷基酯 (FAAE)、棕榈酸甲酯 (MP) 和棕榈酸异丙酯 (IPP) 具有高吸热和放热能力、化学和热稳定性、无毒等优点，因此研究了它们作为热能储存的用途。 (TES) 材料的形状稳定形式。通过同轴静电纺丝，使用聚（丙烯腈）（PAN）或聚（甲基丙烯酸-共-丙烯酸乙酯）（PMEA）壳包封 MP 或 IPP 核，开发了四个纳米网。扫描电子显微镜 (SEM)、透射电子显微镜 (TEM) 图像证实了圆柱形纳米纤维的形成，证明了同轴鞘芯形态。平均直径为 259-289 nm 的 PAN-MP、PMEA-MP 纳米网的相变焓在 28-32°C 下分别为 71 J g-1 和 86 J g-1，而 PAN-IPP 的相变焓为 在差示扫描量热仪 (DSC) 分析中，在加热循环期间，在 7–15 °C 下，PMAE-IPP 为 72 J g-1 和 60 J g-1。包含 PAN-MP 纳米纤维网的复合材料比其对照物表现出增强的热物理性能。