In this work, shape-stabilized solid-solid phase change materials (PCMs) were fabricated by simply electrospinning polyethylene glycol (PEG) and polyvinyl alcohol (PVA). Owing to the strong hydrogen bonds and entanglement between those molecular chains of PEG and PVA, PEG was packaged by PVA. The morphological structures, thermal stability and thermal energy storage properties of those fibers were investigated. SEM results showed that those electrospun PVA/PEG composite membranes hold a three-dimensional nonwoven web structure even the content of PEG as high as 70%. The thermal energy storage ability of those composite fibers increased with the increase of the content of PEG. The heat enthalpies of PEG/PVA = 7/3 were as high as 78.806 J/g. Moreover, those composite fibers had excellent thermal stability. After 100 heating and cooling cycles, there was almost no obvious change in the melting enthalpy and crystallization enthalpy. Those fibers still maintained good thermal regulation. The simple preparation process, low cost of raw materials and excellent stability endow the PCMs great utilization potentiality in smart textile and energy storage systems.

中文翻译：

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电纺聚乙二醇/聚乙烯醇复合纳米纤维膜作为形状稳定的固-固相变材料

在这项工作中，通过简单地电纺聚乙二醇（PEG）和聚乙烯醇（PVA）来制造形状稳定的固-固相变材料（PCM）。由于PEG和PVA的那些氢键之间有很强的氢键和缠结，所以用PVA包装了PEG。研究了这些纤维的形态结构，热稳定性和储热性能。SEM结果表明，那些电纺PVA / PEG复合膜即使在PEG含量高达70％时仍具有三维无纺网结构。这些复合纤维的热能储存能力随着PEG含量的增加而增加。PEG / PVA = 7/3的热焓高达78.806 J / g。而且，这些复合纤维具有优异的热稳定性。经过100次加热和冷却循环后，熔融焓和结晶焓几乎没有明显变化。这些纤维仍保持良好的热调节。制备工艺简单，原料成本低廉，稳定性好，使PCM在智能纺织和储能系统中具有巨大的利用潜力。