采用静电纺丝技术成功制备了以5种脂肪酸二元低共熔混合物（LA-MA、LA-SA、MA-PA、MA-SA、PA-SA）为固液相变材料,聚对苯二甲酸乙二酯（PET）为支撑材料的定形相变复合纤维。研究了不同种类的脂肪酸二元低共熔物对复合相变纤维的形貌结构、储热性能以及力学性能的影响。研究结果表明这5种定形相变复合纤维的表面均呈现褶皱的形貌特征,同时纤维直径也明显增大。热分析结果表明当改变纤维中脂肪酸二元低共熔物的种类时,复合相变纤维的熔化温度和熔化焓值均随之而变化,其中熔化温度最低为33.23℃,最高为52.82℃,熔化焓值最低为62.75kJ/kg,最高为94.76kJ/kg。力学性能测试结果表明,由于脂肪酸二元低熔物的加入复合相变纤维的拉伸强度减小,断裂伸长率增大。
Form-stable phase change fibers based on binary fatty acid eutectic/PET composites in which the five binary fatty acid eutectics serve as solid-liquid phase change material and PET acts as a supporting material, were successfully fabricated through electrospinning. The effects of the types of the binary fatty acid eutectics on morphological structures, thermal energy storage properties and tensile properties of the composite phase change fibers were studied. The results revealed that form-stable phase change composite fibers possessed the wrinkled surfaces morphologies with fiber diameters significantly larger than that of neat PET fibers. Thermal analysis results showed that the melting temperatures and enthalpies of the composite fibers varied with the types of binary fatty acid eutectics. The lowest and highest melting temperatures were 33.23 and 52.82°C, re- spectively, whilst the lowest and highest enthalpies were 62.75 and 94.76kJ/kg, respectively. The tensile testing results indicated that the tensile strength of the composite phase change fibers decreased, while the elongation at break of the composite fibers increased due to the loading of the binary fatty acid eutectic.
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