赤藓糖醇基相变复合纤维制备及热性能

doi:10.12028/j.issn.2095-4239.2017.0056

摘要/Abstract

摘要： 开发了相变温度为98.63 ℃的赤藓糖醇/硫脲共晶混合物，采用静电纺丝法制备赤藓糖醇、赤藓糖醇/硫脲和赤藓糖醇/木糖醇与聚乙烯醇的相变复合纤维，研究了石墨烯作为导热增强材料对复合材料形貌及热性能的影响。研究结果显示，复合材料各物质之间是物理结合，为表面光滑的圆柱状，直径为0.95～1.12 μm，并随石墨烯含量的增加而减小。3种复合材料相变焓分别为241.6 J/g、191.4 J/g和192.7 J/g。10次热循环后复合纤维仍能保持良好的形貌，焓值损失率分别为1.2%、0.5%和0.5%；添加10%（质量分数）石墨烯后导热系数分别提高了258%、312%和260%。研究结果表明，赤藓糖醇及其共晶相变复合材料不仅具有很好的化学和形貌稳定性，还表现出优异的热性能，在120～80 ℃储能领域中有着巨大的应用前景。

关键词: 赤藓糖醇, 共晶, 相变复合纤维, 储能, 石墨烯, 导热系数

Abstract: A erythritol-thiourea (TU) based binary phase change eutectic mixture was developed, which has a phase transition temperatures of 98.63 ℃. Using the phase change material (TU), PCM composite fibers were fabricated using electrospinning. In such composite fibers, erythritol (E), erythritol-thiourea (TU) and erythritol-xylitol (X) eutectic mixtures were the phase change materials, polyving akohol (PVA) acted as the supporting material and graphene was used to enhance the composite thermal conductivity. The effect of graphene on the morphology and thermal properties of composites was investigated. It was shown that there were no chemical reactions between the components and the composite were formed through physical interactions. The composites were cylindrical in shape with a smooth surface and had an average fiber diameters (AFDs) ranged from 0.95～1.12 μm. The AFDs of composites decreased with increasing graphene content as a result of the increase in the solution electric conductivity. The phase change enthalpies of the three composites were 241.6 J/g, 191.4 J/g and 192.7 J/g, respectively. The composites were shown to maintain the shape after 10 thermal cyclesand the changes to the latent heat were respectively 1.2%、0.5% and 0.5% after the thermal cycle. The addition of graphene (10%, weight ratio) markedly improved the thermal conductivity of composites, achieving 258%, 312% and 260%, respectively. These results demonstrated that the composites not only had a high stability both structurally and chemically, but also possessed excellent thermal properties.

Key words: erythritol, eutectic, phase change composite fiber, energy storage, graphene, thermal conductivity

车海山，陈迁乔，钟秦，何思. 赤藓糖醇基相变复合纤维制备及热性能[J]. 储能科学与技术, 2017, 6(4): 644-654.

CHE Haishan, CHEN Qianqiao, ZHONG Qin, HE Si. Preparation and thermal properties of erythritol-based phase change composite fibers[J]. Energy Storage Science and Technology, 2017, 6(4): 644-654.

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