Preparation and thermal properties of erythritol-based phase change composite fibers

doi:10.12028/j.issn.2095-4239.2017.0056

Abstract

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

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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