Cellulose Nanofiber/Polyethylene Glycol Composite Phase Change Thermal Storage Gel Based on Solid-gel Phase Change

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science Pub Date : 2023-12-22 DOI:10.5755/j02.ms.35249

Yanghua CHEN, Tingting Wang, Yanlei Pei

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引用次数: 0

Abstract

In this paper, cellulose nanofiber (CNF)/ polyethylene glycol (PEG) composite aerogel phase change materials (CNPCMs) were prepared utilizing porous carrier support and freeze-drying. The solid-liquid phase change to solid-gel phase change was realized, which solved the problems of PEG flow, leakage, and shape instability. The physical properties and chemical compatibility of CNPCMs were studied, and the results showed that CNPCMs ensured the overall structure stability through internal hydrogen bonding, and they were only a physical bond with each other without chemical reaction. With the increase in PEG content, the thermal conductivity of CNPCMs increased from 0.22 W/m·K to 0.33 W/m·K. The thermal exposure experiment and thermogravimetric analysis (TGA) experiment have shown that CNPCMs have good shape stability at 75 ℃ and good thermal stability below 320 ℃. In summary, the experimental results indicated that the maximum content of PEG in CNPCMs was 78 % with an optimal content of 66.7 %. The sample corresponding to the optimal content was CNPCM2 with an enthalpy of 167.9 J/g for melting and 146.1 J/g for solidification. As a thermal storage material with good thermodynamic performance, CNPCM2 has enormous potential in the storage of solar collectors.

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基于固-凝胶相变的纤维素纳米纤维/聚乙二醇复合相变蓄热凝胶

本文利用多孔载体支撑和冷冻干燥技术制备了纤维素纳米纤维（CNF）/聚乙二醇（PEG）复合气凝胶相变材料（CNPCMs）。实现了固-液相变到固-凝胶相变，解决了 PEG 流动、泄漏和形状不稳定等问题。对 CNPCMs 的物理性质和化学相容性进行了研究，结果表明 CNPCMs 通过内部氢键保证了整体结构的稳定性，它们之间只是物理结合，不发生化学反应。随着 PEG 含量的增加，CNPCMs 的导热系数从 0.22 W/m-K 增加到 0.33 W/m-K。热暴露实验和热重分析（TGA）实验表明，CNPCM 在 75 ℃ 下具有良好的形状稳定性，在 320 ℃ 以下具有良好的热稳定性。总之，实验结果表明，CNPCM 中 PEG 的最大含量为 78%，最佳含量为 66.7%。最佳含量对应的样品是 CNPCM2，其熔化焓为 167.9 J/g，凝固焓为 146.1 J/g。作为一种热力学性能良好的蓄热材料，CNPCM2 在太阳能集热器的蓄热方面具有巨大潜力。

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来源期刊

Materials Science 工程技术-材料科学：综合

CiteScore

1.60

自引率

44.40%

发文量

审稿时长

4-8 weeks

期刊介绍： Materials Science reports on current research into such problems as cracking, fatigue and fracture, especially in active environments as well as corrosion and anticorrosion protection of structural metallic and polymer materials, and the development of new materials.