化工学报 ›› 2023, Vol. 74 ›› Issue (6): 2680-2688.DOI: 10.11949/0438-1157.20230231

• 材料化学工程与纳米技术 • 上一篇    下一篇

PEG-EG固-固相变材料的制备和性能研究

李振(), 张博, 王丽伟()   

  1. 上海交通大学制冷与低温工程研究所,上海 200240
  • 收稿日期:2023-03-13 修回日期:2023-06-01 出版日期:2023-06-05 发布日期:2023-07-27
  • 通讯作者: 王丽伟
  • 作者简介:李振(1998—),男,硕士研究生,zhen_li@sjtu.edu.cn
  • 基金资助:
    国家杰出青年科学基金项目(51825602)

Development and properties of PEG-EG solid-solid phase change materials

Zhen LI(), Bo ZHANG, Liwei WANG()   

  1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2023-03-13 Revised:2023-06-01 Online:2023-06-05 Published:2023-07-27
  • Contact: Liwei WANG

摘要:

针对固-液相变材料易泄漏和热导率较低的问题,提出了聚乙二醇(PEG)固-固相变的复合材料。复合材料由不同比例、热导率较大的膨胀石墨(EG)骨架与PEG化学枝接得到。研究结果表明,EG质量分数为10%时,复合相变材料仍存在泄漏现象,而EG质量分数为20%、30%时不再有泄漏现象,复合材料表现为固-固相变。另外,复合材料的热导率随EG含量的增加而增大,其中EG质量分数为30%时,复合材料的热导率最高,为8.031 W·m-1·K-1,是纯相变材料热导率(0.289 W·m-1·K-1)的27.79倍。经历50次循环后,所有复合相变材料的相变温度和相变焓均未有明显变化,证明其具有良好的热稳定性。考虑综合性能,EG的质量分数为20%时,复合相变材料性能最佳,定形效果良好,相变焓(138.30 J·g-1)和结晶度(88.6%)较高,热导率也可以达到6.870 W·m-1·K-1

关键词: 膨胀石墨, 聚乙二醇, 相变, 化学枝接, 热传导, 复合材料

Abstract:

Aiming at the problems of easy leakage and low thermal conductivity of solid-liquid phase change materials, a polyethylene glycol (PEG) solid-solid phase change composite material was proposed. The composite material is obtained by chemical grafting of expanded graphite (EG) framework with different proportions and high thermal conductivity and PEG. The results show that the composite phase change material has a leakage phenomenon when the mass fraction of EG is 10%, while there is no more leakage phenomenon when the mass fraction of EG is 20% and 30%. In addition, the thermal conductivity of the composites increased with the increment of EG content. The highest thermal conductivity of 8.031 W·m-1·K-1 was obtained with the EG mass fraction of 30%, which was 27.79 times that of the pure phase change material (0.289 W·m-1·K-1). After 50 cycles, the phase change temperature and enthalpy of all composite materials did not change significantly, which proved the excellent thermal stability. Considering the comprehensive performance, under the condition of the optimal EG mass fraction of 20%, the phase change composite is form-stable and own high phase change enthalpy (138.30 J·g-1), high crystallinity (88.6%), and high thermal conductivity (6.870 W·m-1·K-1).

Key words: expanded graphite, polyethylene glycol, phase change, chemical graft, heat conduction, composite material

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