Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (2): 20210593.doi: 10.7503/cjcu20210593

• Material Chemistry • Previous Articles     Next Articles

Preparation of High Thermal Conductivity Phase Change Monolithic Materials Based on Pickering Emulsion Stabilized by Surface Modified Graphene Oxide

YANG Junge, GAO Chengqian, LI Boxin, YIN Dezhong()   

  1. School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an 710072,China
  • Received:2021-08-18 Online:2022-02-10 Published:2021-11-11
  • Contact: YIN Dezhong E-mail:dezh_yin@nwpu.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2016YFC0301302)

Abstract:

Filling with nano-materials is a common method to improve the thermal conductivity of phase change composites, and the dispersibility of nanomaterials is a key factor in enhancing thermal conductivity. In this paper, surface-initiated atom transfer radical polymerization(SI-ATRP) was used to modify grapheme oxide(GO) firstly, and then the modified GO was employed to stabilize Pickering high internal phase emulsion. Finally GO/paraffin monolith with high thermal conductivity was obtained by one step polymerization. SI-ATRP introduced molecular brushes on GO to improve the dispersion of GO, which endowed the monolith with excellent heat conduction enhancement effect, even under low GO content. When the content of GO was only 0.4% of the composite material, its thermal conductivity(3.968 W?m-1?K-1) was greatly improved compared to the thermal conductivity of pure paraffin(0.608 W?m-1?K-1). The leakage rate of phase change material was only 1.1%—1.3% after 1000 cycles, showing good shape stability and thermal reliability. The prepared shape-stable phase change material has potential applications in temperature control and energy storage applications.

Key words: Shaped phase change material, High internal phase emulsion, Graphene oxide, Thermal conductivity

CLC Number: 

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