Xiaolong Li^#, Xinxin Sheng^#, Yongqiang Guo, Xiang Lu*, Hao Wu, Ying Chen, Li Zhang and Junwei Gu*. Multifunctional HDPE/CNTs/PW composite phase change materials with excellent thermal and electrical conductivities. Journal of Materials Science & Technology, 2021, 86: 171-179. 2019IF=6.155.（1区材料科学Top期刊，中国科技期刊卓越行动计划-重点期刊类项目）

（https://doi.org/10.1016/j.jmst.2021.02.009）

Abstract

The risk of leakage and low thermal conductivity severely hinder the wide application of phase change materials (PCMs). In this work, the high-density polyethylene/carbon nanotubes (HDPE/CNTs) porous scaffolds were successfully fabricated via a sacrificial template method followed by the general melt blending and water solvent etching. Subsequently, a series of paraffin wax HDPE/CNTs/PW composite PCMs were obtained combined with the simple vacuum impregnation method. The obtained HDPE/CNTs porous scaffolds can effectively avoid the leakage of PW, meanwhile, the thermal conductivity and electrical conductivity of HDPE/CNTs/PW-3:7 are increased by 2.94 times and 13 orders of magnitude compared with the HDPE/PW-3:7 respectively, also, it exhibits high phase change enthalpy (153.95 J/g for melting enthalpy and 152.82 J/g for crystallization enthalpy). From the above perspectives, the HDPE/CNTs/PW-3:7 has promising potential value in the application of light-to-thermal conversion, electro-to-thermal conversion and thermal energy storage.

泄漏风险和低导热率严重阻碍了有机相变材料的广泛应用。本研究结合牺牲模板法、熔融共混法和水溶剂蚀刻法成功制备得到高密度聚乙烯（HDPE）/碳纳米管（CNTs）多孔骨架。随后，采用简单的真空浸渍法制备得到一系列HDPE/CNTs/石蜡（PW）复合相变材料。所得HDPE/CNTs多孔支架可有效避免PW的泄漏，且与HDPE/PW-3:7相比，HDPE/CNTs/PW-3:7的热导率和电导率分别提高了2.94倍和13个数量级，同时，该复合相变材料还具有较高的相变焓（熔化焓为153.95 J/g，结晶焓为152.82 J/g）。综上所述，HDPE/CNTs/PW-3:7在光热转换、电热转换及热能存储等领域具有广阔的应用前景。