Investigating the thermal conductivity and flame-retardant properties of BN/MoS2/PCNF composite film containing low BN and MoS2 nanosheets loading

Lei Yang; Wei Xu; Xiaolong Shi; Menglin Wu; Ziyi Yan; Qing Zheng; Gongneng Feng; Li Zhang; Rong Shao

doi:10.1016/j.carbpol.2023.120621

Investigating the thermal conductivity and flame-retardant properties of BN/MoS₂/PCNF composite film containing low BN and MoS₂ nanosheets loading

Carbohydr Polym. 2023 Jul 1:311:120621. doi: 10.1016/j.carbpol.2023.120621. Epub 2023 Feb 4.

Authors

Lei Yang¹, Wei Xu¹, Xiaolong Shi¹, Menglin Wu¹, Ziyi Yan¹, Qing Zheng¹, Gongneng Feng¹, Li Zhang¹, Rong Shao²

Affiliations

¹ College of Marine and Bioengineering, Yancheng Institute of Technology, Yancheng 224051, China.
² College of Marine and Bioengineering, Yancheng Institute of Technology, Yancheng 224051, China. Electronic address: shaor@ycit.edu.cn.

PMID: 37028866
DOI: 10.1016/j.carbpol.2023.120621

Abstract

Cellulose has attracted considerable attention as a potential substitute for plastics. However, the flammability and high thermal insulation properties of cellulose contradict the unique requirements for highly integrated and miniaturized electronics i.e., rapid thermal dissipation and efficient flame retardancy. In this work, cellulose was first phosphorylated to achieve intrinsic flame-retardant properties, and subsequently treated with MoS₂ and BN, ensuring efficient dispersion throughout the material. Via chemical crosslinking, a sandwich-like unit was formed, in the order of BN, MoS₂, and phosphorylated cellulose nanofibers (PCNF). The sandwich-like units were further self-assembled, layer-by-layer, to successfully create BN/MoS₂/PCNF composite films exhibiting excellent thermal conductivity and flame retardancy, and comprised a low MoS₂ and BN loading. The thermal conductivity of the BN/MoS₂/PCNF composite film containing 5 wt% BN nanosheets was higher than that of neat PCNF film. The combustion characterization of BN/MoS₂/PCNF composite films revealed highly desirable properties that were far more superior than the BN/MoS₂/TCNF (TCNF, TEMPO-oxidized cellulose nanofibers) composite films. Moreover, the toxic volatiles that escaped from flaming BN/MoS₂/PCNF composite films were significantly reduced compared to that of the BN/MoS₂/TCNF composite film alternative. The thermal conductivity and flame retardancy of BN/MoS₂/PCNF composite films have promising application prospects in highly integrated and eco-friendly electronics.

Keywords: BN/MoS(2)/PCNF composite film; CO suppression; Flame retardant; Self-assembled; Thermal conductivity.