Advanced thermoplastic polyurethane/hexagonal boron nitride thermal conductors via elongational flow from the aspect of experiment and simulation. (December 2022)

• Record Type: Journal Article
• Authors: Jia, Shunheng; Huang, Lijing; He, Yue; Qu, Jin-Ping
• Is Part Of: Composites. Volume 163(2022)
• Publication Date: 2022-12
• Subjects: A. Polymer-matrix composites (PMCs) -- B. Thermal properties -- C. Process Simulation -- Peeling off; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2022.107212
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: In this work, a novel melt blending approach for fabricating thermoplastic polyurethane (TPU)/hexagonal boron nitride (h-BN) composites using an elongational flow method was proposed. With 50 wt% of h-BN, the thermal conductivity (TC) of composite produced by elongation flow is 2.9 W/(m·K), compared with 2.41 W/(m·K) for the composite produced by conventional shear flow method, indicating a significant improvement was obtained. The peeling of h-BN, which is responsible for increased TC, was proved and the peeling mechanism was proposed. Meanwhile, the effect of changed h-BN geometrical dimension during the peeling process on TC was investigated by lapped simulation. The result shows that thinner sheet thickness brings a higher lapped rate and a longer heat conduction path at the same h-BN content. Additionally, the importance of maintaining lateral dimensions is proved by the simulation. This strategy paved a new way to manufacture high thermal conductivity 2D nanosheet composites with a green and efficient method.