Enhanced Thermal Conductivity of Segregated Poly(vinylidene fluoride) Composites via Forming Hybrid Conductive Network of Boron Nitride and Carbon Nanotubes

Abstract

This work placed an emphasis that constructing segregated boron nitride (BN)/carbon nanotube (CNT) hybrid network brought an immense benefit to enhance the thermal conductivity (TC) of poly­(vinylidene fluoride) (PVDF) composites. The segregated composites ((CNT + BN)@PVDF) showed a high TC of 1.8 W/mK at the total filler fraction of 25 vol %, outperforming PVDF composites with random structure (CNT/BN/PVDF) and segregated BN structure (BN@PVDF) by 169% and 50%, respectively. Infrared thermal images further demonstrated that (CNT + BN)@PVDF exhibited superior capability to dissipate heat compared to BN/PVDF. The segregated architecture increased the effective utilization of fillers and interfacial thermal resistance between neighboring BN platelets was reduced by the bridging effect of CNTs. Molding pressure and temperature governed the integration of segregated networks and thus the enhancement efficiency of TC. The design of hybrid segregated structure holds promise in a broad range of the preparation of thermal management materials.

A comprehensive review on mechanical, electromagnetic radiation shielding, and thermal conductivity of fibers/inorganic fillers reinforced hybrid polymer composites

“…Investigators selected functionalization of thermally conductive fillers to enhance the epoxy nanocomposites' values for a specific particle concentration. [ 284,285,320 ] Therefore, the increment of thermal conductivity is still insufficient. In this condition, the investigators tried to enhance the thermal conductivity values of the polymers by comprising two or more thermally conductive nanofillers such as SiC nanowires/graphene, Al/SiC, BN/SiC, BN/AlN, GNPs/MWCNTs, AlN/BN/SiC, and Al 2 O 3 /AlN.…”

Reduced Graphene Oxide Heterostructured Silver Nanoparticles Significantly Enhanced Thermal Conductivities in Hot-Pressed Electrospun Polyimide Nanocomposites

“…62 With increasing the Ag/rGO filler loading, the specific heat capacity of the (Ag/rGO)/PI nanocomposites presents little change, and the baseline from the DSC curve toward the endothermic direction gets smaller and smaller accordingly. 63 As seen from Table S1, in comparison to that of the pure PI matrix, the thermal decomposition temperature (T 5 and T 30 ) and the T Heat resistance index (T HRI ) value 64 of the (Ag/rGO)/PI nanocomposites are greatly enhanced with increasing the Ag/ rGO filler loading. The corresponding T HRI value of the (Ag/ rGO)/PI nanocomposites with 15 wt % Ag/rGO is enhanced from 272.7 °C for the pure PI matrix to 298.6 °C.…”

Recent Advances in Preparation, Mechanisms, and Applications of Thermally Conductive Polymer Composites: A Review

“…Although the λ of composites has been greatly improved in theory, its effect in practical applications is not satisfactory. At present, there are many commonly used methods to prepare thermally conductive composites, including chemical vapor deposition (CVD) [15], plasma treatment [16,17], freeze casting [18], solid-phase extrusion (SPE) [19], the sol-gel method [20], blending method [21], hot-pressed forming method [22,23], forced network assembly [24][25][26], salt template [27], vacuum-assisted filtration [28], and ultrasonic forced infiltration [29][30][31], etc. Many researchers have paid more attention to the study of thermally conductive polymer composites (TCPCs) with outstanding comprehensive properties.…”