Enhanced durability of Viton seals: Carbon nanotube‐rubber co‐interlinked network improves thermal conductivity

Abstract The thermal conductivity of fluoroelastomer is a critical factor influencing the stability and lifespan of Viton seals utilized in harsh environments characterized by high temperatures and pressures. While the incorporation of carbon nanotubes (CNTs) into fluoroelastomers presents a promising solution, their tendency to agglomerate has hindered enhancements in thermal conductivity. To address this issue, a uniform thermal conductivity network was developed by incorporating modified carbon nanotubes into the Viton matrix. This innovation facilitated rapid heat transfer within Viton products, preventing potential failures caused by uneven internal heat distribution. After modification, carbon nanotubes with amino functional groups were uniformly dispersed within the fluorine rubber, overcoming agglomeration. They were also involved in crosslinking with the rubber, resulting in a network that improved the composite material's thermal conductivity efficiency by 42% and mechanical strength by 14%. Viton seals, designed with modified carbon nanotubes incorporated as a network, exhibited good thermal conductivity, offering a viable solution for extending the lifetime of Viton seals under harsh conditions. Highlights Hybridization modification of carbon nanotubes. Amino‐functionalized modification of CNTs. Establishment of CNTs‐fluoroelastomer co‐crosslinked networks. Excellent thermal conductivity of Viton seals. Long service life of Viton seals.