Hybrid MoS₂/h-BN Nanofillers As Synergic Heat Dissipation and Reinforcement Additives in Epoxy Nanocomposites

Abstract

Two-dimensional (2D) nanomaterials as molybdenum disulfide (MoS), hexagonal boron nitride (h-BN), and their hybrid (MoS/h-BN) were employed as fillers to improve the physical properties of epoxy composites. Nanocomposites were produced in different concentrations and studied in their microstructure, mechanical and thermal properties. The hybrid 2D mixture imparted efficient reinforcement to the epoxy leading to increases of up to 95% in tensile strength, 60% in ultimate strain, and 58% in Young's modulus. Moreover, an enhancement of 203% in thermal conductivity was achieved for the hybrid composite as compared to the pure polymer. The incorporation of MoS/h-BN mixture nanofillers in epoxy resulted in nanocomposites with multifunctional characteristics for applications that require high mechanical and thermal performance.

Enhanced thermal conductivity and mechanical properties of hybrid MoS2/h‐BN polyurethane nanocomposites

“…This type of fiber is not conductive by itself, however the thermal conductivity of composite obtained from h‐BN/kenaf fiber/epoxy with 43.6 wt % of h‐BN was 72.3% higher than only kenaf/epoxy. We previously observed the same trend of high gains in thermal conductivity with hybrid MoS 2 /h‐BN in an epoxy based nanocomposites . In the epoxy composites, it was observed increases up to 203%, with 1.0 wt % of hybrid MoS 2 /h‐BN when compared to pure epoxy, which indicates that for elastomeric polyurethane the effect is still 3.7 times more pronounced.…”

“…This fact is an great evidence that a strong adhesion between the hybrid 2D nanosheets and polyurethane system was established, indicating that crosslinked polymers chains probably were assist by the addition of h‐BN, MoS 2 , and MoS 2 /h‐BN nanosheets . This trend can be explained by the values of crosslink density (CD) obtained by DMA using the procedures proposed by Lakshmi and coworkers .…”

“…Different nanocomposites of h‐BN, MoS 2 , and hybrid MoS 2 /h‐BN containing 0.25, and 0.50 wt % of these nanofillers in the PU matrix were produced, which means that for each 100 g of polymer, 0.25 and 0.50 g of nanofillers were used, respectively. The composites of MoS 2 /h‐BN in PU were prepared using a mass ratio of 1:1 between MoS 2 and h‐BN nanosheets …”

“…In a previous work, our group demonstrated the use of hybrid MoS 2 /h‐BN as nanofillers in a thermosetting polymer. Excellent improvements in the thermal and mechanical properties at low concentrations of the hybrid in epoxy were obtained, when compared with their individual 2D counterparts …”

“…The development of polymer composites with hybrid 2D nanostructures has experienced great challenges because of the issues associated with the poor dispersion and lack of proper interfacial engineering . However, the highest aspect ratio in 2D nanomaterials in homogeneous dispersions, associated with a strong interface between them and host system, are important features for effective physical properties transference .…”