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

Abstract

Nanocomposites based on molybdenum disulfide (MoS2), hexagonal boron nitride (h‐BN) and hybrid MoS2/h‐BN nanofillers with different wt % in elastomeric polyurethane (PU) were studied with respect to their microstructure, thermal and mechanical properties. Tensile tests showed increases up to 80% in Young`s modulus for both h‐BN and hybrid MoS2/h‐BN composites. These results agree with dynamic mechanical analysis tests, which confirm an increase of up to 106% in storage modulus for hybrid MoS2/h‐BN with 0.5 wt % content. When the hybrid MoS2/h‐BN nanofillers were incorporated into the polymeric matrix, increases up to 102% in crosslink density were observed, indicating that strong interactions between the hybrid nanofillers and PU were established. However, the most important synergistic effect between the mixture of MoS2 and h‐BN nanoadditives was the increase of up to 752% in thermal conductivity with respect to neat polymer. Therefore, hybrid composites based in two‐dimensional MoS2/h‐BN nanofillers with multifunctional attributes can be applied in advanced polymeric materials that require high mechanical and thermal performance. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46560.

Enhanced Thermo‐Mechanical Stiffness, Thermal Stability, and Fire Retardant Performance of Surface‐Modified 2D MoS2Nanosheet‐Reinforced Polyurethane Composites

“…Those epoxy composite showed major improvement in FR activity and mechanical property as compared to those of industrial epoxy composites due to the hybrid effect. In a recent report, Ribeiro et al . significantly improved thermal conductivity and mechanical properties of hybrid MoS 2 /h‐BN PU nanocomposites.…”

Thermal Conductivity Performance of 2D h-BN/MoS2/-Hybrid Nanostructures Used on Natural and Synthetic Esters

“…Among these 2D nanomaterials are hexagonal boron nitride (h-BN) and molybdenum disulfide (MoS 2 ), which are suitable for development of high-performance composites applied in several industrial and technological sectors due to their exceptional electrical, thermal, and mechanical properties [ 37 , 38 , 39 ]. In this sense, hexagonal boron nitride (h-BN) is investigated in this study, since it is applied to several substrates to reduce viscosity and increase thermal conductivity [ 7 , 24 , 37 , 38 , 39 , 40 , 41 ]. The capability of h-BN to improve the thermal conductivity of solid nanocomposites based on epoxy and polyurethane was previously reported by Ribeiro et al [ 37 , 38 , 39 ].…”

“…In this sense, hexagonal boron nitride (h-BN) is investigated in this study, since it is applied to several substrates to reduce viscosity and increase thermal conductivity [ 7 , 24 , 37 , 38 , 39 , 40 , 41 ]. The capability of h-BN to improve the thermal conductivity of solid nanocomposites based on epoxy and polyurethane was previously reported by Ribeiro et al [ 37 , 38 , 39 ]. Nonetheless, the application of h-BN to mineral oils, natural esters, and other fluids, is being studied [ 5 , 7 , 26 , 42 ].…”

Functionalized Boron Nitride Applications in Biotechnology

“…h-BN is also highly thermally and chemically stable and thus is also widely used for durable high-temperature crucibles, antioxidation lubricants, and protective coatings [1] and also has a wide range application in nanomedicine and biotechnology such as cancer therapies [3], drug delivery [4,5], biosensing [6][7][8], adjuvant in vaccines [9], and intracellular delivery [10,11]. Hexagonal boron nitride also can be incorporated in ceramics, alloys, resins, plastics, and rubbers to give them thermal and chemical stability and mechanical resistance as well [12][13][14][15]. BN nanomaterials (Figures 1 and 2), such as carbon nanotubes (CNT) and graphene, also are awakened as new perspectives in prophylactic, diagnostic, and therapeutic areas.…”