Enhanced thermal conductivity and mechanical properties of hybrid MoS 2 /h‐BN polyurethane nanocomposites

• Published in: Journal of applied polymer science Vol. 135; no. 30
• Main Authors: Ribeiro, Hélio, Trigueiro, João Paulo C., Lopes, Magnovaldo C., Pedrotti, Jairo J., Woellner, Cristiano F., Silva, Wellington M., Silva, Glaura G., Ajayan, Pulickel M.
• Format: Journal Article
• Language: English
• Published: 10.08.2018
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.46560

ABSTRACT Nanocomposites based on molybdenum disulfide (MoS 2 ), hexagonal boron nitride (h‐BN) and hybrid MoS 2 /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 MoS 2 /h‐BN composites. These results agree with dynamic mechanical analysis tests, which confirm an increase of up to 106% in storage modulus for hybrid MoS 2 /h‐BN with 0.5 wt % content. When the hybrid MoS 2 /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 MoS 2 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 MoS 2 /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.