Searching for effective compatibilizing agents for the preparation of poly(ether ether ketone)/graphene nanocomposites with enhanced properties
2018
Martínez-Gómez, A. | Quiles-Díaz, S. | Enrique-Jimenez, P. | Flores, A. | Ania, F. | Gómez-Fatou, M.A. | Salavagione, H.J.
The homogeneous dispersion of graphene into poly(ether ether ketone)(PEEK) remains a challenging task mostly due to the resistance of PEEK to most common organic solvents. The present investigation describes a careful selection of compatibilizing agents that allows effectively dispersing graphene into PEEK. Polyetherimide (PEI), polysulfone, (PSU), poly(1,4-phenylene ether-ether-sulfone) (PEES) and sulfonated PEEK (SPEEK) are considered as potential compatibilizers and the mechanical, thermal and electrical properties of PEEK/graphene nanocomposites with different filler contents are evaluated. Significant electrical conductivity values are obtained for the nanocomposite with SPEEK (σ > 0.01 S.cm⁻¹ at 4 wt.% filler content) and the one incorporating PEI exhibited a percolation threshold below 2 wt. %. Finally, the nanocomposites including SPEEK, PEI and PEES show a clear enhancement of the mechanical properties with increasing graphene content. Hence, nanocomposites incorporating PEI and SPEEK as compatibilizers displayed optimized electrical and mechanical properties, in addition to a thermal stability up to 550°C.
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