Dual-role of phosphonium - Based ionic liquid in epoxy/MWCNT systems: Electric, rheological behavior and electromagnetic interference shielding effectiveness

Bluma G. Soares , Nathan Riany , Adriana A. Silva , Guillerme M.O. Barra , Sébastien Livi (1)

1 IMP - Ingénierie des Matériaux Polymères

Epoxy networks with improved electrical properties were prepared by using the non covalently functionalized multi-walled carbon nanotube (MWCNT) combined with phosphonium ionic liquid (IL). This IL exerts the function of dispersant aid for the MWCNT as well as curing agent of epoxy prepolymer. The influence of the mixing procedure on the dispersion of the MWCNT was evaluated by rheological behavior of the uncured mixtures and by transmission electron microscopy (TEM) of the cured epoxy systems. In fact, the dispersion of MWCNT within the IL is a key parameter to provide better dispersion, higher conductivity and storage modulus. Thus, the effect of the MWCNT content on the electrical and rheological percolation has been discussed. Moreover, the electromagnetic interference shielding effectiveness (EMI SE) of some systems have been also investigated.

Mots clés: Multiwalled carbon nanotube; Epoxy network; Ionic liquid; Rheological properties; AC conductivity; EMI SE

Domaines: Polymères; Matériaux

Bluma G. Soares, Nathan Riany, Adriana A. Silva, Guillerme M.O. Barra, Sébastien Livi. Dual-role of phosphonium - Based ionic liquid in epoxy/MWCNT systems: Electric, rheological behavior and electromagnetic interference shielding effectiveness. European Polymer Journal, 2016, 84, pp.77-88. ⟨10.1016/j.eurpolymj.2016.09.016⟩. ⟨hal-01485590⟩