Abstract
A solvent-free ionic carbon nanotube (CNT) nanofluid with about 80 wt.% organic content was synthesized by oxidation of CNTs with mixed acid followed by a surface reaction with PEG-substituted tertiary amine. The CNT nanofluid and the pristine CNTs were introduced to polyurethane (PU) by melt-blending. The structures and properties of the nanofluid and the nanocomposites were investigated. The results show that the CNT nanofluid is in a viscous liquid state at room temperature and is stable and soluble in both aqueous and organic solvents. The CNT nanofluid distributes homogenously in the PU matrix. Due to the high content organic chains on the CNT surfaces, the breaking strength and elastic modulus of the nanocomposite decrease slightly but with about 100 % increase of breaking elongation and 50 % increase of toughness. Better dispersion of the nanofluid leads to more improvement of electrical conductivities of the composite. The solvent-free ionic nanofluid will be an excellent nanofiller in the nanocomposites.
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