Electrical Conductivity and Thermal Properties of Functionalized Carbon Nanotubes/Polyurethane Composites
Silva, Glaura G.; Borges, Raquel S.; Castro, Vinícius G. de; Lima, Aline M. F.
http://dx.doi.org/10.1590/S0104-14282012005000017
Polímeros: Ciência e Tecnologia, vol.22, n2, p.117-124, 2012
Abstract
Multi-walled carbon nanotubes (MWCNTs) functionalized with amine and carboxyl groups were used to prepare polyurethane/ MWCNT nanocomposites in two distinct concentrations: a lower value of 1 mass% (spray coating) and a higher one of ~50 mass% (buckypaper based). The MWCNT-NH2 sample contained only 0.5 mass% of amine groups, whereas MWCNT-COOH contained 5 mass% of carboxyl groups. The MWCNT functionalized with low amine group content showed improved thermal properties when compared to neat thermoplastic polyurethane (TPU) and MWCNT-COOH based nanocomposites. The electrical conductivity of the polyurethane elastomer was greatly increased from 10–12 to ~10–5 S cm–1 in the 1 mass% nanotube composite and to 7 S cm–1 for the MWCNT-NH2 buckypaper-based nanocomposite. Furthermore, the relative high content of functional groups in the MWCNT-COOH sample, which disrupt the sp2 structure in the nanotube walls, led to inferior properties; for instance the conductivity of the buckypaper based composite is one order of magnitude lower when using MWCNT-COOH in comparison with the MWCNT-NH2. These results show the range of property design possibilities available with the elastomeric polyurethane nanocomposite by tailoring the functional group content and the carbon nanotube load.
Keywords
Thermoplastic polyurethane, functionalized multi-walled carbon nanotube, spray coating, buckypaper.
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