The electrical conductivity of the polyurethane elastomer was greatly increased from 10 ≡2 to ~10 ≥ S cm ≡in the 1 mass% nanotube composite and to 7 S cm ≡for the MWCNT-NH 2 buckypaper-based nanocomposite. 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 MWCNT-NH 2 sample contained only 0.5 mass% of amine groups, whereas MWCNT-COOH contained 5 mass% of carboxyl groups. Antônio Carlos, 6627, Pampulha, CP 702, CEP 31270-901 Belo Horizonte, MG, Brasil e-mail: 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). Silva Departamento de Química, Universidade Federal de Minas Gerais UFMG Av. Antônio Carlos, 6627, Pampulha, CP 702, CEP 31270-901 Belo Horizonte, MG, Brasil e-mail: Autor para correspondência: Glaura G. SilvaĪutor para correspondência Autor para correspondência: Glaura G. Thermoplastic polyurethane functionalized multi-walled carbon nanotube spray coating buckypaperĮlectrical conductivity and thermal properties of functionalized carbon nanotubes/polyurethane compositesĪline M. 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. Furthermore, the relative high content of functional groups in the MWCNT-COOH sample, which disrupt the sp²structure 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. The electrical conductivity of the polyurethane elastomer was greatly increased from 10-12 to ~10-5 S cm-1in the 1 mass% nanotube composite and to 7 S cm-1for the MWCNT-NH2 buckypaper-based nanocomposite. The MWCNT-NH2 sample contained only 0.5 mass% of amine groups, whereas MWCNT-COOH contained 5 mass% of carboxyl groups. 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).
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