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- Título:
- NMR study of styrene-butadiene rubber (SBR) and TiO2 nanocomposites
- Universidade Federal de São Carlos (UFSCar)
- Ctr Technol
- Universidade Estadual Paulista (UNESP)
- 0142-9418
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
- CNPq: 555644/2006-5
- The chemical behavior of styrene-butadiene rubber (SBR) and of the SBR/TiO2 and photodegraded SBR/TiO2 nanocomposites was investigated through nuclear magnetic resonance spectroscopy (NMR) in the solid state with magic angle spinning (MAS). The C-13 cross polarization/magic angle spinning (CP/MAS) routine spectrum allowed us to obtain information on the polymer microstructure and also to evaluate the domain mobilities. The variation contact time and the proton spin-lattice relaxation time in the rotating frame (T,pH) were determinant factors to evaluate the dynamic molecular motion. The NMR spectrum of the nanocomposites was dislocated 5 ppm to higher chemical shift, indicating the presence of a strong interaction between the polymer chains and the TiO2 nanoparticles. The VTC experiment showed a rigid domain in the SBR/TiO2 photodegraded nanocomposite due to cross-linking reactions. (C) 2009 Elsevier Ltd. All rights reserved.
- 1-Ago-2009
- Polymer Testing. Oxford: Elsevier B.V., v. 28, n. 5, p. 490-494, 2009.
- 490-494
- Elsevier B.V.
- NMR
- Carbon-13 solid state
- Nanocomposites
- Photodegradation
- http://dx.doi.org/10.1016/j.polymertesting.2009.03.011
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/25284
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