Multifunctional organic-inorganic hybrids based on cellulose acetate and 3-glycidoxypropyltrimethoxysilane

Autor(es)

Silva, Robson R. ; Salvi, Denise T. B. ; Santos, Moliria V. ; Barud, Hernane S. ; Marques, Lippy F. ; Santagneli, Silvia H. ; Tercjak, Agnieszka ; Ribeiro, Sidney J. L.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Sol-Gel Science and Technology; v. 81, n. 1, p. 13-pg., 2017-01-01.

Resumo

Organic-inorganic hybrid films have been prepared from cellulose acetate (CA) and 3-glycidoxypropyltrimethoxysilane (GPTMS). Flexible films were fashioned with high relative content of GPTMS (up to 70 wt%) and exhibited high transparency in the visible/near-infrared region. The atomic force microscopy images of hybrid films display the presence of nanometric globular-like domains with size dependent and number dependent of the content of GPTMS. X-ray diffraction (XRD) patterns showed decreasing crystallinity of CA hybrid counterpart with increasing amounts of GPTMS. Spectroscopy results (vibrational spectroscopy FTIR and Raman scattering, C-13 and Si-29 NMR spectra) suggest that epoxy groups mostly remain intact and significant amount of methoxysilane groups is available after addition of GPTMS in CA. From Si-29 NMR results, all compositions showed the presence of non-hydrolized GPTMS molecules or having mono-and disubstituted siloxane bonds. For highest relative content of GPTMS (i.e., 50 wt%), a considerably high amount of non-hydrolized (T-0) is observed. Moreover, the addition of GPTMS leads to an increase in the thermal stability as compared to pure CA. Luminescent films were obtained by incorporating luminescent [Eu(TTA)(3)(H2O)(2)] complex (TTA = thenoyltrifluoroacetonate) into the hybrid films. Spectroscopic parameters did not significantly change with the incorporation of luminescent complex, suggesting application in photonics. The D-5(0) states quantum efficiency was observed to be the same for the neat complex and the luminescent hybrid film, suggesting a weak interaction with the host. (AU)

• Processo FAPESP: 14/12424-2 - Propriedades ópticas de suspensões coloidais e filmes à base de nanoceluloses e lantanídeos
• Beneficiário: Moliria Vieira dos Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/24692-1 - Materiais híbridos multifuncionais a base de celulose bacteriana
• Beneficiário: Sidney José Lima Ribeiro
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
• Processo FAPESP: 13/12367-6 - Nanoestruturas unidimensionais de Te como template para preparação de nanofios e nanotubos multifuncionais contendo íons lantanídeos
• Beneficiário: Robson Rosa da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado