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

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Silva, Robson R. [UNESP]
Salvi, Denise T. B. [UNESP]
Santos, Moliria V. [UNESP]
Barud, Hernane S.
Marques, Lippy F.
Santagneli, Silvia H. [UNESP]
Tercjak, Agnieszka
Ribeiro, Sidney J. L. [UNESP]
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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.
Organic-inorganic hybrids, Cellulose acetate, 3-Glycidoxypropyltrimethoxysilane, Europium, Photoluminescence
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Journal Of Sol-gel Science And Technology. Dordrecht: Springer, v. 81, n. 1, p. 114-126, 2017.