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Effect of concentrations of plasticizers on the sol-gel properties developed from alkoxides precursors

  • Sandra Raquel Kunst,
  • Marielen Longhi,
  • Lilian Vanessa Rossa Beltrami,
  • Lucas Pandolphi Zini,
  • Rosiana Boniatti,
  • Henrique Ribeiro Piaggio Cardoso,
  • Maria Rita Ortega Vega,
  • Célia de Fraga Malfatti

DOI
https://doi.org/10.1590/0104-1428.12916
Journal volume & issue
Vol. 27, no. 4
pp. 346 – 352

Abstract

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Abstract Coatings developed through sol-gel method is presented as an interesting replacement to chromium coating. Sol-gel method present advantages as high purity and excellent distribution of the components. The objective of this work is to synthesize and characterize a film obtained by sol-gel route. The film was prepared with 3-(trimethoxysilylpropyl) methacrylate (TMSPMA), tetraethoxysilane (TEOS) and cerium nitrate, using water and ethanol as solvents. Polyethyleneglycol (PEG) plasticizer was added at four different concentrations. The sol was characterized by techniques of viscosity, thermogravimetric analysis (TGA), X-ray diffraction (XRD) nuclear magnetic resonance spectroscopy (NMR) and Fourier transform infrared spectroscopy (FT-IR). The results showed that tetrafunctional alkoxides condensation was retarded by the plasticizer, forming a compact film. The film with 20 g.L-1 of PEG showed the best electrochemical behavior.

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