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Organic–Inorganic Coatings Based on Epoxidised Castor Oil/APTES/TEOS

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Journal of the American Oil Chemists' Society

Abstract

Two series of organic–inorganic hybrid films were prepared from epoxidised castor oil (ECO) and the inorganic precursor 3-aminopropyltriethoxysilane (APTES), and the combination of APTES with tetraethoxysilane (TEOS) with different organic to inorganic proportions. Films were pre-cured at room temperature under inert atmosphere and subsequently submitted to thermal curing. The macro- and microscopic properties of the films, including adhesion, hardness, microstructure and thermal properties, were determined as a function of the proportion of ECO to inorganic precursors. Morphologic studies showed that the hybrid films were microscopically homogeneous. The hardness and tensile strength of the films increased with increased concentrations of inorganic precursor. All of the films exhibited good adhesion to an aluminium surface and worked as an efficient barrier against corrosion.

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Acknowledgments

The authors thank CNPq and CNPq-RHAE for the financial support and fellowship to D.M.B, Dr. Jane Zoppas Ferreira, Laboratório de Corrosão, Proteção e Reciclagem de Materiais (LACOR), for the corrosion test (salt spray test) and Dr. Marly M. Jacobi for the mechanical analysis.

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Authors and Affiliations

  1. Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Porto Alegre, RS, 91501-970, Brazil

    Denize Maria Becchi, Maria Augusta de Luca & Márcia Martinelli

  2. Bioplus Desenvolvimento Biotecnológico Ltda., Centro de Biotecnologia, UFRGS, Avenida Bento Gonçalves 9500, Porto Alegre, RS, 91501-970, Brazil

    Sydnei Mitidieri

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  1. Denize Maria Becchi
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  2. Maria Augusta de Luca
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  3. Márcia Martinelli
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  4. Sydnei Mitidieri
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Correspondence to Márcia Martinelli.

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Becchi, D.M., de Luca, M.A., Martinelli, M. et al. Organic–Inorganic Coatings Based on Epoxidised Castor Oil/APTES/TEOS. J Am Oil Chem Soc 88, 101–109 (2011). https://doi.org/10.1007/s11746-010-1651-5

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  • DOI: https://doi.org/10.1007/s11746-010-1651-5

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