Structure-Property Behavior of Organic-Inorganic Hybrid Materials Based on Sol Gel Chemistry

The design and synthesis of protective anti-corrosive organic-inorganic hybrid coatings is a promising option to reduce the weathering of some metallic substrates like cupper or iron. In this work an organic-inorganic hybrid film has been synthetized, which contains tannins (Ta), poly(styrene) (Pst) and silicium dioxide (SiO2). This film was obtained by a sequence of three steps: 1) Incorporation of tannins to the poly(styrene) matrix (Ta-Pst), 2) Then by using the sol-gel technique in an acid medium the SiO2 solution were incorporated to Ta-Pst, 3) Finally in a non-polar medium, hybrid films were obtained. The hybrids films obtained by this method were analyzed by SEM, AFM, FTIR and DRX. The results obtained in this study show an increase in roughness and hardness of the film as the amount of SiO2 is gradually increased. In addition the characterization by DRX allowed us to determine the structural changes of the SiO2 particles in the film as the Pst content was increased.