Chemical Modification of Titanium Dioxide Employing Imidazols: Study of Superficial Properties

D. Juárez Picon, D. Contreras López, E. Pérez, J.A. González Calderón, C. Villegas Gómez, J. Vallejo Montesinos
Universidad de Guanajuato,

Keywords: titanium dioxide, imidazole, alkoxysilane


Titanium dioxide has been involved in the production of paints, coatings, adhesives, paper, plastics, and rubber, to name a few due to this vast amount of applications and the urge of being environmentally friendly in aqueous painting applications and other. This project aims to functionalize titanium dioxide using 1H-1-carboxylate of isopropyl-imidazole and 3-aminopropyltrimethoxysilane (APTMS) to improve its surface properties and its consequent dispersibility in aqueous media. The superficial and thermal properties are characterized by the zeta potential technique and differential scanning calorimetry showing that this process of synthesis of new materials, which is friendly to the environment and safe for its application. It provides exciting capabilities to the titanium dioxide particle. The confirmation of the presence of the organic structures coupled to titanium dioxide was obtained using the nuclear magnetic resonance technique for carbon, silicon, and proton of the sample above. We found that the zeta potential of the TiO2 particles was changed from one functionalization to another exhibiting good dispersion when the particle is silanized and agglomeration when the imidazole is attached to the organosilicon coating. DSC measurements showed that the imidazole attached to the organosilicon coating exhibited excellent thermal stability up to 300°C.