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    Polydimethylsiloxane/silica/titania composites prepared by solvent-free sol–gel technique

    Year: 2010

    Journal: Journal of sol-gel science and technology, Volume 56, Number 3, 310-319, 20111221

    Authors: 1Mihaela Alexandru, 1Maria Cazacu, 1Alexandra Nistor, 1Valentina E. Musteata, 1Iuliana Stoica, 1Cristian Grigoras, 2Bogdan C. Simionescu

    Organizations: 1‘‘Petru Poni’’ Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, Iasi 700487, Romania, 2Department of Natural and Synthetic Polymers, ‘‘Gh. Asachi’’ Technical University of Iasi, Iasi 700050, Romania

    Composites based on polydimethylsiloxane incorporating silica and titania were prepared by mixing polydimethylsiloxane with proper oxides precursors, tetraethyl-orthosilicate and tetrabutyl-orthotitanate. In the presence of environmental humidity and in acid catalysis, hydrolysis/condensation processes take place with formation of oxides and concomitantly polymer crosslinking. Partial replacement of SiO2 in a polydimethylsiloxane/silica composite with titania (both generated in situ by sol–gel process) affects surface hydrophilicity (evaluated by dynamic contact angle), water vapor sorption ability (determined by dynamic vapor sorption) and thermal stability. The dielectric properties are also controlled by composition.