Polydimethylsiloxane/silica/titania composites prepared by solvent-free sol–gel technique |
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| Authors: | Mihaela Alexandru Maria Cazacu Alexandra Nistor Valentina E Musteata Iuliana Stoica Cristian Grigoras Bogdan C Simionescu |
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| Institution: | (1) “Petru Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, Iasi, 700487, Romania;(2) Department of Natural and Synthetic Polymers, “Gh. Asachi” Technical University of Iasi, Iasi, 700050, Romania |
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| Abstract: | 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. |
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