PVDF/TiO 2 nanocomposites prepared by solution blow spinning: Surface properties and their relation with S. Mutans adhesion

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Abstract

Thermoplastic nanocomposite materials with potential bactericide properties were prepared and their surface properties and adhesion to Streptococcus mutans, S. mutans, were characterized. Solution blow spinning was successfully used to prepare films with a fiber-like structure on the surface of nanocomposites based on Polyvinylidene fluoride, PVDF, filled with well dispersed TiO 2 nanoparticles. PVDF/TiO 2 nanocomposites were prepared varying the nanoparticles content (0%, 1%, 2%, 5% and 10% by weight). In order to understand the influence of the presence of TiO 2 nanoparticles and the final surface properties on the adhesion of S. mutans to the materials, a deep characterization was carried out focusing on the morphology, roughness, surface free energy from contact angle measurements and cell adhesion by single cell force spectroscopy. It was observed that the uniform dispersion of the nanofiller arose from nanoparticles embedded in the polymer when fibers were created during the blow spinning process. TiO 2 content influenced the topography of the films probably due to a direct effect on the solvent evaporation rate. Although this factor greatly conditioned the roughness of the samples and therefore the surface free energy, S. mutant adhesion on the substrates under study was concluded to be more dependent on the specific interactions with the surface polar groups of the material.

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González-Benito, J., Teno, J., González-Gaitano, G., Xu, S., & Chiang, M. Y. (2017). PVDF/TiO 2 nanocomposites prepared by solution blow spinning: Surface properties and their relation with S. Mutans adhesion. Polymer Testing, 58, 21–30. https://doi.org/10.1016/j.polymertesting.2016.12.005

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