Filmogen organic-inorganic hybrids obtained by sol-gel in the presence of cationic polymer

Dan Donescu, Sever Serban, V.I. Uricanu, Michael H.G. Duits, Alain Perichaud, Mihaela Olteanu, Manuela Spiroiu, Marilena Vasilescu

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Abstract

Self-standing and coated-on-glass films were prepared from polymer-inorganic ormosils, using the cationic polymer poly(methacrylamide propyl quaternarydimethyldodecyl bromide). The inorganic compound was grown in sol-gel reactions based on methyltriethoxysilane (MeTES), with or without addition of the titanium-precursor: tetraisopropyl orthotitanate. As evidenced by thermogravimetric analysis and differential scanning calorimetry data, the thermal properties of the films are highly dependent on the internal morphology. Inorganic granules with a TiO2 rich shell have a more polar surface, which stimulates stronger electrostatic interactions with the polymer, hence, a reduced mobility for the amino end and a smaller probability to have amino ends engaged in interactions at the surface of the granules. Coated-on-glass films drawn from pure cationic polymer suffer from partial dewetting. Topographic and force-versus-distance recordings using atomic force microscopy showed a change in the energy balance and no dewetting regions were encountered for polymer/MeTES based composites. However, because of nongrafted polymer, these films are not immune at washing with water/ acetone. Explorations of antibacterial activity against the gram-negative bacteria, Pseudomonas aeruginosa, were done using ormosil films with alkoxysilanes combinations.
Original languageUndefined
Pages (from-to)2625-2633
Number of pages9
JournalJournal of applied polymer science
Volume106
Issue number4
DOIs
Publication statusPublished - 2007

Keywords

  • Atomic force microscopy (AFM)
  • Morphology
  • Micro-structure
  • IR-72218
  • inorganic materials
  • METIS-241009
  • Thermal properties

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