Boron-containing poly(vinyl alcohol) as a ceramic precursor
| Autor: | Marco Antônio Schiavon, I. Valéria P. Yoshida, Pauline M. Barros |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Vinyl alcohol
Thermogravimetric analysis Analytical chemistry Condensed Matter Physics Electronic Optical and Magnetic Materials Thermogravimetry Boric acid chemistry.chemical_compound chemistry visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Fourier transform infrared spectroscopy Hybrid material Sol-gel Nuclear chemistry |
| Zdroj: | Journal of Non-Crystalline Solids. 352:3444-3450 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2006.02.108 |
| Popis: | In this paper, a preceramic precursor, prepared by condensation reaction from poly(vinyl alcohol) (PVA) and boric acid (B(OH)3) in a B–OH: PVA-OH molar ratio of 1:1, was synthesized, as a potential precursor of lower-temperature route for ceramic material. The polymer-to-ceramic conversion was studied by thermogravimetry (TG), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The kinetics parameters, such as the activation energy (AE) involved in the polymer-to-ceramic conversion, were investigated by dynamic thermogravimetric analysis. The AE value for each step was correlated to the molecular architecture and degree of crosslinking of the precursor. The FTIR spectrum of the precursor showed B–O, C–H and B–O–C stretching modes. The polymer underwent a thermal degradation in three-steps, yielding 17.1 wt% of ceramic char at 980 °C. The XRD study showed the formation of B2O3 crystalline phase dispersed in the graphitic carbon phase, as the final product. |
| Databáze: | OpenAIRE |
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