Study of Structural, Thermic, µ-Raman and Optic Transformation of PVA/TiO2 Polymeric Membranes
- Autores: Juan David Romero Salazar
- Localización: Scientia et Technica, ISSN 0122-1701, Vol. 23, Nº. 4, 2018, págs. 542-551
- Idioma: inglés
- Enlaces
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Resumen
Composites (1-x)PVA/xTiO2 (0,025≤x≤0,250) were prepared from aqueous solution. The influence of TiO2 ceramic fillers on polymer matrix was characterized by: X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA), micro-Raman scattering, UV-visible absorption (UV-vis) and scanning electronic microscopy (SEM). Raman and XRD results showed the amorphous and monoclinic phases for PVA and anatase phase for TiO2. SEM micrographs showed spread TiO2 fillers in PVA polymeric matrix forming aggregates. DSC and TGA thermograms show phase transitions with temperature, glass transition temperature (Tg) and thermal stability of polymeric matrix. The band gap energy (Eg) related to TiO2 (anatase) has been calculated from UV-visible measures, showing a strong absorption at near-UV region due to ceramic fillers.
