Spectroscopic evidence of successful in situ insertion of sol–gel silica in a poly(3-hydroxybutyrate) matrix
| Autor: | Maxwell de Paula Cavalcante, José Carlos Dutra Filho, Elton Jorge da Rocha Rodrigues, Anna Lecticia Martinez Martinez Toledo, Maria Inês Bruno Tavares |
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| Rok vydání: | 2020 |
| Předmět: |
In situ
chemistry.chemical_classification Materials science Nanocomposite Small-angle X-ray scattering Poly-3-hydroxybutyrate 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Matrix (chemical analysis) chemistry Ceramics and Composites Particle Composite material 0210 nano-technology Nuclear chemistry Sol-gel |
| Zdroj: | Journal of Thermoplastic Composite Materials. 35:1408-1421 |
| ISSN: | 1530-7980 0892-7057 |
| DOI: | 10.1177/0892705720935939 |
| Popis: | Silica-based (SiO2) poly(3-hydroxybutyrate) (PHB) nanocomposites were obtained via an in situ sol–gel route in three distinct particle concentrations (1, 5, and 7.5% by weight of PHB). The polymer hybrids formed were analyzed via wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), Fourier transform infrared (FTIR) spectroscopy, and time-domain nuclear magnetic resonance relaxometry (TD-NMR). The SiO2 inorganic structure displayed surface fractal features at low concentration (1 wt%) and denser agglomerates at higher concentrations (5 and 7.5 wt%). FTIR and SAXS results confirmed the formation of the inorganic matrix amid the polymer chains with different levels of distribution and organization. WAXD and TD-NMR results suggested the SiO2 influence on the PHB crystallinity degree, which was reflected on the polymer’s molecular dynamics with a nonlinear dependence of particles concentration in the PHB matrix. |
| Databáze: | OpenAIRE |
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