Thermal and electrical properties of starch-graphene oxide nanocomposites improved by photochemical treatment
Autor: | Mauro Francisco Pinheiro da Silva, Sanclayton G. C. Moreira, Priscilla P. Peregrino, Luiz Fernando Lobato Da Silva, Maria A. G. Soler, Leonardo G. Paterno, Maria J. A. Sales |
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Rok vydání: | 2014 |
Předmět: |
Thermogravimetric analysis
Vinyl alcohol Materials science Hot Temperature Polymers and Plastics Scanning electron microscope Ultraviolet Rays Oxide Thermal diffusivity Photochemistry Spectrum Analysis Raman law.invention Nanocomposites chemistry.chemical_compound symbols.namesake law Spectroscopy Fourier Transform Infrared Materials Chemistry Electric Impedance Nanocomposite Graphene Organic Chemistry Acetylation Hydrogen Bonding Starch Photochemical Processes chemistry Polyvinyl Alcohol Thermogravimetry symbols Microscopy Electron Scanning Graphite Raman spectroscopy Hydrophobic and Hydrophilic Interactions |
Zdroj: | Carbohydrate polymers. 106 |
ISSN: | 1879-1344 |
Popis: | Bionanocomposite films have been prepared by casting an aqueous suspension of acetylated starch (ST) and poly(vinyl alcohol) (PVA) loaded with graphene oxide (GO). A photochemical and reagentless method has been successfully performed to convert the GO phase into reduced graphene oxide (RGO). The nanocomposites have displayed improved thermal and electrical properties when the amount of the GO phase is increased and properly converted to RGO. The molecular-level interactions between components are mainly hydrogen-bonding type according to attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and Raman spectroscopies, as well as thermogravimetric analysis (TGA). Scanning electron microscopy (SEM) has confirmed the effective mixing between the GO and the ST-PVA matrix. The thermal diffusivity and electrical resistivity of ST-GO nanocomposites have increased one order and decreased two orders of magnitude, respectively, after the photochemical treatment. These findings have confirmed the effectiveness of the proposed approach to produce starch-based nanocomposites with improved thermal and electrical properties. |
Databáze: | OpenAIRE |
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