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Dielectric properties of modified graphene oxide filled polyurethane nanocomposites and its correlation with rheology
Abstract
This study aims at investigating the dynamic mechanical, dielectric and rheological properties of reinforced polyurethane (PU) nanocomposites containing hydrophilic graphene oxide (GO) and/or hydrophobic modified graphene oxide (mGO) sheets. The organic modification of GO was performed with 4,4′-methylenebis (phenyl isocyanate) (MDI) and the samples were prepared by solvent mixing. We found that addition of mGO provides a more significant increase in the dielectric permittivity as compared to the addition of GO. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) spectroscopy demonstrate the more effective dispersion of thin exfoliated sheets of mGO in the PU matrix as compared to unmodified GO. This qualitative morphology observation is correlated with the quantitative results inferred from the dynamic mechanical analysis, rheology and dielectric studies. The viscoelastic Payne effect is noticed for all nanocomposites and the filler–filler and polymer–filler interactions are studied by applying the Kraus and Maier and Goritz models. The non-linear viscoelastic behavior of the PU nanocomposites is in good agreement with the Maier and Goritz model, which includes the effects of the adsorption/desorption of PU chains on the filler surface. The observed results underline the possibilities of PU composites with organically modified GO sheets in capacitor applications.
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Authors (8)
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Kishor Sadasivuni dr
- Univ Bretagne Sud, F-56100 Lorient, France LIMATB Lab
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Deepalekshmi Ponnamma dr
- Mahatma Gandhi Univ, Kottayam 686560, Kerala, India Sch Chem Sci
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Bijandra Kumar
- Univ Illinois, Chicago, IL 60607 USA Dept Mech & Ind Engn
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Ruth Cardinaels
- Katholieke Univ Leuven, Rheol & Technol Grp, BE-3001 Leuven, Belgium Dept Chem Engn
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Paula Moldenaers
- Katholieke Univ Leuven, Rheol & Technol Grp, BE-3001 Leuven, Belgium Dept Chem Engn
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Thomas Sabu
- Mahatma Gandhi Univ, Kottayam 686560, Kerala, India Sch Chem Sci
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Yves Grohens
- Univ Bretagne Sud, Rue St Maude, F-56100 Lorient, France LIMATB Lab
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Keywords
Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
COMPOSITES SCIENCE AND TECHNOLOGY
no. 104,
pages 18 - 25,
ISSN: 0266-3538 - Language:
- English
- Publication year:
- 2014
- Bibliographic description:
- Sadasivuni, K., Ponnamma, D., Kumar, B., Strankowski M., Cardinaels, R., Moldenaers, P., Sabu T., Grohens, Y.: Dielectric properties of modified graphene oxide filled polyurethane nanocomposites and its correlation with rheology// COMPOSITES SCIENCE AND TECHNOLOGY. -Vol. 104, nr. 19 (2014), s.18-25
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.compscitech.2014.08.025
- Verified by:
- Gdańsk University of Technology
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