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Open AccessArticle

Linear and Nonlinear Rheology Combined with Dielectric Spectroscopy of Hybrid Polymer Nanocomposites for Semiconductive Applications

1
Chalmers University of Technology, Department of Materials and Manufacturing Technology, SE-41296 Gothenburg, Sweden
2
Karlsruhe Institute of Technology (KIT), Institute for Polymer Technology and Polymer Chemistry, DE-76131 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Mikael S. Hedenqvist
Nanomaterials 2017, 7(2), 23; https://doi.org/10.3390/nano7020023
Received: 21 November 2016 / Revised: 16 January 2017 / Accepted: 17 January 2017 / Published: 24 January 2017
(This article belongs to the Special Issue Multifunctional Polymer-Based Nanocomposites)
The linear and nonlinear oscillatory shear, extensional and combined rheology-dielectric spectroscopy of hybrid polymer nanocomposites for semiconductive applications were investigated in this study. The main focus was the influence of processing conditions on percolated poly(ethylene-butyl acrylate) (EBA) nanocomposite hybrids containing graphite nanoplatelets (GnP) and carbon black (CB). The rheological response of the samples was interpreted in terms of dispersion properties, filler distortion from processing, filler percolation, as well as the filler orientation and distribution dynamics inside the matrix. Evidence of the influence of dispersion properties was found in linear viscoelastic dynamic frequency sweeps, while the percolation of the nanocomposites was detected in nonlinearities developed in dynamic strain sweeps. Using extensional rheology, hybrid samples with better dispersion properties lead to a more pronounced strain hardening behavior, while samples with a higher volume percentage of fillers caused a drastic reduction in strain hardening. The rheo-dielectric time-dependent response showed that in the case of nanocomposites containing only GnP, the orientation dynamics leads to non-conductive samples. However, in the case of hybrids, the orientation of the GnP could be offset by the dispersing of the CB to bridge the nanoplatelets. The results were interpreted in the framework of a dual PE-BA model, where the fillers would be concentrated mainly in the BA regions. Furthermore, better dispersed hybrids obtained using mixing screws at the expense of filler distortion via extrusion processing history were emphasized through the rheo-dielectric tests. View Full-Text
Keywords: polymer nanocomposites; graphite nanoplatelets; carbon black; electrical conductivity; shear rheology; extensional rheology polymer nanocomposites; graphite nanoplatelets; carbon black; electrical conductivity; shear rheology; extensional rheology
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MDPI and ACS Style

Kádár, R.; Abbasi, M.; Figuli, R.; Rigdahl, M.; Wilhelm, M. Linear and Nonlinear Rheology Combined with Dielectric Spectroscopy of Hybrid Polymer Nanocomposites for Semiconductive Applications. Nanomaterials 2017, 7, 23. https://doi.org/10.3390/nano7020023

AMA Style

Kádár R, Abbasi M, Figuli R, Rigdahl M, Wilhelm M. Linear and Nonlinear Rheology Combined with Dielectric Spectroscopy of Hybrid Polymer Nanocomposites for Semiconductive Applications. Nanomaterials. 2017; 7(2):23. https://doi.org/10.3390/nano7020023

Chicago/Turabian Style

Kádár, Roland; Abbasi, Mahdi; Figuli, Roxana; Rigdahl, Mikael; Wilhelm, Manfred. 2017. "Linear and Nonlinear Rheology Combined with Dielectric Spectroscopy of Hybrid Polymer Nanocomposites for Semiconductive Applications" Nanomaterials 7, no. 2: 23. https://doi.org/10.3390/nano7020023

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