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Effect of surfactant molecular structure on the electrical and thermal performance of epoxy/functionalized‐graphene nanocomposites

Effect of surfactant molecular structure on the electrical and thermal performance of epoxy/functionalized‐graphene nanocomposites
Effect of surfactant molecular structure on the electrical and thermal performance of epoxy/functionalized‐graphene nanocomposites
In this study, three different moieties containing amino‐groups were incorporated into graphene oxide (GO) in order to modify interfacial interactions within an epoxy matrix. The GO was functionalized with two bifunctional molecules of different molar masses (d230 and d4000) and a trifunctional (t440). The resulting functionalized GO (fGO) systems were characterized by Raman spectroscopy, thermogravimetric analysis (TGA) and X‐ray photoelectron spectroscopy (XPS), which demonstrated the presence of the functionalizer groups. Analysis of nanocomposites including the above three fGOs by microscopy and differential scanning calorimetry (DSC) demonstrated that the presence of the functionalizer moieties served to improve the platelet distribution within the matrix and to affect the local fGO/matrix interfacial interactions perturbing the epoxy curing reactions; we suggest that these changes stem from the fGO surface structure and the introduction of additional reactive amine nitrogen. X‐ray diffraction revealed reduced graphitic stacking with increased functionalizer molar mass. The electrical conductivity of the fGO‐filled epoxy was enhanced with increasing functionalizer molecular weight, an effect we relate to the influence of this on platelet stacking. The thermal conductivity was, however, adversely affected by all reagents at low fGO contents.
amines, electrical conductivity, epoxy, functionalization, graphene, percolation threshold, thermal conductivity
0272-8397
2753-2767
Vryonis, Orestis
4affde05-88f2-436f-b036-dceedf31ea9c
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Vryonis, Orestis
4affde05-88f2-436f-b036-dceedf31ea9c
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e

Vryonis, Orestis, Andritsch, Thomas, Vaughan, Alun and Lewin, Paul (2020) Effect of surfactant molecular structure on the electrical and thermal performance of epoxy/functionalized‐graphene nanocomposites. Polymer Composites, 41 (7), 2753-2767.

Record type: Article

Abstract

In this study, three different moieties containing amino‐groups were incorporated into graphene oxide (GO) in order to modify interfacial interactions within an epoxy matrix. The GO was functionalized with two bifunctional molecules of different molar masses (d230 and d4000) and a trifunctional (t440). The resulting functionalized GO (fGO) systems were characterized by Raman spectroscopy, thermogravimetric analysis (TGA) and X‐ray photoelectron spectroscopy (XPS), which demonstrated the presence of the functionalizer groups. Analysis of nanocomposites including the above three fGOs by microscopy and differential scanning calorimetry (DSC) demonstrated that the presence of the functionalizer moieties served to improve the platelet distribution within the matrix and to affect the local fGO/matrix interfacial interactions perturbing the epoxy curing reactions; we suggest that these changes stem from the fGO surface structure and the introduction of additional reactive amine nitrogen. X‐ray diffraction revealed reduced graphitic stacking with increased functionalizer molar mass. The electrical conductivity of the fGO‐filled epoxy was enhanced with increasing functionalizer molecular weight, an effect we relate to the influence of this on platelet stacking. The thermal conductivity was, however, adversely affected by all reagents at low fGO contents.

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More information

Accepted/In Press date: 9 March 2020
e-pub ahead of print date: 19 March 2020
Related URLs:
Keywords: amines, electrical conductivity, epoxy, functionalization, graphene, percolation threshold, thermal conductivity

Identifiers

Local EPrints ID: 439730
URI: http://eprints.soton.ac.uk/id/eprint/439730
ISSN: 0272-8397
PURE UUID: a43c0b09-e80b-49ac-94ac-43add133bfb3
ORCID for Thomas Andritsch: ORCID iD orcid.org/0000-0002-3462-022X
ORCID for Alun Vaughan: ORCID iD orcid.org/0000-0002-0535-513X
ORCID for Paul Lewin: ORCID iD orcid.org/0000-0002-3299-2556

Catalogue record

Date deposited: 30 Apr 2020 16:34
Last modified: 03 Dec 2021 02:35

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Contributors

Author: Orestis Vryonis
Author: Thomas Andritsch ORCID iD
Author: Alun Vaughan ORCID iD
Author: Paul Lewin ORCID iD

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