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Influence of filler/matrix interactions on resin/hardener stoichiometry, molecular dynamics, and particle dispersion of silicon nitride/epoxy nanocomposites

Influence of filler/matrix interactions on resin/hardener stoichiometry, molecular dynamics, and particle dispersion of silicon nitride/epoxy nanocomposites
Influence of filler/matrix interactions on resin/hardener stoichiometry, molecular dynamics, and particle dispersion of silicon nitride/epoxy nanocomposites
The addition of nanofillers can have a significant influence on the resin stoichiometry of thermosetting polymer systems. Based on differential scanning calorimetry (DSC) results, it is estimated that the inclusion of 2 wt% and 5 wt% of silicon nitride nanofiller displaces the resin/hardener stoichiometry of an epoxy/amine network by 6.5% and 18%, respectively. Dielectric spectroscopy results confirm the above findings, in that the spectra of the nanocomposite samples were found to be equivalent to the spectra of unfilled samples when the above stoichiometric effect was taken into account. Therefore, this study provides clear evidence that the presence of a nanofiller can directly and significantly affect the curing process of an epoxy network. Consequently, this should always be considered when introducing nanofillers into thermosetting matrices. These results indicate the presence of covalent bonding between the nanoparticles and the surrounding polymer and, therefore, provide an opportunity to explore the influence of this bonding on the molecular dynamics of the polymer layer around the particles. However, the obtained DSC and dielectric spectroscopy results suggest that, in the system considered here, either the covalent bonding does not have an appreciable influence on the segmental dynamics of the polymer, as revealed by these techniques, or that the thickness of the affected layer is less than 1 nm and therefore too small to be distinguished from experimental uncertainties.
0022-2461
Alhabill, Fuad, N. F.
253d8162-b329-46cc-ace6-5e39a8caca33
Ayoob, Raed
9520a234-f49a-45b9-ba23-c4d0e500da14
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Vaughan, Alun S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Alhabill, Fuad, N. F.
253d8162-b329-46cc-ace6-5e39a8caca33
Ayoob, Raed
9520a234-f49a-45b9-ba23-c4d0e500da14
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Vaughan, Alun S.
6d813b66-17f9-4864-9763-25a6d659d8a3

Alhabill, Fuad, N. F., Ayoob, Raed, Andritsch, Thomas and Vaughan, Alun S. (2017) Influence of filler/matrix interactions on resin/hardener stoichiometry, molecular dynamics, and particle dispersion of silicon nitride/epoxy nanocomposites. Journal of Materials Science. (doi:10.1007/s10853-017-1831-x).

Record type: Article

Abstract

The addition of nanofillers can have a significant influence on the resin stoichiometry of thermosetting polymer systems. Based on differential scanning calorimetry (DSC) results, it is estimated that the inclusion of 2 wt% and 5 wt% of silicon nitride nanofiller displaces the resin/hardener stoichiometry of an epoxy/amine network by 6.5% and 18%, respectively. Dielectric spectroscopy results confirm the above findings, in that the spectra of the nanocomposite samples were found to be equivalent to the spectra of unfilled samples when the above stoichiometric effect was taken into account. Therefore, this study provides clear evidence that the presence of a nanofiller can directly and significantly affect the curing process of an epoxy network. Consequently, this should always be considered when introducing nanofillers into thermosetting matrices. These results indicate the presence of covalent bonding between the nanoparticles and the surrounding polymer and, therefore, provide an opportunity to explore the influence of this bonding on the molecular dynamics of the polymer layer around the particles. However, the obtained DSC and dielectric spectroscopy results suggest that, in the system considered here, either the covalent bonding does not have an appreciable influence on the segmental dynamics of the polymer, as revealed by these techniques, or that the thickness of the affected layer is less than 1 nm and therefore too small to be distinguished from experimental uncertainties.

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JMSC-D-17-05433-FA - Accepted Manuscript
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10.1007%2Fs10853-017-1831-x - Version of Record
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Accepted/In Press date: 15 November 2017
e-pub ahead of print date: 20 November 2017

Identifiers

Local EPrints ID: 415661
URI: https://eprints.soton.ac.uk/id/eprint/415661
ISSN: 0022-2461
PURE UUID: ba3ec596-a292-43af-84f0-a44987a92958
ORCID for Thomas Andritsch: ORCID iD orcid.org/0000-0002-3462-022X
ORCID for Alun S. Vaughan: ORCID iD orcid.org/0000-0002-0535-513X

Catalogue record

Date deposited: 17 Nov 2017 17:30
Last modified: 09 May 2019 00:36

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