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Molecular dynamics of epoxy nanocomposites filled with core–shell and hollow nanosilica architectures

Molecular dynamics of epoxy nanocomposites filled with core–shell and hollow nanosilica architectures
Molecular dynamics of epoxy nanocomposites filled with core–shell and hollow nanosilica architectures
Here we contrast the molecular dynamics of epoxy nanocomposites filled with three different types of silica-based nanoparticles with different architectures, namely solid core, core–shell and hollow and with varying degree of crystallinity. The samples are characterised by Fourier transform infrared spectroscopy, differential scanning calorimetry, broadband dielectric spectroscopy and dynamic mechanical analysis (DMA). Widely known relaxations such as α, β, γ, normal mode and interfacial polarisation are observed and discussed. An additional relaxation named omega (ω) is also observed, whose dielectric strength is inversely correlated to the crystallinity of the nanoparticles. We suggest that this may be attributed to the polarizing interaction of the hydroxyl groups of silanols with the hydroxy ether groups of the polymer chain. The ω is absent in DMA confirming it as a polarisation phenomenon. At lower concentration of silanols, the ω largely overlaps with β, effectively becoming an integral part of it. Finally, two interfacial polarisation relaxations are observed in the case of core–shell structures, originating from the core–shell and shell–polymer interface but, due to the similar real permittivity values of the core, shell and the polymer, their dielectric strength is weak.
Dielectric Spectroscopy, Core-Shell Nanoparticle, Hollow Nanoparticle, Omega Relaxation, Molecular Relaxation
0022-2461
21020–21038
Chaudhary, Sunny
25f0d213-03ef-4909-8cfc-29a8498aa28f
Vryonis, Orestis
4affde05-88f2-436f-b036-dceedf31ea9c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Chaudhary, Sunny
25f0d213-03ef-4909-8cfc-29a8498aa28f
Vryonis, Orestis
4affde05-88f2-436f-b036-dceedf31ea9c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c

Chaudhary, Sunny, Vryonis, Orestis, Vaughan, Alun and Andritsch, Thomas (2022) Molecular dynamics of epoxy nanocomposites filled with core–shell and hollow nanosilica architectures. Journal of Materials Science, 57, 21020–21038. (doi:10.1007/s10853-022-07938-7).

Record type: Article

Abstract

Here we contrast the molecular dynamics of epoxy nanocomposites filled with three different types of silica-based nanoparticles with different architectures, namely solid core, core–shell and hollow and with varying degree of crystallinity. The samples are characterised by Fourier transform infrared spectroscopy, differential scanning calorimetry, broadband dielectric spectroscopy and dynamic mechanical analysis (DMA). Widely known relaxations such as α, β, γ, normal mode and interfacial polarisation are observed and discussed. An additional relaxation named omega (ω) is also observed, whose dielectric strength is inversely correlated to the crystallinity of the nanoparticles. We suggest that this may be attributed to the polarizing interaction of the hydroxyl groups of silanols with the hydroxy ether groups of the polymer chain. The ω is absent in DMA confirming it as a polarisation phenomenon. At lower concentration of silanols, the ω largely overlaps with β, effectively becoming an integral part of it. Finally, two interfacial polarisation relaxations are observed in the case of core–shell structures, originating from the core–shell and shell–polymer interface but, due to the similar real permittivity values of the core, shell and the polymer, their dielectric strength is weak.

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Accepted/In Press date: 4 November 2022
e-pub ahead of print date: 22 November 2022
Published date: 1 December 2022
Keywords: Dielectric Spectroscopy, Core-Shell Nanoparticle, Hollow Nanoparticle, Omega Relaxation, Molecular Relaxation

Identifiers

Local EPrints ID: 476360
URI: http://eprints.soton.ac.uk/id/eprint/476360
ISSN: 0022-2461
PURE UUID: 3669a92e-f409-40ab-96b9-0de73fa70f8c
ORCID for Sunny Chaudhary: ORCID iD orcid.org/0000-0003-2664-7083
ORCID for Orestis Vryonis: ORCID iD orcid.org/0000-0002-2862-4494
ORCID for Alun Vaughan: ORCID iD orcid.org/0000-0002-0535-513X
ORCID for Thomas Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

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Date deposited: 19 Apr 2023 16:46
Last modified: 28 Mar 2024 03:06

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Contributors

Author: Sunny Chaudhary ORCID iD
Author: Orestis Vryonis ORCID iD
Author: Alun Vaughan ORCID iD
Author: Thomas Andritsch ORCID iD

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