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Dynamic mechanical response in epoxy nanocomposites incorporating various nano-silica architectures

Dynamic mechanical response in epoxy nanocomposites incorporating various nano-silica architectures
Dynamic mechanical response in epoxy nanocomposites incorporating various nano-silica architectures
This paper is a continuation of the previous work where the dielectric response (BDS) of epoxy nanocomposites filled with three types of nano-silica architectures, namely core (SiO 2 ), core-shell (SiO 2 )-(SiO 2 ) and hollow (h-SiO 2 ). was investigated. These samples were filled based on their respective nanoparticle surface area, keeping it theoretically constant across all samples. The aim is to better understand the molecular dynamics and physical mechanisms in dielectric nanocomposites to contribute towards developing materials with tailored properties. The samples were characterised based on their dynamic mechanical behaviour (DMA) and their T g was measured by DSC. Unlike BDS, there is no additional relaxation peak observed in DMA thermographs besides the conventionally known α and β. The T g of the samples increases as the size of the nanoparticles decreases. Analysis of the height, width and intensity of the tan δ of α relaxation peak suggests reduction in the localised modes of motion as the size of the nanoparticles reveals a internally plasticised nanocomposite system. The T g values obtained from DSC do not vary significantly across the samples. These key findings are discussed in details and demonstrate by providing further evidence that the additional relaxation observed in BDS measurements is potentially due to the presence of hydrogen bond interactions between the polymer matrix and the fillers. However, no significant impact on the viscoelastic-mechanical properties of the nanocomposites is evident.
IEEE
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
Feuchter, Michael
79470acb-c440-4731-83ca-6a742bad17fa
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
Feuchter, Michael
79470acb-c440-4731-83ca-6a742bad17fa

Chaudhary, Sunny, Vryonis, Orestis, Vaughan, Alun, Andritsch, Thomas and Feuchter, Michael (2022) Dynamic mechanical response in epoxy nanocomposites incorporating various nano-silica architectures. In Proceedings of the 2022 IEEE 4th International Conference on Dielectrics (ICD). IEEE. 4 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper is a continuation of the previous work where the dielectric response (BDS) of epoxy nanocomposites filled with three types of nano-silica architectures, namely core (SiO 2 ), core-shell (SiO 2 )-(SiO 2 ) and hollow (h-SiO 2 ). was investigated. These samples were filled based on their respective nanoparticle surface area, keeping it theoretically constant across all samples. The aim is to better understand the molecular dynamics and physical mechanisms in dielectric nanocomposites to contribute towards developing materials with tailored properties. The samples were characterised based on their dynamic mechanical behaviour (DMA) and their T g was measured by DSC. Unlike BDS, there is no additional relaxation peak observed in DMA thermographs besides the conventionally known α and β. The T g of the samples increases as the size of the nanoparticles decreases. Analysis of the height, width and intensity of the tan δ of α relaxation peak suggests reduction in the localised modes of motion as the size of the nanoparticles reveals a internally plasticised nanocomposite system. The T g values obtained from DSC do not vary significantly across the samples. These key findings are discussed in details and demonstrate by providing further evidence that the additional relaxation observed in BDS measurements is potentially due to the presence of hydrogen bond interactions between the polymer matrix and the fillers. However, no significant impact on the viscoelastic-mechanical properties of the nanocomposites is evident.

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Submitted date: 17 April 2022
Accepted/In Press date: 29 May 2022
e-pub ahead of print date: 7 July 2022
Venue - Dates: IEEE 2022 International Conference on Dielectrics, Palermo, Italy, Palermo, Italy, 2022-07-03 - 2022-07-07

Identifiers

Local EPrints ID: 467416
URI: http://eprints.soton.ac.uk/id/eprint/467416
PURE UUID: be8d60a6-b2a2-40ff-a9a6-2972875c664e
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: 07 Jul 2022 17:49
Last modified: 14 Dec 2024 03:09

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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
Author: Michael Feuchter

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