The University of Southampton
University of Southampton Institutional Repository

Dielectric response in epoxy nanocomposites incorporating various nano-silica architectures

Dielectric response in epoxy nanocomposites incorporating various nano-silica architectures
Dielectric response in epoxy nanocomposites incorporating various nano-silica architectures

The molecular dynamics and physical mechanisms in dielectric nanocomposites are key to develop materials with tailored properties. The effect of the architecture of nanoparticles on the bulk properties is one such factor which needs to be studied and understood. The aim of this study is to investigate the effect of different core-shell structures on the bulk properties of the epoxy nanocomposites. TEM images confirm the successful synthesis of the core-shell and hollow nanoparticles. Epoxy nanocomposites filled with three types of nano-silica architectures, namely core (SiO2), core-shell (SiO2-SiO2) and hollow (h-SiO2) were prepared. They were characterised via broadband dielectric spectroscopy as a function of frequency in the range of 10-1-105 Hz and a temperature range of -160°C - 160°C. Besides well known relaxations, an additional so called SiOH relaxation is observed. Its intensity is proportional to the amorphous content of the nanoparticles. A distinct overlap between the epoxy β relaxation and SiOH relaxation is also observed, significantly affecting the intensity of the β relaxation. Finally, due to the presence of additional core-shell interface in case of SiO2-SiO2 filled nanocomposite two interfacial polarization peaks are observed. These preliminary findings illustrate noticeable effect of the architecture (additional interfacial polarization peak) and crystallinity (SiOH relaxation) of the nanoparticles on the dielectric behaviour of the nanocomposite.

Core-Shell Nanoparticle, Epoxy, Molecular Dynamics
57-60
IEEE
Chaudhary, Sunny
e9feb00c-4cc9-4935-ad3f-2ee457d0207e
Vryonis, Orestis
4affde05-88f2-436f-b036-dceedf31ea9c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Chaudhary, Sunny
e9feb00c-4cc9-4935-ad3f-2ee457d0207e
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) Dielectric response in epoxy nanocomposites incorporating various nano-silica architectures. In 2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE. pp. 57-60 . (doi:10.1109/CEIDP50766.2021.9705316).

Record type: Conference or Workshop Item (Paper)

Abstract

The molecular dynamics and physical mechanisms in dielectric nanocomposites are key to develop materials with tailored properties. The effect of the architecture of nanoparticles on the bulk properties is one such factor which needs to be studied and understood. The aim of this study is to investigate the effect of different core-shell structures on the bulk properties of the epoxy nanocomposites. TEM images confirm the successful synthesis of the core-shell and hollow nanoparticles. Epoxy nanocomposites filled with three types of nano-silica architectures, namely core (SiO2), core-shell (SiO2-SiO2) and hollow (h-SiO2) were prepared. They were characterised via broadband dielectric spectroscopy as a function of frequency in the range of 10-1-105 Hz and a temperature range of -160°C - 160°C. Besides well known relaxations, an additional so called SiOH relaxation is observed. Its intensity is proportional to the amorphous content of the nanoparticles. A distinct overlap between the epoxy β relaxation and SiOH relaxation is also observed, significantly affecting the intensity of the β relaxation. Finally, due to the presence of additional core-shell interface in case of SiO2-SiO2 filled nanocomposite two interfacial polarization peaks are observed. These preliminary findings illustrate noticeable effect of the architecture (additional interfacial polarization peak) and crystallinity (SiOH relaxation) of the nanoparticles on the dielectric behaviour of the nanocomposite.

Text
Dielectric Response in Epoxy Nanocomposites Incorporating Various Nano-silica Architectures
Restricted to Repository staff only
Request a copy

More information

Accepted/In Press date: 12 December 2021
Published date: 15 February 2022
Additional Information: Funding Information: ACKNOWLEDGEMENT The research work was performed within the K-Project ’PolyTherm’ at the Polymer Competence Centre Leoben GmbH (PCCL, Austria) within the framework of the COMET-program of the Federal Ministry for Transport, Innovation and Technology and the Federal Ministry for Digital and Economic Affairs with contributions by scientific partners and company partners. Funding is provided by the Austrian Government and the State Government of Styria (Österreichische Forschungsförderungsgesellschaft - Grant Number: 862835). Publisher Copyright: © 2021 IEEE.
Keywords: Core-Shell Nanoparticle, Epoxy, Molecular Dynamics

Identifiers

Local EPrints ID: 453315
URI: http://eprints.soton.ac.uk/id/eprint/453315
PURE UUID: c83fa04d-7b1b-4869-806d-564be134c500
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

Catalogue record

Date deposited: 12 Jan 2022 17:41
Last modified: 11 Jan 2023 02:56

Export record

Altmetrics

Contributors

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

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×