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
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
15 February 2022
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)
Dielectric response in epoxy nanocomposites incorporating various nano-silica architectures.
In 2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP).
vol. 2021-December,
IEEE.
.
(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.
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More information
Accepted/In Press date: 12 December 2021
Published date: 15 February 2022
Additional Information:
Funding Information:
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).
Keywords:
Core-Shell Nanoparticle, Epoxy, Molecular Dynamics
Identifiers
Local EPrints ID: 453315
URI: http://eprints.soton.ac.uk/id/eprint/453315
ISSN: 0084-9162
PURE UUID: c83fa04d-7b1b-4869-806d-564be134c500
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Date deposited: 12 Jan 2022 17:41
Last modified: 24 Apr 2024 02:07
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Contributors
Author:
Sunny Chaudhary
Author:
Orestis Vryonis
Author:
Alun Vaughan
Author:
Thomas Andritsch
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