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Investigation of the functional network modifier loading on the stoichiometric ratio of epoxy resins and their dielectric properties

Investigation of the functional network modifier loading on the stoichiometric ratio of epoxy resins and their dielectric properties
Investigation of the functional network modifier loading on the stoichiometric ratio of epoxy resins and their dielectric properties

Reactive molecular additives have often been employed to tailor the mechanical properties of epoxy resins. In addition, several studies have reported improved electrical properties in such systems, where the network architecture and included function groups have been modified through the use of so-called functional network modifier (FNM) molecules. The study reported here set out to investigate the effect of a glycidyl polyhedral oligomeric silsesquioxane (GPOSS) FNM on the cross-linking reactions, glass transition, breakdown strength and dielectric properties of an amine-cured epoxy resin system. Since many previous studies have considered POSS to act as an inorganic filler, a key aim was to consider the impact of GPOSS addition on the stoichiometry of curing. Fourier transform infrared spectroscopy revealed significant changes in the cross-linking reactions that occur if appropriate stoichiometric compensation is not made for the additional epoxide groups present on the GPOSS. These changes, in concert with the direct effect of the GPOSS itself, influence the glass transition temperature, dielectric breakdown behaviour and dielectric response of the system. Specifically, the work shows that the inclusion of GPOSS can result in beneficial changes in electrical properties, but that these gains are easily lost if consequential changes in the matrix polymer are not appropriately counteracted. Nevertheless, if the system is appropriately optimized, materials with pronounced improvements in technologically important characteristics can be designed.

Dielectric relaxation, Epoxy resin, Functional network modifiers, GPOSS, Glass transition temperature
0022-2461
12948-12964
Saeedi, Istebreq
6df4dfcf-9bb8-4edc-952e-ccc4841f7b54
Chaudhary, Sunny
25f0d213-03ef-4909-8cfc-29a8498aa28f
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Saeedi, Istebreq
6df4dfcf-9bb8-4edc-952e-ccc4841f7b54
Chaudhary, Sunny
25f0d213-03ef-4909-8cfc-29a8498aa28f
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3

Saeedi, Istebreq, Chaudhary, Sunny, Andritsch, Thomas and Vaughan, Alun (2021) Investigation of the functional network modifier loading on the stoichiometric ratio of epoxy resins and their dielectric properties. Journal of Materials Science, 56 (22), 12948-12964, [JMSC-D-20-10190]. (doi:10.1007/s10853-021-06113-8).

Record type: Article

Abstract

Reactive molecular additives have often been employed to tailor the mechanical properties of epoxy resins. In addition, several studies have reported improved electrical properties in such systems, where the network architecture and included function groups have been modified through the use of so-called functional network modifier (FNM) molecules. The study reported here set out to investigate the effect of a glycidyl polyhedral oligomeric silsesquioxane (GPOSS) FNM on the cross-linking reactions, glass transition, breakdown strength and dielectric properties of an amine-cured epoxy resin system. Since many previous studies have considered POSS to act as an inorganic filler, a key aim was to consider the impact of GPOSS addition on the stoichiometry of curing. Fourier transform infrared spectroscopy revealed significant changes in the cross-linking reactions that occur if appropriate stoichiometric compensation is not made for the additional epoxide groups present on the GPOSS. These changes, in concert with the direct effect of the GPOSS itself, influence the glass transition temperature, dielectric breakdown behaviour and dielectric response of the system. Specifically, the work shows that the inclusion of GPOSS can result in beneficial changes in electrical properties, but that these gains are easily lost if consequential changes in the matrix polymer are not appropriately counteracted. Nevertheless, if the system is appropriately optimized, materials with pronounced improvements in technologically important characteristics can be designed.

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Investigation of the Functional Network Modifier Loading on the Stoichiometric Ratio of Epoxy Resins and their Dielectric Properties - Accepted Manuscript
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More information

Accepted/In Press date: 16 April 2021
e-pub ahead of print date: 4 May 2021
Published date: August 2021
Keywords: Dielectric relaxation, Epoxy resin, Functional network modifiers, GPOSS, Glass transition temperature

Identifiers

Local EPrints ID: 449568
URI: http://eprints.soton.ac.uk/id/eprint/449568
ISSN: 0022-2461
PURE UUID: fbecd7a3-e34e-42fb-8d29-b20d2c7804a6
ORCID for Istebreq Saeedi: ORCID iD orcid.org/0000-0002-1254-748X
ORCID for Sunny Chaudhary: ORCID iD orcid.org/0000-0003-2664-7083
ORCID for Thomas Andritsch: ORCID iD orcid.org/0000-0002-3462-022X
ORCID for Alun Vaughan: ORCID iD orcid.org/0000-0002-0535-513X

Catalogue record

Date deposited: 08 Jun 2021 16:30
Last modified: 28 Mar 2024 03:06

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Contributors

Author: Istebreq Saeedi ORCID iD
Author: Sunny Chaudhary ORCID iD
Author: Thomas Andritsch ORCID iD
Author: Alun Vaughan ORCID iD

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