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Stoichiometry and molecular dynamics of anhydride-cured epoxy resin incorporating octa-glycidyl POSS Co-Monomer

Stoichiometry and molecular dynamics of anhydride-cured epoxy resin incorporating octa-glycidyl POSS Co-Monomer
Stoichiometry and molecular dynamics of anhydride-cured epoxy resin incorporating octa-glycidyl POSS Co-Monomer

The influence of octa-glycidyl (OG) cubic silsesquioxane and reaction stoichiometry (stoichiometry factor, SF) on the cure chemistry and molecular dynamics of an anhydride-cured epoxy resin is reported. Fourier transform infrared spectroscopy revealed that an excess of epoxide groups suppresses esterification, as does the substitution of the epoxy pre-polymer with OG. Suppressed glass transition temperature (T g) is reported for any given SF on addition of OG; these results are supported by the dielectric α relaxation behaviour. System-to-system network variations arising from changes in the degree of esterification and etherification are not sufficient to form discrete dielectric β processes. Finally, we propose a generic interpretation for the γ dielectric relaxation involving both competing origins reported in the literature, namely γ 1 (local motions of main-chain segments) and γ 2 (unreacted moieties). These attributions explain the observed dielectric features and relate these to the chemical composition of each system.

Anhydride, Epoxy stoichiometry, Molecular dynamics, OG POSS
0032-3861
Vryonis, Orestis
4affde05-88f2-436f-b036-dceedf31ea9c
Riarh, Satpreet
079407c8-7920-4d99-acb4-05ed8d8b03a6
Andritsch, Thomas
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Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Vryonis, Orestis
4affde05-88f2-436f-b036-dceedf31ea9c
Riarh, Satpreet
079407c8-7920-4d99-acb4-05ed8d8b03a6
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3

Vryonis, Orestis, Riarh, Satpreet, Andritsch, Thomas and Vaughan, Alun (2021) Stoichiometry and molecular dynamics of anhydride-cured epoxy resin incorporating octa-glycidyl POSS Co-Monomer. Polymer, 213, [123312]. (doi:10.1016/j.polymer.2020.123312).

Record type: Article

Abstract

The influence of octa-glycidyl (OG) cubic silsesquioxane and reaction stoichiometry (stoichiometry factor, SF) on the cure chemistry and molecular dynamics of an anhydride-cured epoxy resin is reported. Fourier transform infrared spectroscopy revealed that an excess of epoxide groups suppresses esterification, as does the substitution of the epoxy pre-polymer with OG. Suppressed glass transition temperature (T g) is reported for any given SF on addition of OG; these results are supported by the dielectric α relaxation behaviour. System-to-system network variations arising from changes in the degree of esterification and etherification are not sufficient to form discrete dielectric β processes. Finally, we propose a generic interpretation for the γ dielectric relaxation involving both competing origins reported in the literature, namely γ 1 (local motions of main-chain segments) and γ 2 (unreacted moieties). These attributions explain the observed dielectric features and relate these to the chemical composition of each system.

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Polymer_1210_OV_Accepted - Accepted Manuscript
Restricted to Repository staff only until 11 December 2021.
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Accepted/In Press date: 10 December 2020
e-pub ahead of print date: 11 December 2020
Published date: 20 January 2021
Keywords: Anhydride, Epoxy stoichiometry, Molecular dynamics, OG POSS

Identifiers

Local EPrints ID: 446570
URI: http://eprints.soton.ac.uk/id/eprint/446570
ISSN: 0032-3861
PURE UUID: ecaf1ddb-5d25-488a-86a8-080ab6a3b0bb
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: 15 Feb 2021 17:31
Last modified: 18 Feb 2021 17:22

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Contributors

Author: Orestis Vryonis
Author: Satpreet Riarh
Author: Thomas Andritsch ORCID iD
Author: Alun Vaughan ORCID iD

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