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Examining the nature of network formation during epoxy polymerisation initiated with ionic liquids

Binks, Fiona C., Cavalli, Gabriel, Henningsen, Michael, Howlin, Brendan J. and Hamerton, Ian (2018) Examining the nature of network formation during epoxy polymerisation initiated with ionic liquids Polymer, 150. pp. 318-325.

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Abstract

A commercial diglycidyl ether of bisphenol A monomer (Baxxores™ ER 2200, eew 182 g/mole, DGEBA) is thermally polymerized in the presence of an ionic liquid, 1-ethyl-3-methylimidazolium acetate at a variety of loadings (5–45 wt %). The loss modulus data for cured samples, containing 5 wt % initiator, display at least two thermal transitions and the highest storage modulus occurs in the sample that has been cured for the shortest time at the lowest temperature. Samples that are exposed to higher temperatures (140, 150 °C) yield more heterogenous networks, whereas following exposure to a much shorter/lower temperature cure schedule (80 °C) exhibits a considerably higher damping ability than the other samples, coupled with a lower glass transition temperature. Differential scanning calorimetry reveals that the latter sample achieves a conversion of 95%, while crosslink densities for the DGEBA samples containing 5 wt % and 15 wt % are respectively 9.5 × 10-3 mol. dm-3 and 1.2 × 10-3 mol. dm-3 (when cured to 80 °C) and 2.0 × 10-2 mol. dm-3 and 2.4 × 10-3 mol. dm-3 (when cured to 140 °C).

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Binks, Fiona C.
Cavalli, GabrielG.Cavalli@surrey.ac.uk
Henningsen, Michael
Howlin, Brendan J.B.Howlin@surrey.ac.uk
Hamerton, IanI.Hamerton@surrey.ac.uk
Date : 17 July 2018
DOI : 10.1016/j.polymer.2018.07.046
Copyright Disclaimer : © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Epoxy resins; Ionic liquids; Initiators; Network formation; Physico-mechanical properties
Depositing User : Clive Harris
Date Deposited : 25 Jul 2018 09:54
Last Modified : 18 Jul 2019 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/848777

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