On the use of benzaldehyde to improve the storage stability of one-pot, epoxy ionic liquid formulations

Fiona C. Binks, Gabriel Cavalli, Michael Henningsen, Brendan J. Howlin, Ian Hamerton*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

2 Citations (Scopus)
10 Downloads (Pure)

Abstract

A series of adducts were prepared based on the reaction of 1-ethyl-3-methylimidazolium acetate and benzaldehyde in various stoichiometries (from equimolar reaction to benzaldehyde in 10-fold excess) and the resulting adducts were characterized using nuclear magnetic resonance spectroscopy (1H, 13C, DEPT, and HQSC experiments). Differential scanning calorimetry was used to examine the initiating behaviour of the adducts towards mono- and di-functional epoxy resins and the data were used to determine kinetic parameters for the polymerization. The lower temperature peak, due to carbene formation, is sensitive to adduct concentration; the residual ionic liquid in the adduct mixture contributes towards the initiation of the curing reaction. When a monofunctional epoxy and the 1:1 adduct was subjected to a 2-week period of storage at room temperature and sub-zero temperatures in the freezer, the profiles of the thermograms for the frozen samples do not change considerably over the storage period and the formulation retains a light yellow colour (rather than the viscous, dark red appearance of the formulation stored at room temperature).

Original languageEnglish
Pages (from-to)126-136
Number of pages11
JournalEuropean Polymer Journal
Volume112
Early online date18 Dec 2018
DOIs
Publication statusPublished - Mar 2019

Structured keywords

  • Bristol Composites Institute ACCIS

Keywords

  • Epoxy resins
  • Initiators
  • Ionic liquids
  • Latent cure

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