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

Binks, Fiona C., Cavalli, Gabriel, Henningsen, Michael, Howlin, Brendan and Hamerton, Ian (2019) On the use of benzaldehyde to improve the storage stability of one-pot, epoxy ionic liquid formulations EUROPEAN POLYMER JOURNAL, 112. pp. 126-136.

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Abstract

A series of adducts were prepared based on the reaction of 1-ethyl-3-methylimidazolium acetate and benzal- dehyde 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 experi- ments). 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 poly- merization. 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).

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Binks, Fiona C.
Cavalli, Gabriel
Henningsen, Michael
Howlin, BrendanB.Howlin@surrey.ac.uk
Hamerton, Ian
Date : March 2019
DOI : 10.1016/j.eurpolymj.2018.12.023
Copyright Disclaimer : © 2018 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Epoxy resins; Ionic liquids; Initiators; Latent cure
Additional Information : This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Depositing User : Diane Maxfield
Date Deposited : 25 Mar 2019 16:50
Last Modified : 19 Jun 2020 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/850858

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