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| Azevedo, Nuno Monteiro |
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Hameed, Nishar
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Publications (10/10 displayed)
- 2024Intelligent process monitoring of smart polymer composites using large area graphene coated fabric sensor
- 2024Expanded Polystyrene/Tyre Crumbs Composites as Promising Aggregates in Mortar and Concretecitations
- 2023Intrinsically modified self-extinguishing fire-retardant epoxy resin using boron-polyol complexcitations
- 2022Recent progress and multifunctional applications of fire-retardant epoxy resinscitations
- 2022Strain monitoring in reduced graphene oxide‐coated glass fiber/epoxy compositecitations
- 2021Distribution states of graphene in polymer nanocomposites : A reviewcitations
- 2021Graphene as a piezo-resistive coating to enable strain monitoring in glass fiber compositescitations
- 2020Evolving Strategies for Producing Multiscale Graphene‐Enhanced Fiber‐Reinforced Polymer Composites for Smart Structural Applicationscitations
- 2020Rapid cross-linking of epoxy thermosets induced by solvate ionic liquids
- 2020Core-Shell Nanofibers of Polyvinylidene Fluoride-based Nanocomposites as Piezoelectric Nanogeneratorscitations
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article
Rapid cross-linking of epoxy thermosets induced by solvate ionic liquids
Abstract
The high-volume manufacture of fiber-reinforced composites faces a huge challenge because long resin curing times put a low ceiling on the total output of parts produced per year. To translate the benefits from using epoxy in large-volume production platforms, cure cycle times of less than 1 min must be achieved. In this work, we report solvate ionic liquids (SILs) as simple and efficient rapid curing catalytic additives in epoxy systems. Ultrafast curing was observed at low levels of 1-5% of SIL in epoxy resin, and the cure rate is enhanced up to 26-fold without compromising the mechanical and thermal properties. Further investigations revealed that enhancement in the cure rate is dependent on the type of SILs employed, influenced by the metal center, the ligands around the metal, and the identity of the counter anion. The relative Lewis acidity of each of the active complexes was calculated, and the rapid cure effect was attributed to the activation of the epoxide moietyviathe Lewis acidic nature of the SIL. Making epoxy thermosets rapidly processable enables enormous benefits, finding applications in a whole variety of transformation methods that exist for traditional glass and metals. Copyright © 2020 American Chemical Society