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Introduction of ionic liquid via microencapsulation to design enhanced and self-healable epoxy-amine composites

Abstract : Epoxy networks are the most widely used thermoset materials. Nevertheless, these highly crosslinked networks display a high brittleness, i.e. a low toughness, which limits their applications in some specific occasions. Therefore, improving the toughness to prevent crack propagation and healing damages which could occur in the epoxy matrices for low strains is a key issue to extent life span of epoxy-based materials such as fiber-based thermoset composites materials. Ionic liquids (IL) have been considered to design high performance epoxies because of the excellent intrinsic properties and a very large number of combinations of cations and anions. Therefore, this works focus on improvement of toughness and self-healing property in conventional epoxy-amine networks via a microencapsulation-based strategy. In the first section, phosphonium type ionic liquid was firstly encapsulated in silica shell-based microcapsules which could contribute to the improvement of the toughness of epoxy-amine network. In the second section, an epoxy monomer was encapsulated in poly(urea-formaldehyde) shell-based microcapsule as an extrinsic healing agent and an ionic liquid was incorporated in epoxy-amine-IL network. Self-healing was expected to be achieved at high temperature by the releasing of the epoxy from the breakage of microcapsules and its polymerization induced by the IL. In the last section, a ionic liquid functionalized epoxy monomer was synthesized. This one was first encapsuled in poly(melamine-formaldehyde) shell microcapsules and that were added into different epoxy-amine matrices to design single microcapsule-based self-healing systems. Therefore, this work focused on different strategies via different combinations of ionic liquids and microcapsules designed for epoxy networks. Numerous research routes and technological applications will be offered based on our results.
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Submitted on : Wednesday, June 29, 2022 - 6:35:48 PM
Last modification on : Tuesday, September 27, 2022 - 4:18:34 AM

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  • HAL Id : tel-03709308, version 1

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Ting Shi. Introduction of ionic liquid via microencapsulation to design enhanced and self-healable epoxy-amine composites. Materials. Université de Lyon, 2022. English. ⟨NNT : 2022LYSEI026⟩. ⟨tel-03709308⟩

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