Soutenance de thèse : Ting SHI

Introduction of Ionic Liquid via Microencapsulation to Design Enhanced and Self-healable Epoxy-Amine Composites

Doctorante : Ting SHI

Laboratoire INSA : IMP

Ecole doctorale : ED534 : Matériaux de Lyon

Epoxy resin as one of the most widely used thermoset material is facing the problem of high brittleness and low toughness, which has limited their application in some specific occasions. Therefore, to improve the toughness to prevent crack propagation and to heal the initial microcracks in the epoxy matrix could prolong the life time of epoxy composites. Ionic liquid (IL) has been applied to design higher performance epoxy composition because of their excellent intrinsic properties with an abundant combination of cations and anions. Therefore, this work focus on improvement of toughness and self- healing property in traditional epoxy-amine composites via a popular methodology —— microencapsulation. In the first section, phosphonium type ionic liquid was firstly encapsulated in silica shell as microcapsules to improve the toughness of epoxy-amine network and toughness mechanism was also discussed. In the second section, epoxy monomer was encapsulated in poly(urea-formaldehyde) shell as extrinsic healing agent and ionic liquid was incorporated in epoxy-amine network, which aimed at achieving self- healing in high temperature cured epoxy composites. In the last section, ionic liquid epoxy monomer was synthesized and it was firstly encapsuled in poly(melamine- formaldehyde) microcapsules and they were added in different epoxy-amine matrix to design single microcapsule self-healing system. Therefore, this work focused on different properties through different combinations of ionic liquids and microcapsules in epoxy composites, which has broadened the application scope of ionic liquid and will inspire for the follow-up study.