Biomass derived epoxy systems: From reactivity to final properties

Abstract : The present work focuses on the conception of bio-based epoxy resins arising from an increasing interest class of curing agents: the dicarboxylic acid. The hardener used was first synthesized from maleic anhydride and dipropylene glycol and then copolymerized with epoxidized linseed oil (ELO) to design resins from bio-resources. The anionic copolymerization between the two monomers has been highlighted by DSC while evolutions of chemical structures have been investigated by the corroboration of FT-IR and 2D NMR spectroscopies. DMA and DSC studies indicate that the copolymerization reaction is influenced by epoxy/dicarboxylic acid ratio and the presence of an initiator. Interestingly, the utilization of imidazole derivative as initiator provides selective reactions, which significantly increase the crosslink density and the α-relaxation temperature (Tα) of obtained networks. The resulting materials exhibit ductile and flexible behaviour with low Tα although keeping excellent thermal resistance (T10% > 315 °C).
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Guillaume Falco, Nicolas Sbirrazzuoli, Alice Mija. Biomass derived epoxy systems: From reactivity to final properties. Materials Today Communications, Elsevier, 2019, 21, pp.100683. ⟨10.1016/j.mtcomm.2019.100683⟩. ⟨hal-02355707⟩



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