Cross-linked,High-strength and Resilient Recyclable Epoxy Resin Constructed by Click Chemistry Using Triazolindione-Indole
A series of indole side-chain epoxy polymers(EIx)were synthesized by accurately proportioning 5-methoxytryptamine,N,N-dimethyl-1,6-hexanediamine,and E51-type epoxy resin.Cross-linked,high-strength and resilient recyclable epoxy resin(EIx-TAD)was constructed using click chemistry by mixing flexible triazolinedione with the polymer side-chain indole groups in a 2∶1 molar ratio.Among the cross-linked modified films,EI10-TAD demonstrates exceptional mechanical performance,evidenced by a tensile strength of 50.7 MPa,an elongation at break of 225.4％,and a fracture energy of 80.1 MJ·m-3.As the crosslinking degree increases,EI25-TAD exhibits a tensile strength of 69.5 MPa,an elongation at break of 6.1％,and a fracture energy of 2.8 MJ·m-3.Thermal analysis reveals the thermoreversibility of the triazolinedione-indole(TAD-indole)click reaction.EI25-TAD film displays efficient reprocessing capability within 10 minutes under the condition of 30 MPa and 120℃.The high-performance recyclable epoxy resins(EIx-TAD)constructed by click chemistry demonstrate excellent mechanical properties,thermoreversibility,and efficient recyclability.
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维普
