Degradable bio-based epoxy vitrimers based on imine chemistry and their application in recyclable carbon fiber composites

Self-healable fiber-reinforced vitrimer composites: overview and future prospects

“… 93 In a similar study, two different imine exchange based vitrimers were synthesized using vanillin/1,6-hexylenediamine (VHP) and vanillin/ m -xylylenediamine (VMP) curing agents. 94 The tan δ result shows that the T g of VHP and VMP bio-based imine epoxy vitrimers are 83 °C and 96 °C, respectively, whereas the storage modulus values are 2600 MPa and 2650 MPa, respectively. This could be attributed to the higher rigidity chain structure for VMP vitrimer ( Fig.…”

Designed from Biobased Materials for Recycling: Imine‐Based Covalent Adaptable Networks

“…1, 6-hexanediamine [49] ; 4-aminophenol [50] ; Methylcyclohexanediamine [51] For the thermoset: T g ≈ 83-96°C (from DMTA), [49] For the thermoset: T g ≈ 70°C (from DMTA) [50] ; For the thermoset: T g ≈ 131°C (from DMTA) [51] For the thermoset: 𝜎 ≈ 73-78 MPa, ɛ ≈…”

“…[40] Commercial epoxy resins with vanillin-based hardeners, exhibiting Schiff base bonds, have also been employed for the realization of composites reinforced with carbon fibers. [49] The composite resins, differing from each other by the employed diamine (m-xylylenediamine and 1,6-hexanediamine), were used for the fabrication of cured CF/VMP and CF/VHP thermoset composites, respectively. The results of the characterizations are schematized in Figure 5b.…”

Progress in the design and synthesis of biobased epoxy covalent adaptable networks

“…The second group is associative CANs, which are also called vitrimers by Leibler et al 23 The breaking and reforming of DCBs occur simultaneously in vitrimers. In the last two decades, many types of exchangeable reactions have been explored and used to develop epoxy CANs, including the Diels-Alder (DA) reaction, 24,25 disulfide exchange, [26][27][28][29] Schiff base (imine) exchange, [30][31][32] boronic ester exchange, 33,34 siloxane equilibration 35,36 and acetal exchange. 37 These reactions provide a new range of opportunities for the sustainable development of epoxy thermosets.…”