Achieving
both higher performance and faster recycling is the target
of developing self-healable and malleable epoxy resins. Herein, 1,4,5-oxadithiepane-2,7-dione
(DSAA) was synthesized to be the cocuring agent with methylhexahydrophthalic
anhydride for constructing new epoxy resins with dynamic and permanent
cross-linked network. Through adjusting the weight ratio of two curing
agents, the developed epoxy resin exhibits high mechanical and thermal
properties as well as excellent malleability and reversible self-healing
ability. For the resin (Ep3) containing 22.7 wt % of DSAA, its fracture
toughness reaches 1.25 ± 0.08 MPa m1/2. After heating
at 160 °C for 1 h, the self-healing efficiency of Ep3 is 96%
and glass transition temperature of remolded Ep3 is still as high
as 110 °C, and Ep3 is recycled completely after staying at 140
°C for only 0.5 h with the aid of catalytic amount of 4-dimethylaminopyridine
and triphenylphosphine. These outstanding integrated performances
demonstrate that Ep3 is beneficial for sustainable development.
A novel multi-functional polyacrylate coating simultaneously showing high tensile strength, good reversible self-healing efficiency and remarkable antibacterial ability has been developed.
Novel transparent and foldable polysiloxane films simultaneously showing superior mechanical properties, repeatable self-healing ability and high heat-resistance have been developed.
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