| 초록 |
Autonomous polymers that report damages prior to rupture and simultaneously self-heal are highly required for not only preventing catastrophic failures but also extending the lifetime use of the materials, thus ultimately keeping us on the path to sustainability. In this work, we demonstrate self-healable and re-processable thermosets that visualize damages in optical changes using spiropyrans (SPs) and thermo-reversible Diels-Alder (DA) chemistry. SP, a well-studied mechanochromic molecules, is used as an initiator for the Atom Transfer Radical Polymerization. With SP-linked linear polymers, a remoldable thermoset is accomplished by adding reversible cross-linkers that efficiently generate DA adducts. Mechanical activation of SPs in DA polymeric networks is investigated both by density functional theory calculations and mechanical testing. We also investigate self-healing and thermomechanical properties after multiple recycling process. |
