Supertough spontaneously self-healing polymer based on septuple dynamic bonds integrated in one chemical group

Abstract

The development of spontaneously self-healing materials with excellent mechanical properties remains a formidable challenge despite the extensive interest in such materials. This is because the self-healing and mechanical properties of a material are usually optimized via contradictory routes. The present study demonstrated a supertough spontaneously self-healing polymer, Fe-(2,6-diacetylpyridine dioxime)-urethane-based polyurethane (Fe-PPOU) based on septuple dynamic bonds integrated in one chemical group. A synergistic effect was induced by the presence of multiple dynamic crosslinking points, which comprised the integrated dynamic interactions, and the hidden lengths of the folded polymeric chains in Fe-PPOU. Thus, the mechanical and self-healing properties of the polymer were simultaneously optimized. Fe-PPOU demonstrated the highest reported toughness (139.8 MJ m−3 ) among all the room-temperature spontaneously self-healing polymers with a nearly 100% healing rate. Fe-PPOU exhibited instant (30 s) self-healing to reach a strength of 1.6 MPa that was higher than the original strength of numerous recently reported self-healing polymers.

Mechanoluminescent Device: In Situ Renewable Carbazole Derivatives Sandwiched by Self-Healing Disulfide-Containing Polyurethane for Mechanical Signals Detection

“…29 The thermomechanical behavior of SPU films was further investigated by dynamic mechanical analysis (Figure S3); SPU-I to SPU-IV show a similar T g , demonstrating that the samples are elastomers at room temperature. 36 A series of polyurethane elastomers (SPU-I to SPU-IV) with variable mechanical properties were prepared by regulating the proportion of soft segment PTMG 2000 and cross-linking agent TMP. The stress−strain curves (Figure 3c) clearly illustrate that the strain of SPUs increases while the stress gradually declines, as the polytetramethylene glycol structural units increase and the cross-linking points in SPUs covalent cross-linking networks decrease.…”

Synthesis of TiO2 nanogel composite for highly efficient self-healing epoxy coating

“…Self-healing coatings showed the potential to ameliorate this crucial problem of organic coatings by repairing the coating through various approaches [13] , [14] . Currently, new approaches for self-healing have been utilized including the healing agent's release, reversible bonding, and nanoparticles [15] , [16] , [17] , [18] . Among the various approaches, the fabrication of metal oxide NCs has presented a great improvement in corrosion resistance and self-healing performance with the possibility for repeated self-healings [19] .…”

Water-Enhanced and Remote Self-Healing Elastomers in Various Harsh Environments

“…Diselenide bond, − a water-stable visible-light-responsive dynamic covalent bond, is introduced into the material as the main driving force for healing. The hydrophobic backbone poly­(dimethylsiloxane) (PDMS) was utilized to maintain a low swelling ratio in water, and the abundant hydrogen bonds (HBs) between the neighboring urea bonds served as an auxiliary driving force for healing, − and at the same time as a noncovalent cross-linker to endow the material with good ductility and elasticity. The diselenide-containing polyurea elastomers (PDMS-IU-SeSe) with remote underwater healing capabilities can instantly seal pipelines in water and have great potential in emergency healing in urgent and inaccessible cases.…”