Self‐Healing Polymers via Supramolecular, Hydrogen‐Bonded Networks

Self‐healing polymeric materials towards non‐structural recovery of functional properties

“…This composite has an organic supramolecular polymer (made from dimer acid, triamine and urea) as host and nickel microparticles with nanostructured morphology as filler. The supramolecular polymeric network with a glass transition temperature lower than room temperature provides multiple self‐healing functions via the large number of weak hydrogen bonds, while the nickel particles provide conductivity to the composite. On rupture, the initial conductivity is repeatedly restored with ca 90% efficiency after 15 s healing time.…”

Healing of Polymeric Solids by Supramolecular Means

“…Consequently, moieties that combine multiple hydrogen bonds in a directional manner such as the strongly dimerizing quadrupole hydrogen bonding 2-ureido-4[1H]-pyrimidinone (UPy) and sextuple hydrogen bonding Hamilton wedge-barbiturate pair are employed. [1,2,5,21] Nonetheless, the vast majority of healable materials based on hydrogen-bonding interactions are thermoplastic elastomers, with relatively low strength and stiffness, also because the binding motifs are usually combined with low-glass-transition-temperature telechelics. [9] With the goal to access more rigid healable polymers, the preparation of healable supramolecular polymer glasses was recently reported.…”

Self-Healing Polymeric Composite Material Design, Failure Analysis and Future Outlook: A Review

“…The theory of supramolecular self-healing materials is dependent on the use of noncovalent, transient bonds to generate networks, which are capable to heal the damaged location, putting the aspect of reversibility and dynamics of a network and its fundamental supramolecular bonds in the spotlight for the understanding and design of self-healing polymers via this concept of self-healing. Furthermore, supramolecular interactions can affect material properties such as the polymers’ strength (moduli), its viscosity and flow, as well as the intrinsic organization of polymer chains [ 84 , 93 , 94 , 95 , 96 ]. Perhaps the two most studied interactions so far are those found in ionomers for ballistic [ 82 , 97 ] and coating applications and hydrogen bonding represented by the well-defined ureidopyrimidinone constituent and the use of randomly branched oligomers equipped with self-complementary and complementary hydrogen bonding groups [ 82 ].…”