Mechanically robust but dynamic elastomers as functional coatings based on dynamic covalent bonds and multiple noncovalent interactions

Abstract

Much attention has been paid to the fabrication of advanced materials to solve the global plastic pollution crisis. This study developed a sustainable coating material, Poly(TA-DES-Cu), a thioctic acid-based covalent adaptable network (CAN). The synergistic noncovalent interactions of Cu²⁺–carboxyl coordination and DES-involved hydrogen bonding in Poly(TA-DES-Cu) endow the elastomer with good mechanical properties (1808% fracture strain and 7.92 MJ m⁻³ toughness), self-healing capability (25–60 °C, >80% stress recovery after 10 cycles), interfacial adhesion (2.52 MPa on steel) and recyclability. In particular, the cooperative dynamic noncovalent interactions and molecular chain slippage enable efficient energy dissipation and puncture resistance (11.42 mJ), leading to its further application as a coating material. After coating on nonwoven fabrics, it not only enhances the mechanical performance but also leads to broad-spectrum antibacterial activity of the resulting composite material. This strategy provides a novel approach for designing sustainable intelligent polymer materials.