Self-Healing Polymer Materials and Their Properties

Self-healing polymer materials are a class of advanced polymers capable of autonomously repairing damage through dynamic bonds or embedded healing agents. They are broadly divided into intrinsic systems, which employ reversible covalent or supramolecular interactions to drive repair, and extrinsic systems, which rely on microcapsules or vascular networks to deliver healing agents upon damage. Intrinsic approaches harness dynamic covalent chemistries—such as disulfide metathesis, reversible cycloadditions and imine exchange—and supramolecular interactions including hydrogen bonding, metal–ligand coordination and π–π stacking. These dynamic networks confer the ability to restore mechanical integrity, with key performance metrics encompassing healing efficiency, tensile strength, toughness and the repeatability of repair cycles. Emerging architectures such as covalent adaptable networks and vitrimers exhibit glass-like flow under heat while preserving network connectivity, thereby enabling reshaping, recycling and extended lifetime. Applications span protective coatings, flexible electronics, biomedical devices and sustainable composites, addressing global challenges in maintenance costs, resource consumption and waste reduction. Current efforts focus on integrating renewable feedstocks, multi-stimuli responsiveness and scalable manufacturing to advance circular-economy solutions and next-generation adaptive materials.

Research from Nature Portfolio

Recent studies have demonstrated supramolecular elastomers and thermoplastic elastomer systems that combine high mechanical performance with rapid autonomous healing. One report described a polydimethylsiloxane-based supramolecular elastomer incorporating synergistic hydrogen bonds and disulfide exchange, achieving stretchability beyond 10 000% and healing efficiencies above 80% under diverse conditions, including subzero temperatures, underwater immersion and strong acid or alkali. Another work detailed an amorphous carbonate-type thermoplastic polyurethane with a mechano-responsive hydrogen-bond array that orders under strain to toughen the material and disorders upon relaxation to enable self-repair at mild temperatures. These examples underscore the balance of bond strength and dynamics required to achieve durable, repeatable healing without compromising mechanical integrity.

Self-Healing Polymer Materials and Their Properties publication trend

The graph below shows the total number of articles in self-healing polymer materials and their properties across all publications each year (not limited to Nature Index journals).

Technical terms

Dynamic covalent bond: A reversible covalent linkage that can break and reform under specific stimuli, enabling network rearrangement and self-repair.

Supramolecular interaction: A non-covalent attraction such as hydrogen bonding, metal–ligand coordination or π–π stacking that dynamically associates and dissociates to heal damage.

Covalent Adaptable Network (CAN): A polymer network endowed with dynamic covalent bonds allowing the material to be reshaped, repaired or recycled while maintaining crosslinked integrity.

Diels–Alder reaction: A reversible cycloaddition between a diene and a dienophile, often used to introduce thermally switchable crosslinks in self-healing polymers.

Disulfide metathesis: An exchange reaction between disulfide bonds that facilitates autonomous healing through bond reconfiguration.

References

1. Self-healing by Diels-Alder cycloaddition in advanced functional polymers: A review. Progress in Materials Science (2023).
2. Intrinsic Self-Healing Chemistry for Next-Generation Flexible Energy Storage Devices. Nano-Micro Letters (2023).
3. Biobased and aromatic Covalent Adaptable Networks: When architectures meet properties, within the framework of a circular bioeconomy. Materials Science and Engineering R Reports (2024).
4. Vitrimers: permanent organic networks with glass-like fluidity. Chemical Science (2016).
5. Universally autonomous self-healing elastomer with high stretchability. Nature Communications (2020).
6. Mechano-responsive hydrogen-bonding array of thermoplastic polyurethane elastomer captures both strength and self-healing. Nature Communications (2021).