Prolonged in situ self-healing in structural composites via thermo-reversible entanglement
Abstract
Natural processes continuously degrade a material’s performance throughout its life cycle. An emerging class of synthetic self-healing polymers and composites possess property-retaining functions with the promise of longer lifetimes. But sustained in-service repair of structural fiber-reinforced composites remains unfulfilled due to material heterogeneity and thermodynamic barriers in commonly cross-linked polymer-matrix constituents. Overcoming these inherent challenges for mechanical self-recovery is vital to extend in-service operation and attain widespread adoption of such bioinspired structural materials. Here we transcend existing obstacles and report a fiber-composite capable of minute-scale and prolonged in situ healing — 100 cycles: an order of magnitude higher than prior studies. By 3D printing a mendable thermoplastic onto woven glass/carbon fiber reinforcement and co-laminating with electrically resistive heater interlayers, we achieve in situ thermal remending of internal delamination via dynamic bond re-association. Full fracture recovery occurs below the glass-transition temperature of the thermoset epoxy-matrix composite, thus preserving stiffness during and after repair. A discovery of chemically driven improvement in thermal remending of glass- over carbon-fiber composites is also revealed. The marked lifetime extension offered by this self-healing strategy mitigates costly maintenance, facilitates repair of difficult-to-access structures (e.g., wind-turbine blades), and reduces part replacement, thereby benefiting economy and environment.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 31, 2022
- Source ID
- 10.1038/s41467-022-33936-z
Entities
People
- Alexander D. Snyder
- Charles E Diesendruck
- Jack S. Turicek
- Jason F Patrick
- Kalyana B. Nakshatrala
- Zachary J. Phillips
Organizations
- Air Force Office of Scientific Research
- Engineer Research and Development Center
- National Science Foundation