| Autor: |
Snyder, Alexander D., Phillips, Zachary J., Turicek, Jack S., Diesendruck, Charles E., Nakshatrala, Kalyana B., Patrick, Jason F. |
| Předmět: |
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| Zdroj: |
Nature Communications; 10/31/2022, Vol. 13 Issue 1, p1-12, 12p |
| Abstrakt: |
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. Synthetic materials that can repeatedly self-repair, akin to biological systems, are vital to meeting the 21st century's infrastructural demands. Here, authors develop fiber-reinforced composites with rapid and prolonged in situ self-healing while also preserving structural integrity. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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