Highly Conductive Strong Healable Nanocomposites via Diels-Alder Reaction and Filler-Polymer Covalent Bifunctionalization
| Autor: | Yongjun Kim, Aby Paul Benny, Seunghyun Baik, K. P. Faseela |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Nanocomposite Materials science Maleic anhydride General Chemistry Polymer Furfuryl alcohol Biomaterials chemistry.chemical_compound chemistry Chemical engineering Covalent bond Percolation Ultimate tensile strength General Materials Science Biotechnology Diels–Alder reaction |
| Zdroj: | Small (Weinheim an der Bergstrasse, Germany). 18(3) |
| ISSN: | 1613-6829 |
| Popis: | Healable stretchable conductive nanocomposites have received considerable attention. However, there has been a trade-off between the filler-induced electrical conductivity (σ) and polymer-driven mechanical strength. Here significant enhancements in both σ and mechanical strength by designing reversible covalent bonding of the polymer matrix and filler-matrix covalent bifunctionalization are reported. A polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene grafted with maleic anhydride forms the strong reversible covalent bonding with furfuryl alcohol through the Diels-Alder reaction. Small (7.5 nm) and medium (117 nm) nanosatellite particles are generated by in situ etching of silver flakes, enabling electron tunneling-assisted percolation. The filler-polymer covalent bifunctionalization is achieved by 3-mercaptopropanoic acid. Altogether, this results in high σ (108 300 S m-1 ) and tensile strength (16.4 MPa), breaking the trade-off behavior. A nearly perfect (≈100%) healing efficiency is achieved in both σ and tensile strength. The conductive nanocomposite figure of merit (1.78 T Pa S m-1 ), defined by the product of σ and tensile strength, is orders of magnitude greater than the data in literature. The nanocomposite may find applications in healable strain sensors and electronic materials. |
| Databáze: | OpenAIRE |
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