期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 25, 页码 6632-6638出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201800259
关键词
gels; iron; mechanical properties; noncovalent interactions; self-healing
资金
- Fundamental Research Funds for the Central Universities [2242017K41030]
Mechanically tough and electrically conductive self-healing hydrogels may have broad applications in wearable electronics, health-monitoring systems, and smart robotics in the following years. Herein, a new design strategy is proposed to synthesize a dual physical cross-linked polyethylene glycol/poly(acrylic acid) (PEG/PAA) double network hydrogel, consisting of ferric ion cross-linked linear chain extensions of PEG (2,6-pyridinedicarbonyl moieties incorporated into the PEG backbone, PEG-H(2)pdca) as the first physical network and a PAA-Fe3+ gel as the second physical network. Metal-ion coordination and the double network structure enable the double network hydrogel to withstand up to 0.4 MPa tensile stress and 1560% elongation at breakage; the healing efficiency reaches 96.8% in 12 h. In addition, due to dynamic ion transfer in the network, the resulting hydrogels exhibit controllable conductivity (0.0026-0.0061 S cm(-1)) and stretching sensitivity. These functional self-healing hydrogels have potential applications in electronic skin. It is envisioned that this strategy can also be employed to prepare other high-performance, multifunctional polymers.
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