soft hydrogel materials can be applied to biosensors, wearable electronics, artificial skins, soft robots, etc. Practical applications require materials to have a variety of properties, such as high conductivity, toughness, self-healing, and stretchability. However, it is still challenging to achieve all these features in a single material. Recently, Northwest Normal University scientific research team described the use of a simple method to prepare a new composite carboxymethyl cellulose/poly(acrylic acid)/polypyrrole/Al(III)(CMC/PAA/PPy/ Al(III)) multifunctional hydrogel.
Figure 1 Schematic diagram of the preparation of CMC/PAA/PPy/Al(iii) multifunctional 4span hydrogel.
The mechanical and electrical self-healing properties are through the multiple dynamic coordination between Al3+ ion and CMC and PAA carboxyl group and PPy and -CO/PA of -CO/PA Hydrogen bonds between them. The conductivity is achieved by the synergistic effect between the conductive polymer PPy , free ions, and PPy particles and free ions. In addition, by establishing a balance between the chemical and physical cross-linking network and the nanostructure of PPy, ideal mechanical properties are achieved.For example, stretchability (1344%), toughness and plasticity. Therefore, the resulting hydrogel has potential applications in electronic skin, biomedical implants and wearable electronic devices in the future.
Figure 5 (b) Photographs of hydrogels that can be stretched to 750% (strain) with different PPy-strain (G1 stress) c) Toughness and elastic modulus of hydrogel, (d) Mechanical properties test of optical image hydrogel.
Figure 7 (a) Optical image of the self-healing process at room temperature. (b) The effect of healing time on the stress-strain curve of G1 hydrogel. (c) The effect of healing time on the healing efficiency of G4 hydrogel. (d) The mechanical self-healing efficiency of G1 and G4 hydrogels. (e) Optical image of conduction behavior during self-healing at room temperature. (f) The electrical self-healing efficiency of G1 and G4 hydrogels.
related thesis entitled Polypyrrole-doped conductive self-healing multifunctional composite hydrogels with a dual crosslinked network published in " Soft Matter " on. Corresponding author Yes Northwest Normal University Associate Professor Ren Jie .
References:
doi.org/10.1039/D1SM00span doi.org/10.1039/D1SM00span _span4 _span4 .
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