Journal
MATERIALS & DESIGN
Volume 148, Issue -, Pages 96-103Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.03.047
Keywords
Hydrogel; Self-healing; Conductivity; Dual-network; Ionic linkages
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Funding
- Fundamental Research Funds for the Central Universities [2242017K41030]
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Weherein present dual-network self-healing hydrogels via ionic cross-linking and hydrogel bonds based on chitosan molecular chain as a template. Chitosan and poly(acrylic acid) were reacted to form a dual-network structure via Fe3+ ion coordination and hydrogen bonds. The healing property mainly depends on the coordination between Fe3+ ions and -COOH or -NH2 groups of the polymer chains, as well as on the hydrogen bonds occurring among-OH, -NH2 and -COOH groups. Compared with the covalent cross-linking points, the ionic linkages and hydrogen bonds in the hydrogels were stochastic and dynamic. Hence, if the hydrogel becomes cracked or possesses a notch, the cross-linking points will be destroyed, while the new ones will be re-formed based on the dual-network of the hydrogel. The self-healing efficiency of the as-prepared hydrogel could reach 98.5% when the concentration range of 0.01-0.5 M Fe3+ aqueous solution was used. In addition, both the compression resistance and electrical conductivity of the hydrogel were enhanced with FeCl3 content increasing. Therefore, the as-prepared hydrogel exhibited excellent stretchability, compression resistance, self-healing performance without any external stimulus, and electrical conductivity. (C) 2018 Published by Elsevier Ltd.
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