Abstract
Chitosan/poly(acrylamide-co-acrylic acid) double network hydrogels based on non-covalent bond and winding between molecular chains were synthesized by copolymerization reaction in the presence of Fe3+. The formation mechanism of chitosan/poly(acrylamide-co-acrylic acid) double network hydrogels was analyzed using UV–Vis spectra and FTIR, revealing that Fe3+ could form the electrostatic interaction with –COO– group in poly(acrylamide-co-acrylic acid) chains, and the –COOH form also the hydrogen bond also with –CONH2 in poly(acrylamide-co-acrylic acid) chains or –NH2 in chitosan chains. Mechanical properties of the prepared double network hydrogels were investigated by rheological and mechanical measurements. These results indicated that the chitosan/poly(acrylamide-co-acrylic acid) double network hydrogels present good recovery ability. The tensile strength and elongation at break of the synthesized hydrogel could reach 141.9 kPa and 18.2 mm/mm, respectively, their compressive strength could reach 1.76 MPa at strain of 85%. In addition, the synthesized hydrogels can maintain good self-healing capacity owing to the dynamically reversible bonds (ionic bond and hydrogel bonding). This work provides a facile method for the synthesis of hydrogels with toughness and self-healing capacity. The synthesized chitosan/poly(acrylamide-co-acrylic acid) double network hydrogels would have a great potential applications in a diverse range.
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This research was supported by the Fundamental Research Funds for the Central Universities (xjj2018269).
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Aihua Shi, Dai, X. & Jing, Z. Tough and Self-Healing Chitosan/Poly(acrylamide-co-acrylic acid) Double Network Hydrogels. Polym. Sci. Ser. A 62, 228–239 (2020). https://doi.org/10.1134/S0965545X20030128
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DOI: https://doi.org/10.1134/S0965545X20030128