ma7b02653_si_001.pdf (2.17 MB)
Tough, Swelling-Resistant, Self-Healing, and Adhesive Dual-Cross-Linked Hydrogels Based on Polymer–Tannic Acid Multiple Hydrogen Bonds
journal contribution
posted on 2018-02-20, 19:52 authored by Hailong Fan, Jiahui Wang, Zhaoxia JinWe demonstrate a
facile and universal strategy in the fabrication of dual-cross-linked
(DC) single network hydrogels with high toughness, “nonswellability”,
rapid self-healing, and versatile adhesiveness based on polymer–tannic
acid (TA) multiple hydrogen bonds. Two widely used hydrogels, physically
cross-linked poly(vinyl alcohol) and chemically cross-linked polyacrylamide,
have been transformed to TA-based DC hydrogels by dipping the corresponding
aerogels into TA solution. The second cross-link via multiple polymer–TA
hydrogen bonds effectively suppresses the crack propagation, resulting
in both DC gels with high mechanical strength. But these two TA-based
DC hydrogels go through different deformation mechanisms during the
stretching based on analyzing their stress–strain curves using
the Mooney–Rivlin equation. Moreover, these DC hydrogels are
swelling-resistant, with strong toughness, good self-recoverability,
rapid self-healing, and versatile adhesiveness. This work provides
a simple route to fabricate multifunctional DC hydrogels, hopefully
promoting their applications as biomedical materials.