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Tannic Acid-Based Multifunctional Hydrogels with Facile Adjustable Adhesion and Cohesion Contributed by Polyphenol Supramolecular Chemistry
journal contribution
posted on 2017-10-12, 08:13 authored by Hailong Fan, Jiahui Wang, Qiuya Zhang, Zhaoxia JinAdhesiveness of hydrogels
depends on the balance and synergy of
their cohesion and adhesion. However, it is a challenge to fabricate
catechol-based hydrogels with high adhesiveness because the required
condition for cohesion and adhesion of these hydrogels is in conflict
with each other: strong cohesion (gelation) requires a weak basic
condition, whereas strong adhesion requires an acidic condition. Here,
we demonstrated that by utilizing polyphenol supramolecular chemistry,
the coexistence of strong cohesion and adhesion can be achieved in
a hydrogel via the one-pot method. Poly(dimethyl diallyl ammonium
chloride)/tannic acid (PDDA/TA) hydrogel has been studied as a proof
of concept. Compared with catechol moieties that covalently grafted
on polymer chains, TA can bring high density of pyrogallol/catechol
functional groups for polymers via a noncovalent pathway, as well
as high acidity in the system. As a result, the cohesion of the hydrogel
is enhanced significantly, the highest storage moduli can reach up
to ca. 0.15 MPa; besides, the high acidity of the hydrogel prevents
pyrogallol/catechol groups from oxidation and guarantees strong adhesion;
thus, the hydrogel can adhere to diverse substrates steadily, including
tissues, glass, metals, and plastic. Moreover, because of the adjustable
adhesiveness via changing the pH, the PDDA/TA hydrogel becomes a unique
system with patternable adhesiveness. In addition, the hydrogel has
rapid self-healing and high ionic conductivity (∼4.3 S m–1). This study demonstrates that utilizing polyphenol
chemistry in the construction of hydrogels opens a new path toward
multifunctional hydrogels with improved properties.
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Tannic Acid-Based Multifunctional Hydrogelsacidic conditionFacile Adjustable AdhesionPDDAPolyphenol Supramolecular Chemistry AdhesivenessadhesionCohesion Contributedstorage modulipolyphenol chemistrycatechol moietiesnoncovalent pathwaycatechol-based hydrogelsone-pot methodpolyphenol supramolecular chemistrymultifunctional hydrogelsTApatternable adhesivenesscohesion0.15 MPapolymer chains
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