Self-Healing and Moldable Poly(2-isopropenyl-2-oxazoline)
Supramolecular Hydrogels Based on a Transient Metal Coordination Network
Posted on 2020-07-24 - 18:38
Materials
that are capable of autonomous healing upon damage is
the focus of many research groups because of the numerous potential
applications of these materials, such as coatings, actuators for robotic
applications, and wound healing. Although significant progress in
the area has been achieved, the synthesis and large-scale applications
of self-healing and moldable materials continue to be challenging.
The present study highlights the use of poly(2-isopropenyl-2-oxazoline)
partially modified with 2,2′:6′,2″-terpyridine-4′-carboxylic
acid (TPy) for the synthesis of self-healing and moldable metallo-supramolecular
hydrogels by metal coordination. The hydrogelation was triggered by
the addition of divalent transition metal ions (e.g., Fe2+, Ni2+, Co2+, and Zn2+). Using this
approach, metallo-supramolecular hydrogels with tunable rheological
properties could be obtained, while evidencing the correlation between
the hydrogel mechanical properties and the binding strength and kinetic
lability of the supramolecular cross-linking motifs. The resulting
hydrogels exhibited rapid self-healing properties at room temperature
as confirmed by rheological measurements. Moreover, hydrogels cross-linked
with Co2+ and Zn2+ showed a gel–sol transition,
indicative of the higher kinetic lability of their complexes. The
hydrogels exhibited fast and excellent repeatable autonomic healing
capacity even at higher cross-linking density, making them useful
as autonomously repairing materials and coatings. Compared to the
conventional metallo-hydrogels, the herein developed hydrogels can
be molded into a variety of complex geometrical shapes, which could
be potentially applied in various areas from soft robotics to dynamic
self-healing coatings.
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Xu, Xiaowen; Jerca, Florica Adriana; Jerca, Valentin Victor; Hoogenboom, Richard (2020). Self-Healing and Moldable Poly(2-isopropenyl-2-oxazoline)
Supramolecular Hydrogels Based on a Transient Metal Coordination Network. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.0c01242
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AUTHORS (4)
XX
Xiaowen Xu
FJ
Florica Adriana Jerca
VJ
Valentin Victor Jerca
RH
Richard Hoogenboom