am7b12932_si_002.avi (4.36 MB)
Tough, Stretchable, Compressive Novel Polymer/Graphene Oxide Nanocomposite Hydrogels with Excellent Self-Healing Performance
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posted on 2017-10-11, 00:00 authored by Chenguang Pan, Libin Liu, Qiang Chen, Qiang Zhang, Gailan GuoDesigning hydrogels
with high mechanical properties without sacrificing
their self-healing efficiencies remains great challenges. We have
fabricated cationic polyacrylamide/graphene oxide (GO) hydrogels by
free-radical polymerization of acrylamide (AM) and 2-(dimethylamino)ethylacrylatemethochloride
(DAC) in the presence of GO. The mechanical properties and self-healing
ability can be tuned by the GO content and the mass ratio of AM and
DAC. The ionic bonds between DAC and GO and the hydrogen bonds between
AM and GO can efficiently dissipate energy and rebuild the networks.
The resulting composite hydrogels possess high stiffness (Young’s
modulus: ∼1.1 MPa), high toughness (∼9.3 MJ m–3), and high fatigue resistance, as well as high self-healing efficiency
(>92% of tensile strength, >99% of tensile strain and >93%
of toughness).
In addition, the completely dried hydrogels can recover their original
mechanical values by spraying water and still possess outstanding
self-healing efficiency. Our design can provide better fundamental
understanding of physical properties of hydrogels and should enable
the development of tough, self-healing hydrogels for practical applications.