It is a challenge to synthesize materials that possess the properties of high stretchability and self-healability. Herein a new poly(dimethylsiloxane) elastomer with high stretchability, room-temperature self-healability, repeatable reprocessability, and controlled degradability is reported by incorporating an aromatic disulfide bond and imine bond. The as-prepared elastomer can be stretched to over 2200% of its original length. Without external stimuli, a damaged sheet can completely heal in 4 h. In addition, the elastomer can be reprocessed multiple times without obvious performance degradation and degraded controllably by three ways. All these properties of the elastomer can be ascribed to the unique dual-dynamic-covalent sacrificial system.
A new kind of polysiloxane‐supported ionogel is successfully designed via locking ionic liquids (ILs), 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][Tf2N]), into poly(aminopropyl‐methylsiloxane) (PAPMS) grafted with [2‐(methacryloyloxy)ethyl] trimethylammonium chloride (METAC) in the presence of tannic acid (TA). The novel ionogel exhibits good mechanical and recovery properties, as well as high ionic conductivity (1.19 mS cm−1) at 25 °C. In addition, the totally physical dual‐crosslinked network based on ionic aggregates among METAC and the hydrogen bonds between PAPMS and TA provides excellent self‐healing ability, which allows the damaged ionogel to almost completely heal (≈83%) in 12 h at room temperature. Interestingly, the obtained ionogel also shows satisfactory adhesive behavior to various solid materials. Moreover, this novel ionogel can maintain its high ionic conductivity and recovery property even at subzero temperatures. Therefore, this polysiloxane‐supported ionogel is anticipated to be advantageous in flexible electronic devices such as sensors and supercapacitors, even at low temperatures.
Flexible
sensing materials have attracted tremendous attention
in recent years because of their potential applications in the fields
of health monitoring, artificial intelligence, and so on. However,
the preparation of rate sensing materials with self-healing performance
is always a huge challenge. Herein, we first report the design and
synthesis of a highly stretchable, recyclable, self-healing polysiloxane
elastomer with rate sensing capability. The elastomer is composed
of a dynamic dual network with boron/oxygen dative bonds and hydrogen
bonds, which overcomes the structural instability of conventional
solid–liquid materials. It exhibits certain adhesion, satisfactory
mechanical robustness, and superior elongation at break (up to 1171%).
After heating treatment at 80 °C for 2–4 h, the mechanical
properties of damaged materials can be almost completely restored.
Because of the “solid–liquid” property of the
elastomer, it has irreplaceable functions which can sense different
rates by resistance change after blending with multiwalled carbon
nanotubes, principally in the range of 10 mm/min–150 mm/min.
Especially, this rate sensing elastomer can be personalized by 3D
printing at room temperature. This rate sensing strategy coupled with
the introduction of dynamic dual-network structure is expected to
help design advanced wearable devices for human rhythmic movement.
The polydimethylisioxane elastomer based on Diels–Alder (DA) chemistry is successfully prepared by directly crosslinking bis(3‐aminopropyl)‐terminated polydimethylsiloxane with the bisepoxide containing two DA bonds in one molecule via epoxy‐amine reaction. The elastomer prepared based on DA chemistry exhibits good mechanical property, high self‐healing, and remolded efficiencies. The as‐prepared elastomer can be stretched to over 400% and its tensile strength can reach 0.80 MPa. The self‐healing efficiency and remolded efficiency are up to 93% and 95%, respectively. This work provides a simple and efficient way to fabricate the self‐healing and remolded polydimethylsiloxane elastomer with good mechanical properties. The as‐prepared elastomer has a promising potential in artificial muscles, protective coatings, and intelligent flexible electronics.
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