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Self-Recoverable Dual-Network Silicon Elastomer Applied in Cell Adhesives

Dual-network
filler-free silicon elastomers with excellent mechanical
properties and high tensile strength (>3 MPa) were fabricated through
physical and chemical cross-linking via Fe3+ ion coordination
and aza-Michael addition, respectively. Dynamic mechanical analysis
and loading–unloading tests were used to analyze the sacrificial
bonds and dual networks in the elastomers. Continuous-wave electron
paramagnetic resonance results revealed the incomplete coordination
and similar chemical environment of Fe­(III) ions in the elastomers.
The coordination bonds dissipated energy, and the chemical cross-linking
maintained the networks; they enhanced tensile strength jointly. The
elastomers demonstrated favorable self and shape recoverability due
to the dynamic reversibility of the coordination bonds and the stress
of the chemical cross-linking in the reshaped elastomers. Such elastomers
could be used as intelligent and sustainable materials. Moreover,
the materials exhibited good biocompatibility and can be utilized
as a type of cell adhesive in bioimaging.