Laser-Induced Remote Healing of Stretchable Diselenide-Containing Conductive Composites

Abstract

Remotely controlled on-demand functional healing is vital to components that are difficult to access and repair in distance such as satellites and unmanned cruising aircrafts. Compared with other stimuli, a blue laser is a better choice to input energy to the damaged area in distance because of its high energy density and low dissipation through the air. Herein, diselenide-containing polyurethane (PUSe) is first employed to fabricate visible light-responsive stretchable conductive composites with multiwalled carbon nanotubes (MWCNTs). Then, laser-induced remote healing was realized based on the characteristics of long-distance propagation of lasers and the dynamic properties of diselenide bonds. Moreover, the PUSe/MWCNT composite film can be used to transfer an electrical signal in the circuit containing a signal generator. This laser-induced remote healing of conductivity paves the way for developing healing conductors which are difficult to access and repair.

Interlocked Covalent Adaptable Networks and Composites Relying on Parallel Connection of Aromatic Disulfide and Aromatic Imine Cross-Links in Epoxy

“…Over the past several decades, various types of CANs have been developed, relying on different dynamic bonds, from Diels−Alder reactions 9−11 to transesterification, 12−16 from imine exchange 17−20 to disulfide metathesis, 21−26 from siloxane equilibration 27−29 to dioxaborolane metathesis, 30−32 etc. In addition, more dynamic bonds including cation−π interactions, 33 urea bonds, 34−36 host− guest interactions (also named mechanical interlocked networks, MINs), 37 and diselenide bonds 38,39 are developed to form CANs. Due to the reversibility of dynamic bonds, the CANs are able to be degraded on demand and the composites become recyclable, but they suffer accidental degradation and failure upon a certain stimulus in the application environment at the same time.…”

“…Over the past several decades, various types of CANs have been developed, relying on different dynamic bonds, from Diels–Alder reactions − to transesterification, − from imine exchange − to disulfide metathesis, − from siloxane equilibration − to dioxaborolane metathesis, − etc. In addition, more dynamic bonds including cation−π interactions, urea bonds, − host–guest interactions (also named mechanical interlocked networks, MINs), and diselenide bonds , are developed to form CANs.…”

Mechanochemistry of dynamic chalcogen-containing polymers: a minireview

“…Chalcogen elements, including S, Se and Te in the group 6A of the periodic table and sometimes O, have been discovered to be capable of undergoing various dynamic interactions, including chalcogen bonding, 30 coordinate bonding, dynamic chalcogenchalcogen bond, [31][32][33][34][35][36] etc. By using external stimuli to control these dynamic interactions, functional molecules and materials with specific stimuli-responsiveness can be achieved in both artificial [37][38][39][40][41][42][43][44] and natural systems. 45,46 Among all the dynamic covalent bonds, chalcogen-containing dynamic bonds have relatively low bond energy, 29 suggesting generally better mechanoresponsiveness.…”

Water-Enhanced and Remote Self-Healing Elastomers in Various Harsh Environments

“…Inspired by nature’s underwater blue window, , which means that blue light could propagate over longer distances than other wavelengths of light in the water, we report a kind of elastomer material that can recover 100% of its toughness within 1 h irradiated by a blue laser at a distance of 3 m underwater and the healing efficiency of the material is not affected by various harsh environments (acids, bases, ice water, and seawater). Diselenide bond, − a water-stable visible-light-responsive dynamic covalent bond, is introduced into the material as the main driving force for healing. The hydrophobic backbone poly­(dimethylsiloxane) (PDMS) was utilized to maintain a low swelling ratio in water, and the abundant hydrogen bonds (HBs) between the neighboring urea bonds served as an auxiliary driving force for healing, − and at the same time as a noncovalent cross-linker to endow the material with good ductility and elasticity.…”