| Stretchable ionic conductor has great application prospect in flexible electronics because of its unique signal transmission mode,good biocompatibility and low cost.However,most ionic conductor devices are easily damaged during use,which leads to the loss of their original mechanical strength and performance.The use of aqueous ionic conductor(hydrogel)is limited by high and low temperature environment;However,the non-aqueous ionic conductor(ionic gel)has the risk of leakage of ionic liquid in use.The polymerizable deep eutectic solvent,which has polymerizable monomer,can be rapidly solidified into super molecular eutectic polymer by UV irradiation under the action of initiator.As a new type of ionic conductor,the polymer has the unique advantages of low temperature resistance,organic solvent resistance,easy preparation,no post-treatment,100%atomic utilization rate and so on,which just makes up for the shortcomings of hydrogel and ionic gel.However,the current research on deep eutectic polymers has some problems,such as low mechanical strength,failure to give consideration to high mechanical strength,self-healing and conductivity.Therefore,it is still a difficult problem to develop deep eutectic polymer materials with high mechanical strength,self-healing and conductivity.Therefore,in this paper,the in-situ photopolymerization method of Polymerizable Deep Eutectic Solvents(PDES)was used to quickly prepare deep eutectic polymers with high tensile strength,excellent self-healing,good ionic conductivity and optical transmittance.Finally,we applied the polymer into the field of paper-based conductive materials.Specific research contents were as follows:(1)Based on the design concept that amino groups in Polyethyleneimine(PEI)can form noncovalent hydrogen bonding force with choline chloride(Ch Cl)and acrylic acid(AA),in this chapter,we added PEI to Ch Cl-AA PDES monomer to form a mixed solution.The PDES monomer was rapidly in-situ photopolymerized under the action of photoinitiator to form deep eutectic polymer with high mechanical strength.The results showed that the mechanical properties of the prepared deep eutectic polymer can be selectively regulated according to the amount of PEI.With the increased of PEI proportion,the degree of intermolecular hydrogen bond crosslinking increased.The tensile strength of the deep eutectic polymer material gradually increased from 2.4 MPa to 9 MPa and the mechanical strength increased by about 4times when the elongation at break was almost constant(?500%).At the same time,the ionic conductivity of deep eutectic polymer was about 0.66×10-3 S/m?2.0×10-3 S/m,and the electrical properties of deep eutectic polymer remained stable under different bending angles.(2)The design idea of the experiment in this chapter was that the synergistic effect of hydrogen bond and coordination bond can improve the mechanical strength of materials.Choline chloride(Ch Cl),acrylic acid(AA)and hydrated metal halide(Al Cl3·6H2O)were selected as hydrogen bond acceptor,donor and metal salt respectively to form PDES prepolymer solution at 90?,and then they polymerized into deep eutectic polymer under the action of photoinitiator.The results showed that the deep eutectic polymer,namely tough yet self-healing,transparent conductive elastomers(TSHTCEs),prepared based on the cooperative action strategy of Al3+coordination bond and hydrogen bond had excellent mechanical properties and self-healing properties.When Al(III)content was 1/50 mol,the maximum tensile strain of TSHTCEs was?900%,the maximum tensile stress was?5 MPa,the toughness was about 21.87 MJ/m3,and it can easily lift more than 1000 times of its own load and withstand piercing of sharp objects.Compared with the blank sample,the fracture strength was increased by about 5 times when the tensile strain was increased by about 1 times.At the same time,it also had high transparency(?92%light transmittance)and high ionic conductivity(6.64×10-3S/m?10.29×10-3S/m).Excellent self-healing efficiency was 82.8%after 72 hours at room temperature.(3)A series of UV-curable color ionic conductive inks were prepared based on Ch Cl-AA and three hydrated metal chlorides(Fe Cl3·6H2O,Co Cl2·6H2O and Ni Cl2·6H2O).The viscosity of the prepared ink was 48?55 mpa·s,the density was 0.6?0.8 g/cm3 and the electrical conductivity was 2.54?4.27 m S/cm3.The color of PDES-Co and PDES-Ni ionic conductive ink can be selectively regulated between blue-red and blue-green.As the color and various physical and chemical properties can be controlled by UV light curing ionic conductive ink,it can be printed on the paper by simple screen printing way,and through rapid light curing process by hydrogen bond and coordination bond action firmly attached to the paper surface.It was worth mentioning that the coated paper had excellent mechanical properties(breaking strength increased to 11 MPa)and electrical properties(1.0 m S/cm). |
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