Study on high toughness and strong electromagnetic shielding properties of PAM/PEG dual network hydrogels

With the wide application of electromagnetic wave, a high performance electromagnetic shielding material is urgently needed to solve the harm caused by electromagnetic wave. Complete cross-linking strategy is adopted in this paper. Polyacrylamide (PAM) was synthesized by in-situ polymerization of AM (acrylamide) monomer. The obtained PAM was blended with polyethylene glycol (PEG) to prepare PAM/PEG hydrogels and form rigid support structures. Subsequently, the modified carbon nanotubes (S-CNTs) were incorporated into sodium alginate (SA) and PAM/PEG. Finally, Na+ was used to trigger SA self-assembly, which significantly improved the mechanical properties and electrical conductivity of the hydrogels, and prepared PAM/PEG/SA/S-CNTs-Na hydrogels with high toughness and strong electromagnetic shielding (EMI). The results showed that the compressive strength of PAM/PEG/SA/S-CNTs-Na hydrogel was 19.05 MPa, while that of PAM/PEG hydrogel was 17.69 MPa, which was 107.69% higher than that of PAM/PEG hydrogel. More encouraging, the total electromagnetic shielding efficiency (SET) of PAM/PEG/SA/S-CNTs-Na hydrogels at a thickness of only 3 mm and a CNTs content of 20 wt% was 32.92 dB, 213.17% higher than that of PAM/PEG hydrogels (15.44 dB).