High-strength and high-toughness sodium alginate/polyacrylamide double physically crosslinked network hydrogel with superior self-healing and self-recovery properties prepared by a one-pot method

Double-network hydrogels have become a research hotspot in the field of hydrogels because of their high strength and toughness. Here, we prepared PAM/SA-Fe dual physically crosslinked hydrogels formed by hydrophobic association and ionic coordination. The fracture stress, elastic modulus and toughness of the PAM/SA-Fe hydrogel are 1.39 MPa, 122.12 kPa and 7320.83 kJ/m3 respectively. The hydrogel also has excellent self-recovery, puncture...