%0 Journal Article
%T Ultrastiff, Tough, and Healable Ionic¨CHydrogen Bond Cross-Linked Hydrogels and Their Uses as Building Blocks To Construct Complex Hydrogel Structures
%J -
%D 2019
%R https://doi.org/10.1021/acsami.8b20520
%X We report the ultrastiff and tough poly(acrylamide-co-acrylic acid)/Na-alginate/Fe3+ (P(AM-co-AA)/Na-alginate/Fe3+) hydrogel via the formation of hybrid ionic¨Chydrogen bond cross-linking networks. The optimal P(AM-co-AA)/Na-alginate/Fe3+ hydrogel possessed super high elastic modulus (ˇ«24.6 MPa), tensile strength (ˇ«10.4 MPa), compression strength (ˇ«44 MPa), and toughness (ˇ«4800 J/m2). The P(AM-co-AA)/Na-alginate/Fe3+ hydrogel was highly stable and maintained its superior mechanical properties in 0.5¨C2 M NaCl solution, aqueous solution with pH ranging from 4 to 10. The ionic cross-linking networks of the P(AM-co-AA)/Na-alginate/Fe3+ hydrogels can be locally and selectively dissociated by treating with aqueous NaOH solution with pH of 13 for 1 min and reformed by locally adding the additional Fe3+ solutions, making the hydrogels healable and cohesive. The healed hydrogels from the cutting surfaces can bear a tensile strength of up to 7.1 MPa. Various complex hydrogel structures can be constructed by using the P(AM-co-AA)/Na-alginate/Fe3+ hydrogels as building blocks via the adhesion of as-prepared hydrogels
%U https://pubs.acs.org/doi/10.1021/acsami.8b20520