Study on Dual Ionically Crosslinked Sodium Alginate/Poly(acrylamide-co-acrylic acid) High Strength Hydrogel
LI Xuefeng1,2, WANG Hui2, LONG Shijun1,2, HUANG Yiwan1,2, LI Haiyan3
1 Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China; 2 School of Materials Science and Engineering, Hubei University of Technology, Wuhan 430068, China; 3 School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
Abstract: High strength and toughness dual ionically crosslinked sodium alginate/poly(acrylamide-co-acrylic acid) (S/P-Fe3+) double network hydrogels were prepared by “one-step” dual ionically crosslinking. We take advantage of the abundant carboxyl groups on alginate molecules and the copolymer chains and their high coordination capacity with multivalent cations to obtain high strength and toughness. The mechanical properties of hydrogels with different cations dual crosslinked were obtained by soaking different cations (Na+, Ca2+, Cu2+, Al3+, Fe3+), the results show that the mechanical strength of hydrogels increases with the increase of the valence state of cations, among which the mechanical properties of Fe3+ dual crosslinked hydrogels are much higher than the other cations. By adjusting the content of SA, the ratio of AAc to AAm, and the concentration of Fe3+, the optimal S/P-Fe3+ (SA 2wt% and AAc 5mol%) hydrogels showed a remarkable mechanical performance with 3.24 MPa tensile strength and 1 228% strain, both of which remained stable with 76% water content. In addition, the crosslinked strength of S/P-Fe3+ hydrogel is affected by the environment of pH, and the hydrogels with different mechanical properties and shape memory can be obtained by pH adjustment.
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2020, Vol. 34 
