| POLYMERS AND POLYMER COMPOSITES |
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| 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
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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 |
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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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Published: 24 July 2020
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51273059),the Foundation of Wuhan Science and Techno-logy Bureau (2019010701011397). |
| About author:: Xuefeng Li, Ph.D., is currently a professor at the School of Materials and Chemical Engineering at Hubei University of Technology. He has been engaged in teaching and research in the field of polymer materials. As the project leader, he completed two national natural science funds, a number of provincial and ministerial-level and enterprise cooperative scientific research projects. In recent years, he has published more than 70 journal papers as the first author or correspondent author, including more than 40 articles in the international three major indexes, applied 21 national invention patents and 15 of them were authorized, and is also a reviewer of several academic journals. The main winners were awarded the first prize of Hubei Science and Technology Progress Award, the second prize of Wuhan Science and Technology Progress Award, and the first prize of Hubei Province Teaching Achievement Award. |
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2020, Vol. 34 
