Traditional hydrogels have problems such as low mechanical strength and limited elongation,the innovative development of high-strength hydrogels has effectively expanded the potential applications of this material in various fields,such as artificial skin,soft robots,etc.Therefore,it is very important and valuable to study high-strength hydrogels.In this project,polyvinyl alcohol(PVA)and sodium alginate(SA)were used as the main raw materials in the experimental process,hydrogels were prepared by using the freeze-thaw cycling method.The influence of raw material ratio,freezing times and Ca2+on the tensile strength of PVA-SA hydrogel was preliminarily explored,and the rebound ability,water loss and swelling ability were also explored.
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