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摘要If self-healing materials can be prepared via simple technology and methods using nontoxic materials,this would be a great step forward in the creation of environmentally friendly self-healing materials.In this paper,the specific structural parameters of the various hydrogen bonds between chitosan and polyacrylic acid were calculated.Then,multilayer polyelectrolyte films were fabricated with chitosan and polyacrylic acid based on layer-by-layer self-assemble technology at different pH values.The possible influence of pH on the(chitosan/polyacrylic acid)*30 multilayer polyelectrolyte film were investigated.The results show that the interactions between chitosan and polyacrylic acid,swelling capacity,microstructure,wettability,and self-healing ability are all governed by the pH of the chitosan solution.When the pH value of the chitosan solution is 3.0,the prepared multilayer polyelectrolyte film has fine-tuned interactions,a network-like structure,good swelling ability,good hydrophilicity,and excellent self-healing ability.This promises to greatly widen the future applications of environmentally friendly materials and bio-materials.