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Editable and bidirectional shape memory chitin hydrogels based on physical/chemical crosslinking

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Abstract

Advances in soft robotics have enabled rapid progress in shape memory hydrogels, including unidirectional, bidirectional and multidirectional shape memory hydrogels. However, shape memory hydrogels with editable feature have hardly been reported. Here, chitin based bilayer hydrogels were prepared based on alkali/urea aqueous system. Due to the different swelling properties of the two layers, namely physical crosslinking layer and chemical crosslinking layer, the hydrogels can bend toward opposite direction in water and ethanol, showing a bidirectional shape memory behavior. Meanwhile, this bidirectional shape memory hydrogels can be programmed to different shapes with external force after immerging in alkali solution as a result of the hydrogen bond breakage and reformation via hydroxyl ion, displaying an editable feature. We believe that the editable and bidirectional shape memory chitin bilayer hydrogels have great potential in soft robotics.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51373147 and 51673162).

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Authors and Affiliations

  1. State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan, 430200, China

    Kunkun Zhu

  2. Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

    Kunkun Zhu & Jinlian Hu

  3. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China

    Lina Zhang

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  1. Kunkun Zhu
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  2. Jinlian Hu
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  3. Lina Zhang
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Correspondence to Jinlian Hu.

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Zhu, K., Hu, J. & Zhang, L. Editable and bidirectional shape memory chitin hydrogels based on physical/chemical crosslinking. Cellulose 26, 9085–9094 (2019). https://doi.org/10.1007/s10570-019-02729-x

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