High strength hydrogels with multiple shape-memory ability based on hydrophobic and electrostatic interactions

Hydrogels with multiple shape-memory ability have aroused great interest due to their promising applications in various fields. Nevertheless, the weak mechanical performance of most shape-memory hydrogels seriously impedes the practical application in more complex environments. Herein, we reported a...

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Bibliographic Details
Published in:Soft matter 2019-07, Vol.15 (26), p.5264-527
Main Authors: Jing, Houchao, He, Lin, Feng, Jinyang, Fu, Hai, Guan, Shuang, Guo, Peipei
Format: Article
Language:English
Subjects:
Acrylic acid
Chitosan
Crosslinking
Electrostatic properties
Fatigue strength
Hydrogels
Hydrophobicity
Mechanical properties
Quaternary
Shape effects
Shape memory
Sodium chloride
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Summary:Hydrogels with multiple shape-memory ability have aroused great interest due to their promising applications in various fields. Nevertheless, the weak mechanical performance of most shape-memory hydrogels seriously impedes the practical application in more complex environments. Herein, we reported a novel hydrogel with both high mechanical and multi-shape memory properties composed of stearyl methacrylate (SMA), acrylic acid (AA) and quaternary chitosan (QCH). The electrostatic interactions between AA and QCH together with the hydrophobic interactions of alkyl chains in SMA endowed the hydrogel with great strain-stress and fatigue resistance. Furthermore, due to the reversible destruction and construction of physical cross-links, the prepared hydrogels also exhibited the shape-memory ability in response to different stimuli, such as temperature, pH and NaCl solution. Additionally, the multiple shape-memory effect could be accomplished via programmable combination because of the relatively independent physical interactions in the hydrogels. High strength hydrogels with programmable shape-memory and notch insensitive abilities.
ISSN:1744-683X
1744-6848
DOI:10.1039/c9sm00869a