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摘要
Shape memory hydrogels (SMHs), a type of intelligent soft material, have received a lot of attention. However, their applications in smart actuators have been hampered by difficult preparation and slow, single-shape change. As raw ingredients for this experiment, we select acrylamide (AAm), methacrylic acid (MAA), and acrylonitrile (AN), while tetramethyl ethylenediamine (TEMED) serves as an accelerator. Besides, we employ a straightforward polymerization method to create the thermally sensitive shape memory supermolecule hydrogel (P(AMA)), which is produced by synergistically combining dipole-dipole interactions with hydrogen bonds (H-bonds). The resulting hydrogel exhibits a high toughness (1.11 ± 0.06 MJ/m3), strong tensile strength (0.22 ± 0.02 MPa), and significant stretchability (up to 1,000%). Additionally, the hydrogel possesses outstanding temperature-responsive shape memory behavior, which can be fixed in a temporary shape in only 5 min at 10 °C and recover to the original shape in 10 s at 37 °C. This is based on the dissociation and reconstruction of reversible physical crosslinks. The shape memory supramolecular hydrogel created in this work also has the benefits of being easily made, inexpensive, highly durable, and having programmable shape memory, etc. This opens up a wide range of potential applications in actuators, soft robotics, electronic skin, and other areas. ? 2024 Science Press.
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