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Cooling-Triggered Shapeshifting Hydrogels with Multi-Shape Memory Performance
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DOI：10.1002/adma.201707461.png)
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Abstract
En 中文
Heating-triggered shape actuation is vital for biomedical applications. The likely overheating and subsequent damage of surrounding tissue, however, severely limit its utilization in vivo. Herein, cooling-triggered shapeshifting is achieved by designing dual-network hydrogels that integrate a permanent network for elastic energy storage and a reversible network of hydrophobic crosslinks for freezing temporary shapes when heated. Upon cooling to 10 degrees C, the hydrophobic interactions weaken and allow recovery of the original shape, and thus programmable shape alterations. Further, multiple temporary shapes can be encoded independently at either different temperatures or different times during the isothermal network formation. The ability of these hydrogels to shapeshift at benign conditions may revolutionize biomedical implants and soft robotics.
Keywords:
hydrogels
hydrophobic interactions
multi-shape memory
polymer networks
shapeshifting
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