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Halogen-bonded shape memory polymers
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DOI：10.1038/s41467-022-34962-7.png)
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摘要
En 中文
Halogen bonding (XB), a non-covalent interaction between an electron-deficient halogen atom and a Lewis base, is widely adopted in organic synthesis and supramolecular crystal engineering. However, the roadmap towards materials applications is hindered by the challenges in harnessing this relatively weak intermolecular interaction to devise human-commanded stimuli-responsive soft materials. Here, we report a liquid crystalline network comprising permanent covalent crosslinks and dynamic halogen bond crosslinks, which possess reversible thermo-responsive shape memory behaviour. Our findings suggest that I center dot center dot center dot N halogen bond, a paradigmatic motif in crystal engineering studies, enables temporary shape fixation at room temperature and subsequent shape recovery in response to human body temperature. We demonstrate versatile shape programming of the halogen-bonded polymer networks through human-hand operation and propose a micro-robotic injection model for complex 1D to 3D shape morphing in aqueous media at 37 degrees C. Through systematic structure-property-performance studies, we show the necessity of the I center dot center dot center dot N crosslinks in driving the shape memory effect. The halogen-bonded shape memory polymers expand the toolbox for the preparation of smart supramolecular constructs with tailored mechanical properties and thermoresponsive behaviour, for the needs of, e.g., future medical devices. Halogen bonding is widely adopted in organic synthesis and supramolecular crystal engineering but application of halogen bonding in the design of stimuli-responsive materials is challenging. Here, the authors report a liquid crystalline network that contains dynamic halogen-bond crosslinks and possesses reversible thermo-responsive shape memory behaviour.
Keyword:
CENTER-DOT-PI
MECHANICAL-PROPERTIES
COCRYSTALS
HYDROGEN
BEHAVIOR
TEMPERATURE
NETWORKS
FLUORINE
DESIGN
DONORS
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期刊
IF:
15.7
论文数:
9.6W
被引数:
104.0W
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