Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 45, Pages 14159-14163Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201708614
Keywords
anti-freezing; conductive organohydrogel; hydrogels; self-healing; strain-sensitive
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Funding
- National Key RAMP
- D Program of China [2017YFA0207800]
- National Natural Science Foundation [21574004]
- 111 project [B14009]
- Fundamental Research Funds for the Central Universities
- National Young Thousand Talents Program
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Conductive hydrogels are a class of stretchable conductive materials that are important for various applications. However, water-based conductive hydrogels inevitably lose elasticity and conductivity at subzero temperatures, which severely limits their applications at low temperatures. Herein we report anti-freezing conductive organohydrogels by using an H2O/ethylene glycol binary solvent as dispersion medium. Owing to the freezing tolerance of the binary solvent, our organohydrogels exhibit stable flexibility and strain-sensitivity in the temperature range from -55.0 to 44.6 degrees C. Meanwhile, the solvent molecules could form hydrogen bonds with polyvinyl alcohol (PVA) chains and induce the crystallization of PVA, greatly improving the mechanical strength of the organohydrogels. Furthermore, the non-covalent crosslinks endow the conductive organohydrogels with intriguing remoldability and self-healing capability, which are important for practical applications.
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