期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 37, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202103917
关键词
ionic bonds; metal-ligand bonds; polyampholyte hydrogels; strain sensors; strengthening; toughening
类别
资金
- National Natural Science Foundation of China [51903079, 52073083]
- Foundation of Wuhan Science and Technology Bureau [2019010701011397]
- Doctoral Scientific Research Starting Foundation of Hubei University of Technology [BSQD2019029]
- Hubei Provincial Hundred Young Talents Program
- Open Fund of Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology [201907B05]
This study introduces a strategy to fabricate strong and tough PA hydrogels through a secondary equilibrium approach that enhances the network structure by the synergy of ionic and metal-ligand bonds. The method is proven to be applicable to different PA gel systems and diverse multivalent metal-ions, with stable ion-conductivity making it suitable for strain sensors.
Despite existing in biological systems, developing synthetic polyampholyte (PA) hydrogels constructed by both ionic and metal-ligand bonds remains challenging. Herein, a simple secondary equilibrium approach is proposed to fabricate strong and tough PA hydrogels via the synergy of ionic and metal-ligand bonds. The original PA gels (constructed by ionic bonds) are first dialyzed in multivalent metal-ion solutions to reach a swelling equilibrium and then moved to deionized water to dialyze excess free ions to achieve a new equilibrium. Through this approach, the original PA gel network can be optimized and eventually constructed by ionic and metal-ligand bonds, enabling a synergistic reinforcement. By selecting different original PA gel systems and diverse multivalent metal-ions, the proposed approach is proved to be generalizable to fabricate strong and tough PA gels. Additionally, the hydrogels have stable ion-conductivity even at the water-equilibrium state, making them promising as strain sensors. The viscoelastic and elastic contributions to the mechanical properties of the hydrogels by a viscoelastic model are also discussed to further understand the strengthening and toughening mechanisms. The proposed strategy is simple but effective for achieving strong and tough PA-based hydrogels. This study also provides new insights for PA hydrogels in electrolyte environments.
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