Hofmeister Effect-assisted One Step Fabrication of Ion-conductive, Anti-freezing, and Tough PVA Hydrogels
CHEN Jiwei1,*, ZHU Huiwen1, WANG Haibin1, SANG Jianquan1, LI Yanhua1, XIONG Fen2, LUO Jianxin1,*
1 School of Materials Science and Engineering, Hunan Institute of Technology, Hengyang 421002, Hunan, China 2 School of Computer Science and Engineering, Hunan Institute of Technology, Hengyang 421002, Hunan, China
Abstract: Due to the hydrogels with high-water content, hydrogels typically exhibit low mechanical properties and anti-freezing performance. Usually, these performances were improved by reducing the water content of the hydrogels. While this limited the applications of the hydrogels. This work used a one-step soaking method, utilizing the Hofmeister effect to induce the polyvinyl alcohol (PVA) polymer chain self-assemble forming a uniform hydrophobic entangled cross-linked network and hydrogen bond cross-linked network structure. The inorganic salt ions introduced in the Hofmeister effect can also form hydration with water molecules. These can endow the PVA hydrogels good mechanical flexibility and anti-freezing performance, constructing the PVA hydrogels with high mechanical flexibility (breaking strength and elongation at break of 25.02 MPa and 935%, respectively) and anti-freezing performance (freezing point of -47.6 ℃). Besides, the introduction of salt ions can also provide free-moving ions for the ionic conductivity of the hydrogels. This hydrogel with excellent comprehensive properties can be applied to the field of flexible ionic conductivity with wide operating temperature and mechanical performance requirements.
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2025, Vol. 39 
