A PVA / ANF ion conductive hydrogel based on solvent exchange and a preparation method thereof

By constructing a hydrogen bond-enhanced and ion-coordinated synergistic crosslinking network for PVA/ANF ion-conductive hydrogels, the contradiction between high strength and toughness and high ion conductivity in conductive hydrogels was resolved, enabling the material to be widely used in flexible sensors and energy storage devices.

CN122127625APending Publication Date: 2026-06-02XIAN TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN TECH UNIV
Filing Date
2026-03-18
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing conductive hydrogels present a contradiction in balancing high strength and toughness with high ionic conductivity, making it difficult to simultaneously achieve the sensitive response and cycle stability of flexible sensors, as well as the ion transport capability and service reliability requirements of flexible energy storage devices.

Method used

Using polyvinyl alcohol (PVA) as a flexible matrix and aramid nanofibers (ANF) as a reinforcing skeleton, a composite network structure with hydrogen bond reinforcement and ion coordination synergistic crosslinking is formed by using a salt solution containing sulfate anions for solvent exchange through low-temperature freezing pretreatment and solvent exchange process.

Benefits of technology

The prepared PVA/ANF ion-conductive hydrogel has high mechanical strength, toughness and high ion conductivity, and is suitable for flexible sensors and flexible supercapacitors. The ultimate stress can reach 2.5~3.5 MPa, the elongation at break is 1100~1200% and the ion conductivity is 8~10 mS·cm-1.

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Abstract

This invention provides a PVA / ANF ion-conducting hydrogel based on solvent exchange and its preparation method. Aramid fibers are deprotonated and dispersed in KOH / DMSO to obtain an ANF dispersion; this dispersion is then mixed with a PVA / DMSO solution and freeze-set, followed by preparation with SO42-. 2‑ Solvent exchange was performed on a metal salt solution to remove DMSO while inducing hydrogen bond reconstruction between ANF and PVA to form a three-dimensional network, and K was introduced simultaneously. + Zn 2+ Or Al 3+ Based on the Hofmeister effect, SO4 is fixed. 2‑ To enhance the hydration of anions and optimize the network structure, the crosslinking density is controlled by the differential coordination between cations of different valence states and the deprotonation sites of ANF; among which Zn 2+ With moderate coordination strength, the hydrogel can enhance network stability while maintaining segment mobility, achieving a synergistic improvement in mechanical properties and ionic conductivity. The hydrogel can be used in flexible electronics, energy storage devices, and biomedical materials.
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