A flexible hydrogel based on a cellulose framework, its preparation method and application

Flexible hydrogels with cellulose frameworks were prepared by time-gradient alkali treatment and in-situ polymerization, which solved the problems of cumbersome processes and structure-performance imbalance in existing wood-based hydrogels. This resulted in a synergistic enhancement of high sensitivity and mechanical strength, making them suitable for wearable health monitoring and smart writing boards.

CN120944140BActive Publication Date: 2026-06-30NORTHEAST FORESTRY UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHEAST FORESTRY UNIV
Filing Date
2025-09-28
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing wood-based hydrogels have complicated and costly preparation processes, making it difficult to precisely control the microstructure of the cellulose framework. This results in materials that are prone to collapse or lack flexibility under high pressure, failing to balance high sensitivity and cycle durability. The structure-performance imbalance makes it difficult to meet the long-term use requirements of dynamic environments.

Method used

A time-gradient alkali treatment combined with in-situ polymerization was employed. Lignin was removed using a glacial acetic acid/sodium chlorite system, followed by time-gradient treatment in a sodium hydroxide solution to prepare a cellulose framework. Acrylamide monomers were then in-situ polymerized using ultraviolet light to form a strongly interfacially bonded ion-conductive hydrogel.

Benefits of technology

Precise control of the supramolecular structure of the cellulose framework was achieved, which enhanced the flexibility and mechanical strength of the hydrogel, ensured ionic conductivity and high-sensitivity detection capability, and made it suitable for wearable health monitoring and smart writing boards.

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Abstract

This invention relates to a flexible hydrogel based on a cellulose framework, its preparation method, and its applications, belonging to the field of flexible hydrogel technology. To address the problems of low process efficiency, difficulty in controlling microstructure, and uneven performance in existing flexible wood-based hydrogel processes, this invention provides a method for preparing a flexible hydrogel based on a cellulose framework. Natural wood chips are deligated to obtain deligated wood chips, which are then treated with an alkali under a time gradient to obtain a cellulose framework. The cellulose framework is then vacuum-impregnated in a PAM precursor solution prepared from acrylamide monomer, a crosslinking agent, and an initiator. Finally, in-situ polymerization under ultraviolet light yields a flexible hydrogel based on the cellulose framework. This invention achieves precise control of the supramolecular structure of the cellulose framework through optimization of the alkali treatment time gradient, resulting in a cellulose framework that combines toughness and strength. The in-situ polymerization technology ensures the structural integrity and functional synergy of the ion-conducting hydrogel, broadening the application prospects of flexible hydrogels.
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