阅读说明：本技术 一种双网络结构的纤维素/paa阴离子交换膜的制备方法 (Preparation method of cellulose/PAA anion exchange membrane with double-network structure ) 是由 蔡小霞 张国涛 李聪 由翔 刘伟良 刘美丽 张又元 于 2020-12-04 设计创作，主要内容包括：本发明涉及一种双网络结构的纤维素/聚丙烯酸阴离子交换膜的制备方法。其制备步骤如下：首先以纤维素为原材料,通过氢氧化锂/尿素体系低温溶解形成纤维素溶液；然后浇注成膜,通过凝固浴凝固、再生,经超临界CO-2冷冻干燥获得三维网络结构的纤维素膜；丙烯酸(AA)单体在三维网络结构的纤维素膜中原位聚合得到双网络结构纤维素/聚丙烯酸阴离子交换膜,再通过浸泡碱性溶液,获得高电导率、适中机械性能的阴离子交换膜。本发明具有制备过程简单,流程耗时短,原料成本低,环境污染小等特点；制备得到的纤维素/聚丙烯酸阴离子交换膜具有形貌特殊、结构稳定、电化学性能和力学性能优异等优点,可应用于碱性电池。(The invention relates to a preparation method of a cellulose/polyacrylic acid anion exchange membrane with a double-network structure. The preparation method comprises the following steps: firstly, taking cellulose as a raw material, and dissolving the cellulose at a low temperature by using a lithium hydroxide/urea system to form a cellulose solution; then casting into film, coagulating in coagulating bath, regenerating, and treating with supercritical CO 2 Freeze drying to obtain cellulose membrane with three-dimensional network structure; acrylic Acid (AA) monomer is polymerized in situ in a cellulose membrane with a three-dimensional network structure to obtain a cellulose/polyacrylic acid anion exchange membrane with a double-network structure, and then the anion exchange membrane with high conductivity and moderate mechanical property is obtained by soaking in alkaline solution. The invention has the advantages of simple preparation process and short flow time consumptionThe raw material cost is low, the environmental pollution is small, and the like; the prepared cellulose/polyacrylic acid anion exchange membrane has the advantages of special appearance, stable structure, excellent electrochemical performance and mechanical performance and the like, and can be applied to alkaline batteries.)

1. A preparation method of a cellulose/PAA anion exchange membrane with a double-network structure is characterized by comprising the following steps:

(1) preparation of network structure cellulose membrane

Weighing a certain amount of lithium hydroxide and urea, dissolving in deionized water, soaking cellulose in the solution, and freezing at-12 deg.C for 4-48 h; unfreezing the frozen mixed solution to obtain a uniform and stable mixed solution; casting the mixed solution into a mold, placing the mold in a coagulating bath for 16-36h, and coagulating and regenerating to obtain a cellulose membrane; finally, the cellulose membrane is subjected to supercritical CO treatment in a reaction kettle₂Drying under 8-16MPa at 30-50 deg.C for 4-8h to obtain network structure cellulose membrane;

wherein the mass ratio of the lithium hydroxide to the urea to the deionized water is 4: 10: 86 to 7: 13: 80;

(2) preparation of cellulose/polyacrylic acid anion exchange membrane

Soaking the network structure cellulose membrane obtained in the step (1) in an Acrylic Acid (AA) monomer for 8-24h, adding a water-soluble peroxide initiator, and carrying out polymerization reaction at 60 ℃ for 2-8h to obtain a double-network structure cellulose/polyacrylic acid composite membrane; soaking the composite membrane in an alkaline solution with the concentration range of 4-10M for 1-5h to obtain a cellulose/PAA anion exchange membrane with a double-network structure;

wherein the mass ratio of the absorbent cotton cellulose to the PAA is 1: 99 to 10: 90.

2. the method of claim 1, wherein the cellulose in the step (1) comprises at least one of: absorbent cotton, filter pulp, cotton linter pulp and cellulose powder.

3. The method of claim 1, wherein the coagulation bath in step (1) comprises at least one of: absolute ethyl alcohol, methanol, acetone, isopropanol and tert-butyl alcohol.

4. The method of claim 1, wherein the water-soluble peroxide initiator in step (2) comprises at least one of: k₂S₂O₈、(NH₄)₂S₂O₈、Na₂S₂O₈。

5. The method of claim 1, wherein the alkaline solution in step (2) comprises at least one of: aqueous potassium hydroxide solution, aqueous sodium hydroxide solution, and aqueous lithium hydroxide solution.

6. The method for producing a cellulose/polyacrylic acid polymer electrolyte according to claim 1, wherein: the cellulose/PAA anion exchange membrane with the double-network structure prepared in the step (2) has the cellulose mass accounting for 1-10% of the mass of the PAA.

Technical Field

The invention belongs to the technical field of new energy electronic materials, and relates to a preparation method of a cellulose/PAA anion exchange membrane with a double-network structure.

Background

With the continuous development of electronic technology, the degree of informatization of people's lives is continuously improved, the use of portable electronic devices is more and more popular, and the portable electronic devices are continuously and rapidly developed towards miniaturization, lightweight, high-performance and function diversification, so that the development of novel chemical power sources or elements is an urgent need of people. Anion exchange membrane as one of the key parts of alkaline polyelectrolyte battery, which transfers OH on the shoulder^-Ions thus function to form a complete battery circuit while separating the cathode and the anode, and have the advantages of high conductivity at room temperature, light weight, low cost, no leakage, environmental protection, etc., and have been widely studied in recent years (Wang Z., Li Z., Chen N., Lu C., Wang F., Zhu H., Journal of Membrane Science, 2018, 564, 492 500; Nemadoust S., Najjar R., Bresser D., Passeri S., Carbohydr Polym, 2020, 240, 116339).

Currently, high molecular compounds used for anion exchange membranes are largely classified into aliphatic basic polyelectrolytes and aromatic basic polyelectrolytes. They are classified into two general categories, namely homogeneous membranes and heterogeneous doped membranes, according to the structure of the anion exchange membranes. The homogeneous membrane is a uniform and stable polyelectrolyte membrane formed by casting after monomers containing cations or capable of forming cationic groups are directly polymerized by solution polymerization, bulk polymerization and other modes. Because only contains matrix material and no other additive, the structure in the film is uniform and stable, and crystallization is easy to occur, thereby blocking OH^-Transport of ions results in low ionic conductivity. In addition, such homogeneous membranes exhibit very unstable properties under alkaline conditions and are therefore not of high use value in practical production processes. The heterogeneous doped film is prepared by uniformly mixing alkali metal salt or other inorganic filler with polymer matrix and casting to form film, and structurally, the film has a 'sea island' structureThe ionic conductivity and the mechanical strength of the membrane are improved, but the alkali metal salt or the inorganic filler has poor compatibility with the polymer, and can be separated out on the surface of the anionic membrane after long-term use, namely, the phenomenon of 'blooming' occurs; therefore, the development of alkaline anion exchange membranes with high ionic conductivity, moderate mechanical properties, excellent structural stability and green safety is still an important research direction in the battery field.

Ion conductivity is one of the most important properties of an anion exchange membrane, and the influence factors mainly comprise the water content of a system, the alkali solution concentration of the system and the crystallinity of a matrix conducting ions. In order to simultaneously improve the concentration and the water content of the alkali solution of the system and reduce the crystallinity of the matrix conducting ions, thereby improving the ionic conductivity, the invention designs a brand-new cellulose/PAA anion exchange membrane with a double-network structure. The method passes supercritical CO₂And (3) constructing a cellulose network, and carrying out in-situ polymerization on the AA monomer in the cellulose network to generate another network. Because the cellulose has high crystallinity and contains a large amount of intermolecular and intramolecular hydrogen bonds, the system has excellent alkali resistance and good mechanical property; furthermore, because the cellulose contains a large amount of hydroxyl, the cellulose has good water absorption and water retention characteristics, and the water content of the system can be improved. PAA as OH^-Ion transport supports having a backbone containing a plurality of carboxylic acid functional groups, basic cations (e.g., K)⁺、Na⁺Etc.) readily complex with the oxygen atom on the carboxylic acid; after voltage is applied, chain segment thermal motion is generated by the PAA long chain to promote the continuous complexation-decomplexing phenomenon between the basic cation and the carboxylic acid oxygen atom, so that the basic cation migrates along the main chain of the PAA. Due to OH^-In the presence of ions and basic cations, OH^-Ions will also move along the main chain of PAA, thereby enabling the material to obtain electrochemical properties. Two phases in the membrane respectively play their roles, so that the comprehensive performance of the anion exchange membrane is improved, and the anion exchange membrane can be applied to alkaline batteries.

Disclosure of Invention

The invention provides a preparation method of a cellulose/polyacrylic acid anion exchange membrane with a double-network structure, which comprises the following steps:

(1) preparation of network structure cellulose membrane

Weighing a certain amount of lithium hydroxide and urea, dissolving in deionized water, soaking cellulose in the solution, and freezing at-12 deg.C for 4-48 h; unfreezing the frozen mixed solution to obtain a uniform and stable mixed solution; casting the mixed solution into a mold, and placing the mold in a coagulating bath for coagulation and regeneration to obtain a cellulose membrane; finally, the cellulose membrane is subjected to supercritical CO treatment in a reaction kettle₂Drying to obtain a network structure cellulose membrane;

(2) preparation of cellulose/polyacrylic acid anion exchange membrane

Soaking the network structure cellulose membrane obtained in the step (1) in an Acrylic Acid (AA) monomer for 8-24h, adding a water-soluble peroxide initiator, and carrying out polymerization reaction at 60 ℃ to obtain the double-network structure cellulose/polyacrylic acid composite membrane. And soaking the composite membrane in an alkaline solution for 1-5h to obtain the cellulose/PAA anion exchange membrane with the double-network structure.

Wherein the mass ratio of the lithium hydroxide to the urea to the deionized water is 4: 10: 86 to 7: 13: 80;

the cellulose comprises at least one of the following: absorbent cotton, filter pulp, cotton linter pulp, cellulose powder;

the coagulation bath comprises at least one of the following: absolute ethyl alcohol, methanol, acetone, isopropanol, tert-butanol;

the alkaline solution comprises at least one of the following components: aqueous potassium hydroxide solution, aqueous sodium hydroxide solution, aqueous lithium hydroxide solution;

the water-soluble peroxide initiator comprises at least one of the following components: k₂S₂O₈、(NH₄)₂S₂O₈、Na₂S₂O₈；

The cellulose/PAA anion exchange membrane with the double-network structure has the cellulose mass accounting for 1-10% of the total mass of the cellulose/PAA.

The technical advantages of the invention are as follows:

(1) the invention firstly passes supercritical CO₂Preparing to obtain the cellulose membraneCellulose has high crystallinity, giving the film excellent alkali resistance, and good mechanical properties; cellulose contains a large amount of hydroxyl and intermolecular and intramolecular hydrogen bonds, so that the membrane has good water absorption and retention properties; the cellulose membrane with high specific surface area and porosity can store a large amount of water, becomes a pathway for ion transmission, and provides a necessary condition for high ionic conductivity. PAA generated by in-situ polymerization in the pore structure of cellulose can cause the migration of basic cations along the PAA main chain by the complexation-decomplexation between carboxylic acid oxygen atoms and basic cations, and the basic cations and OH^-The electrostatic interaction between ions can also cause OH^-With the migration, OH in the system is effectively conducted^-Ions, improving the conductivity of the system.

(2) The method has the characteristics of simple preparation process, short flow time, low raw material cost, environmental friendliness and the like.

Drawings

FIG. 1 is a scanning electron microscope image of a cellulose/polyacrylic acid anion exchange membrane prepared in example 5 of the present invention.

FIG. 2 is a scanning electron microscope image of the cellulose/polyacrylic acid anion exchange membrane prepared in example 8 of the present invention.

FIG. 3 is a graph of the conductivity of cellulose/polyacrylic acid anion exchange membranes prepared in all examples taken together.

Detailed Description

The present invention will be further described with reference to the following embodiments and drawings, but is not limited thereto. Meanwhile, the experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.

Example 1:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.1g of absorbent cotton in the solution, freezing in a refrigerator at-12 ℃ for 4 hours, and thawing to obtain a uniform and stable mixed solution; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in an absolute ethyl alcohol coagulating bath for 24 hours to obtain a regenerated absorbent cotton film; putting the obtained absorbent cotton film into a reaction kettleCarrying out supercritical CO₂Drying under the condition of 12MPa at 40 ℃ for 4h to finally obtain the absorbent cotton cellulose membrane with the network structure.

Soaking the web structure absorbent cotton cellulose membrane in 5ml of acrylic acid monomer for 8h, and then adding 0.015, 0.015g K₂S₂O₈Uniformly mixing, placing in a vacuum drying oven at 60 ℃ to initiate polymerization for 2h to obtain the cellulose/polyacrylic acid composite membrane with the double-network structure; and soaking the composite membrane in 4M KOH solution for 1h to obtain the cellulose/PAA anion exchange membrane with the double-network structure.

Example 2:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.2g of cellulose powder in the solution, freezing in a refrigerator at the temperature of-12 ℃ for 12 hours, and unfreezing to obtain a uniform and stable mixed solution; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in an acetone coagulating bath for 24 hours to obtain a regenerated cellulose membrane; subjecting the obtained cellulose membrane to supercritical CO treatment in a reaction kettle₂Drying under the condition of 12MPa at 40 ℃ for 4h to finally obtain the cellulose membrane with the network structure.

Soaking the network structure cellulose membrane in 8ml of acrylic acid monomer for 12h, and then adding 0.015g (NH)₄)₂S₂O₈Uniformly mixing, placing in a vacuum drying oven at 60 ℃ to initiate polymerization for 2h to obtain the cellulose/polyacrylic acid composite membrane with the double-network structure; and soaking the composite membrane in 4M LiOH solution for 3h to obtain the cellulose/PAA anion exchange membrane with the double-network structure.

Example 3:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.6g of filter pulp in the solution, freezing in a refrigerator at the temperature of-12 ℃ for 12 hours, and unfreezing to obtain a uniform and stable mixed solution; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in a tert-butyl alcohol coagulating bath for 24 hours to obtain a regenerated filter pulp cellulose membrane; subjecting the obtained cellulose membrane to supercritical CO treatment in a reaction kettle₂Drying under the condition of 12MPa at 40 ℃ for 4h to finally obtain the cellulose membrane with the network structure.

Connecting netSoaking the complex structure cellulose membrane in 10ml of acrylic acid monomer for 12h, and adding 0.015g of Na₂S₂O₈Uniformly mixing, placing in a vacuum drying oven at 60 ℃ to initiate polymerization for 2h to obtain the cellulose/polyacrylic acid composite membrane with the double-network structure; and soaking the composite membrane in 4M NaOH solution for 5h to obtain the cellulose/PAA anion exchange membrane with the double-network structure.

Example 4:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.1g of absorbent cotton in the solution, freezing in a refrigerator at-12 ℃ for 24 hours, and thawing to obtain a uniform and stable mixed solution; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in an absolute ethyl alcohol coagulating bath for 24 hours to obtain a regenerated absorbent cotton film; subjecting the obtained absorbent cotton film to supercritical CO treatment in a reaction kettle₂Drying under the condition of 16MPa at 35 ℃ for 6h to finally obtain the absorbent cotton cellulose membrane with the network structure.

Soaking the web structure absorbent cotton cellulose membrane in 5ml of acrylic acid monomer for 16h, and then adding 0.015g K₂S₂O₈Uniformly mixing, placing in a vacuum drying oven at 60 ℃ to initiate polymerization for 4h to obtain the cellulose/polyacrylic acid composite membrane with the double-network structure; and soaking the composite membrane in 8M KOH solution for 1h to obtain the cellulose/PAA anion exchange membrane with the double-network structure.

Example 5:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.2g of absorbent cotton in the solution, freezing in a refrigerator at-12 ℃ for 24 hours, and thawing to obtain a uniform and stable mixed solution; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in an acetone coagulating bath for 24 hours to obtain a regenerated absorbent cotton cellulose membrane; subjecting the obtained cellulose membrane to supercritical CO treatment in a reaction kettle₂Drying under the condition of 16MPa at 35 ℃ for 6h to finally obtain the cellulose membrane with the network structure.

Soaking the network structure cellulose membrane in 8ml of acrylic acid monomer for 16h, and then adding 0.015g (NH)₄)₂S₂O₈Mixing, vacuum drying at 60 deg.CInitiating polymerization for 4h in the box to obtain a cellulose/polyacrylic acid composite membrane with a double-network structure; and soaking the composite membrane in 8M KOH solution for 3h to obtain the cellulose/PAA anion exchange membrane with the double-network structure.

The scanning electron microscope image of the cellulose/polyacrylic acid polymer electrolyte prepared in this example is shown in fig. 1, and it can be known from fig. 1 that the electrolyte polymer has a certain pore structure and has good water retention performance.

Example 6:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.6g of filter pulp in the solution, freezing in a refrigerator at the temperature of-12 ℃ for 24 hours, and unfreezing to obtain a uniform and stable mixed solution; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in a tert-butyl alcohol coagulating bath for 24 hours to obtain a regenerated filter pulp cellulose membrane; subjecting the obtained cellulose membrane to supercritical CO treatment in a reaction kettle₂Drying under the condition of 16MPa at 35 ℃ for 6h to finally obtain the cellulose membrane with the network structure.

Soaking the network structure cellulose membrane in 8ml of acrylic acid monomer for 16h, and then adding 0.015g of Na₂S₂O₈Uniformly mixing, placing in a vacuum drying oven at 60 ℃ to initiate polymerization for 4h to obtain the cellulose/polyacrylic acid composite membrane with the double-network structure; and soaking the composite membrane in 8M KOH solution for 5h to obtain the cellulose/PAA anion exchange membrane with the double-network structure.

Example 7:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.1g of absorbent cotton in the solution, freezing in a refrigerator at-12 ℃ for 48 hours, and thawing to obtain a uniform and stable mixed solution; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in an absolute ethyl alcohol coagulating bath for 24 hours to obtain a regenerated absorbent cotton film; subjecting the obtained absorbent cotton film to supercritical CO treatment in a reaction kettle₂Drying under the condition of 8MPa at 50 ℃ for 8h to finally obtain the absorbent cotton cellulose membrane with the network structure.

Soaking the network structure absorbent cotton cellulose membrane in 6ml of acrylic acid monomer for 24h, and then adding 0.015g K₂S₂O₈Uniformly mixing, placing in a vacuum drying oven at 60 ℃ to initiate polymerization for 6 hours to obtain a cellulose/polyacrylic acid composite membrane with a double-network structure; and soaking the composite membrane in 10M KOH solution for 1h to obtain the cellulose/PAA anion exchange membrane with the double-network structure.

Example 8:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.2g of absorbent cotton in the solution, freezing in a refrigerator at-12 ℃ for 48 hours, and thawing to obtain a uniform and stable mixed solution; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in an acetone coagulating bath for 24 hours to obtain a regenerated absorbent cotton cellulose membrane; subjecting the obtained cellulose membrane to supercritical CO treatment in a reaction kettle₂Drying under the condition of 8MPa at 50 ℃ for 8h to finally obtain the cellulose membrane with the network structure.

Soaking the network structure cellulose membrane in 8ml of acrylic acid monomer for 24h, and then adding 0.015g (NH)₄)₂S₂O₈Uniformly mixing, placing in a vacuum drying oven at 60 ℃ to initiate polymerization for 6 hours to obtain a cellulose/polyacrylic acid composite membrane with a double-network structure; and soaking the composite membrane in 10M KOH solution for 3h to obtain the cellulose/PAA anion exchange membrane with the double-network structure.

The scanning electron micrograph of the cellulose/polyacrylic acid polymer electrolyte prepared in this example is shown in fig. 2, and it can be seen from fig. 2 that the cellulose with a network structure is wrapped by polyacrylic acid to form co-continuous two phases, so that more OH groups can be generated^-The ions are transported in the pores, which facilitates further improvement of the conductivity.

Example 9:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.6g of filter pulp in the solution, freezing in a refrigerator at the temperature of-12 ℃ for 48 hours, and unfreezing to obtain a uniform and stable mixed solution; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in a tert-butyl alcohol coagulating bath for 24 hours to obtain a regenerated filter pulp cellulose membrane; subjecting the obtained cellulose membrane to supercritical CO treatment in a reaction kettle₂Drying under 10MPa at 50 deg.C for 8h to obtain cellulose membrane with network structure。

Soaking the network structure cellulose membrane in 8ml of acrylic acid monomer for 24h, and then adding 0.015g of Na₂S₂O₈Uniformly mixing, placing in a vacuum drying oven at 60 ℃ to initiate polymerization for 6 hours to obtain a cellulose/polyacrylic acid composite membrane with a double-network structure; soaking the composite membrane in 10M KOH solution for 5h to obtain the cellulose/PAA anion exchange membrane with a double-network structure

Comparative example 1:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.1g of absorbent cotton in the solution, and freezing in a refrigerator at the temperature of-12 ℃ for 24 hours; obtaining uniform and stable mixed solution after unfreezing; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in an absolute ethyl alcohol coagulating bath for 24 hours to obtain a regenerated absorbent cotton cellulose membrane; subjecting the obtained cellulose membrane to supercritical CO treatment in a reaction kettle₂Drying under the condition of 12MPa at 40 ℃ for 4h to finally obtain the cellulose membrane with the network structure.

And soaking the network structure cellulose membrane in 10M KOH solution for 1h to obtain the cellulose polymer anion exchange membrane.

Comparative example 2:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.2g of absorbent cotton in the solution, and freezing in a refrigerator at the temperature of-12 ℃ for 24 hours; obtaining uniform and stable mixed solution after unfreezing; casting the mixed solution into a polytetrafluoroethylene mold, and soaking in an acetone coagulating bath for 24 hours to obtain a regenerated absorbent cotton cellulose membrane; subjecting the obtained cellulose membrane to supercritical CO treatment in a reaction kettle₂Drying under the condition of 16MPa at 35 ℃ for 6h to finally obtain the cellulose membrane with the network structure.

And soaking the network structure cellulose membrane in 10M KOH solution for 3h to obtain the cellulose polymer anion exchange membrane.

Comparative example 3:

weighing 1.38g of lithium hydroxide and 4.5g of urea, dissolving in 24.12g of deionized water, soaking 0.6g of absorbent cotton in the solution, and freezing in a refrigerator at the temperature of-12 ℃ for 24 hours; obtaining uniform and stable mixed solution after unfreezing; then the mixed solution is cast toSoaking the polytetrafluoroethylene mold in a tert-butyl alcohol coagulating bath for 24 hours to obtain a regenerated absorbent cotton cellulose membrane; subjecting the obtained cellulose membrane to supercritical CO treatment in a reaction kettle₂Drying under the condition of 8MPa at 50 ℃ for 8h to finally obtain the cellulose membrane with the network structure.

And soaking the network structure cellulose membrane in 10M KOH solution for 5h to obtain the cellulose polymer anion exchange membrane.

The conductivity of all the cellulose/polyacrylic acid anion exchange membranes prepared in the examples is shown in FIG. 3. As shown in fig. 3, the cellulose/polyacrylic acid anion exchange membrane with a double-network structure obtained by in-situ polymerization of AA in a cellulose membrane has significantly increased ion conductivity compared to a simple cellulose membrane.