Process for the preparation of ionic electroactive artificial muscles based on dually modified microfibrillated cellulose

Abstract

The application belongs to the field of intelligent materials, and particularly relates to a preparation method of an ionic electroactive artificial muscle based on double modified microfibrillated cellulose and polyvinyl alcohol. The purpose is to provide a low-cost, high-performance and environmentally friendly preparation method of an ionic electroactive artificial muscle based on double modified microfibrillated cellulose and polyvinyl alcohol. The technical scheme is a preparation method of an ionic electroactive artificial muscle based on double modified microfibrillated cellulose, which comprises the following steps: 1) preparing a double modified microfibrillated cellulose dispersion liquid; 2) preparing a double modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol dispersion liquid; 3) preparing a double modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer film; and 4) preparing a double modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol ionic electroactive artificial muscle.

Description

Technical Field

[0001] This invention belongs to the field of smart materials, specifically relating to a method for preparing ionic electroactive artificial muscles based on dual-modified microfibrillated cellulose and polyvinyl alcohol. Background Technology

[0002] Smart materials belong to the forefront of modern science and technology and are rapidly developing into an important part of interdisciplinary research. Soft robots built based on smart materials and biomimetic design concepts are gradually becoming an important research direction in the field of robotics due to their high flexibility, lightweight, and excellent environmental adaptability. Among them, actuators made of flexible actuation materials serve as the core components for energy input and motion output, and their performance directly determines the movement mode and application potential of soft robots.

[0003] CN115651233A discloses a method for preparing an ion-type electroactive actuator based on carboxylated bacterial cellulose. This method uses TEMPO oxidation to oxidize the hydroxyl groups on the bacterial cellulose molecular chain to carboxyl groups. Due to the electrostatic repulsion between carboxylate ions, the cellulose is dispersed in water, thereby forming a loose and porous network structure that is conducive to ion transport and improving the driving performance.

[0004] However, since carboxylated bacterial cellulose has almost no electrochemical activity, this fundamentally limits the overall performance of actuators made from it as a substrate material. Currently, ion-type electroactive actuators prepared using this type of cellulose and its derivatives generally suffer from problems such as small bending displacement, poor cycle stability, and unsatisfactory electrochemical response, making it difficult to meet the requirements of high driving performance and reliable stability in practical applications. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a low-cost, high-performance, environmentally friendly method for preparing ionic electroactive artificial muscles based on dual-modified microfibrillated cellulose and polyvinyl alcohol.

[0006] To overcome the above-mentioned technical problems, the present invention adopts the following technical solution: The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose includes the following steps: 1) Preparation of dual-modified microfibrillated cellulose dispersion 1.1) Add an appropriate amount of deionized water to the microfibrillated cellulose and stir at room temperature for 3-5 h to prepare a uniform microfibrillated cellulose dispersion; 1.2) The microfibrillated cellulose was oxidized using the TEMPO oxidation method, and then centrifuged to obtain pure oxidized microfibrillated cellulose; 1.3) Add an appropriate amount of deionized water to oxidized microfibrillated cellulose and stir at room temperature for 3-5 h to prepare a uniform oxidized microfibrillated cellulose dispersion. 1.4) The oxidized microfibrillated cellulose in the oxidized microfibrillated cellulose dispersion was etherified and modified by (2,3-epoxypropyl)trimethylammonium chloride, and then centrifuged to obtain pure double-modified microfibrillated cellulose. 2) Preparation of a dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol dispersion Take a certain amount of double-modified microfibrillated cellulose, add ionic liquid (preferably 1-ethyl-3-methylimidazolium tetrafluoroborate), polyvinyl alcohol and an appropriate amount of deionized water in sequence, stir at room temperature for 3-5 h to obtain a uniform double-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol dispersion. 3) Preparation of dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer membrane The double-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol dispersion was placed in a vacuum chamber to remove air bubbles. After the air bubbles in the dispersion were removed, the dispersion was poured into a polytetrafluoroethylene mold and placed in a drying oven. After complete drying, a double-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer film was obtained. 4) Preparation of dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol ionic electroactive artificial muscle A PEDOT:PSS electrode solution was coated on both sides of the prepared dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer membrane using a coating method. After the electrode solution was fully adhered to both sides of the polymer membrane, it was placed in a cool and ventilated environment to dry naturally to form an electrode sheet, thus obtaining a dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol ionic electroactive artificial muscle.

[0007] The TEMPO oxidation process in step 1.2) is as follows: Sodium bromide and TEMPO are added to the diluted and well-stirred microfibrillated cellulose dispersion. The mixture is stirred at room temperature for 1.5-2.5 h until it is completely dissolved. Sodium hypochlorite solution is then added to the mixture to raise the pH to 11. The mixture is stirred continuously. The pH of the solution slowly decreases at the beginning of the reaction. When the pH drops to 10.5, sodium hydroxide solution is continuously titrated to maintain the pH at 10.5 ± 0.2 until the pH no longer changes. After the reaction is completed, dilute hydrochloric acid is added to adjust the pH to 7. The product is centrifuged (centrifuge speed 4000 rpm, centrifugation time 25 min), extracted, and washed with deionized water. The centrifugation-washing process is repeated 3 times to obtain pure oxidized microfibrillated cellulose.

[0008] The process of etherification modification using (2,3-epoxypropyl)trimethylammonium chloride in step 1.4) is as follows: sodium hydroxide solution and isopropanol are added to the diluted and uniformly stirred oxidized microfibrillated cellulose dispersion, and the mixture is stirred at 60 ℃ for 0.8-1.2 h to fully alkalize the oxidized microfibrillated cellulose; (2,3-epoxypropyl)trimethylammonium chloride is added to the mixed solution, and after the oxidized microfibrillated cellulose is completely dissolved, the mixture is reacted in an oil bath at 60 ℃ for 9-11 h; after the reaction is completed, the solution is allowed to stand and cool to room temperature, and the pH value is adjusted to 7 with dilute hydrochloric acid. The product is centrifuged (centrifuge speed is 4000 rpm, centrifugation time is 25 min), extracted, and washed with deionized water. After repeating centrifugation-washing 3 times, pure double-modified microfibrillated cellulose is obtained.

[0009] In step 1.2), the mass ratio of microfibrillated cellulose, sodium bromide, and TEMPO is 250:25:4; the mass fractions of the microfibrillated cellulose dispersion and sodium hypochlorite solution are 2 wt% and 10 wt%, respectively; and the concentrations of the sodium hydroxide solution and dilute hydrochloric acid solution are both 0.5 mol / L.

[0010] In step 1.4), the mass ratio of the oxidized microfibrillated cellulose dispersion, sodium hydroxide solution, and isopropanol used in the alkalization step is 5:5:1; the mass ratio of (2,3-epoxypropyl)trimethylammonium chloride added subsequently to the oxidized microfibrillated cellulose dispersion used is 1:5; the mass fraction of the oxidized microfibrillated cellulose dispersion is 2 wt%, and the concentrations of the sodium hydroxide solution and the dilute hydrochloric acid solution are both 0.5 mol / L.

[0011] In step 2), the mass ratio of the dual-modified microfibrillated cellulose dispersion, ionic liquid, and polyvinyl alcohol is 200:6:5; the mass fractions of the dual-modified microfibrillated cellulose dispersion and the polyvinyl alcohol solution are 2 wt% and 5 wt%, respectively.

[0012] Step 3) The bubble removal process in the vacuum chamber lasts for 8-12 minutes; the temperature of the drying chamber is set to 60 ℃, and the drying time is 12-18 hours.

[0013] Compared with the prior art, the present invention has the following advantages: 1. Microfibrillated cellulose is produced by degrading cellulose fibers into micron-sized cellulose fibers through physical or chemical methods. It possesses a high specific surface area, abundant surface hydroxyl groups, and excellent mechanical properties, enabling it to provide reliable structural support in flexible functional material systems and effectively control the macroscopic properties and stability of the materials. Furthermore, cellulose, as a typical representative of natural polymer materials, has advantages such as abundant reserves, excellent biocompatibility, and environmental friendliness. Therefore, this invention uses microfibrillated cellulose as a base material, which is low-cost and environmentally friendly.

[0014] 2. This invention employs TEMPO oxidation to oxidize microfibrillated cellulose. Microfibrillated cellulose exhibits strong surface hydrophobicity, poor compatibility with water-soluble materials, and insufficient flexibility. TEMPO oxidation modification selectively oxidizes the primary alcohol hydroxyl group at the C6 position of the cellulose molecular chain to a carboxyl group (–COOH). This process significantly improves the hydrophilicity and surface charge density of microfibrillated cellulose, thereby enhancing its compatibility with ionic liquids and water-soluble materials such as polyvinyl alcohol.

[0015] 3. This invention employs (2,3-epoxypropyl)trimethylammonium chloride to etherify oxidized microfibrillated cellulose. Etherification modification can introduce quaternary ammonium cationic groups ([NR3]) onto the cellulose surface. + This allows for the regulation of surface charge properties and chemical activity of materials, thereby enhancing the hygroscopicity and hydrophilicity of artificial muscles.

[0016] 4. The polyvinyl alcohol added in this invention is a water-soluble polymer with good solubility, hydrophilicity and biocompatibility. The abundant hydroxyl groups in its molecular chain can form a dense hydrogen bond network, thereby enhancing interfacial interactions and improving structural integrity and stability. As an electrolyte, the ionic liquid can improve the ionic conductivity and electrochemical stability of the material, and can also optimize the electroresponsive performance by adjusting the ion migration rate.

[0017] 5. The present invention uses PEDOT:PSS material as electrode material, which can maintain stable conductivity under repeated deformation conditions, and is particularly suitable for the construction of wearable devices and artificial muscle electrode layers.

[0018] 6. The preparation process of this invention does not involve high temperature and high pressure operating environments, and the preparation materials and chemical reagents used are all green, environmentally friendly, completely non-toxic.

[0019] 7. The present invention prepares an ionic electroactive polymer film, and the artificial muscle prepared using this film as a substrate material has the advantages of low driving voltage, large bending deformation, and good stability, which is beneficial for applications in wearable devices, flexible bionic robots, flexible sensing devices and other fields. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol artificial muscle (EMIM in the diagram). + and (These are two types of ions in an ionic liquid); Figure 2 This is the artificial muscle preparation process according to an embodiment of the present invention; Figure 3 This is an FT-IR chromatogram of the dual-modified microfibrillated cellulose of the present invention; Symbols in the diagram: MFC is microfibrillated cellulose; TMFC is oxidized microfibrillated cellulose; CMFC is etherified microfibrillated cellulose; ZMFC is double-modified microfibrillated cellulose; PVA is polyvinyl alcohol; 1 is PEDOT:PSS electrode sheet; 2 is double-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer membrane. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] like Figure 1 As shown, the ionic electroactive artificial muscle of the dual-modified microfibrillated cellulose of the present invention has a specific structure in which PEDOT:PSS electrode sheets 1 are respectively installed and fixed on the two surfaces of the dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer membrane 2. like Figure 2 As shown, this invention prepares an ion exchange membrane using dual-modified microfibrillated cellulose that has undergone oxidation and etherification sequentially, an ionic liquid, and polyvinyl alcohol. Subsequently, a PEDOT:PSSR flexible electrode liquid is coated onto both sides of the ion exchange membrane to form a flexible electrode layer, ultimately creating an artificial muscle. Example

[0023] The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose includes the following steps: 1) Preparation of dual-modified microfibrillated cellulose dispersion Take 100 g of a 2 wt% microfibrillated cellulose dispersion, add 400 ml of deionized water and stir at room temperature for 4 h to prepare a uniform microfibrillated cellulose dispersion. Microfibrillated cellulose (MFC) was oxidized using the TEMPO oxidation method: 0.2 g of sodium bromide and 0.032 g of TEMPO (2,2,6,6-tetramethylpiperidine-1-oxy radical) were added to a diluted and well-stirred MFC dispersion. The mixture was stirred at room temperature for 2 h until completely dissolved. Then, 10 wt% sodium hypochlorite solution was added to the dispersion to raise the pH to 11, and stirring was continued. The reaction was accompanied by a slow decrease in the pH of the solution. When the pH dropped to 10.5, 0.5 mol / L sodium hydroxide solution was continuously titrated to maintain the pH at around 10.5 until the pH no longer changed. After the reaction was completed, 0.5 mol / L dilute hydrochloric acid was added to adjust the pH to 7. The product was centrifuged (centrifuge speed 4000 rpm, centrifugation time 25 min), extracted, and washed with deionized water. The centrifugation-washing process was repeated 3 times to obtain pure oxidized microfibrillated cellulose (TMFC). Add 100g of deionized water to the prepared oxidized microfibrillated cellulose and stir at room temperature for 4 h to prepare a uniform oxidized microfibrillated cellulose dispersion with a mass fraction of 2 wt%. Etherification modification of oxidized microfibrillated cellulose was carried out using (2,3-epoxypropyl)trimethylammonium chloride: 100 g of 0.5 mol / L sodium hydroxide solution and 20 g of isopropanol were added to 100 g of the prepared oxidized microfibrillated cellulose dispersion, and the mixture was stirred at 60 ℃ for 1 h to fully alkalize the cellulose; 20 g of (2,3-epoxypropyl)trimethylammonium chloride was added to the mixed solution, and after complete dissolution, the mixture was reacted in an oil bath at 60 ℃ for 10 h; after the reaction, the solution was allowed to stand and cool to room temperature, and the pH was adjusted to 7 with 0.5 mol / L dilute hydrochloric acid. The product was centrifuged (centrifuge speed 4000 rpm, centrifugation time 25 min), extracted, and washed with deionized water. After repeating the centrifugation-washing process 3 times, pure double-modified microfibrillated cellulose was obtained. An appropriate amount of deionized water was added to the prepared double-modified microfibrillated cellulose and stirred at room temperature for 4 h to finally prepare a 2 wt% dispersion. 2) Preparation of a dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol dispersion Take 20 g of 2 wt% double-modified microfibrillated cellulose dispersion, add 0.6 g of ionic liquid, 0.5 g of 5 wt% polyvinyl alcohol solution and 40 g of deionized water in sequence, and stir at room temperature for 4 h to obtain a uniform carboxylated bacterial cellulose-ionic liquid-polyvinyl alcohol dispersion. 3) Preparation of a dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer membrane 2 The double-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol dispersion was placed in a vacuum chamber to remove air bubbles for 10 minutes. After the air bubbles in the dispersion were removed, the dispersion was poured into a polytetrafluoroethylene mold and placed in a drying oven to dry for 15 hours. The temperature of the drying oven was set to 60 °C. After complete drying, a double-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer film was obtained. 4) Preparation of dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol ionic electroactive artificial muscle A PEDOT:PSS electrode solution was coated on both sides of the prepared dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer membrane using a coating method. After the electrode solution was fully adhered to both sides of the polymer membrane, it was placed in a cool and ventilated environment to dry naturally, forming PEDOT:PSS electrode sheet 1. The dried film was then cut into a shape of 50mm×10mm, finally obtaining the dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol ionic electroactive artificial muscle.

[0024] The ionic liquids used in the preparation steps are all 1-ethyl-3-methylimidazolium tetrafluoroborate.

[0025] Performance testing FT-IR test The dual-modified microfibrillated cellulose obtained in the examples was subjected to FT-IR testing, i.e., Fourier transform infrared spectroscopy. This test was additionally performed on microfibrillated cellulose (MFC), oxidized microfibrillated cellulose (TMFC), and etherified microfibrillated cellulose (CMFC) for comparison. The test results are as follows: Figure 3 As shown. At 3328 cm -1 The broad peak at approximately 2892 cm⁻¹ corresponds to the stretching vibration of –OH in the cellulose molecule; the peak at approximately 2892 cm⁻¹ corresponds to the stretching vibration of –OH in the cellulose molecule. -1 The absorption peak at approximately 1023 cm⁻¹ is attributed to the stretching vibration of C–H; -1 The absorption peak at this point is related to the stretching vibration of the C–O–C bond, reflecting the typical structural characteristics of cellulose. After TEMPO oxidation, the oxidized microfibrillated cellulose shows an absorption peak at approximately 1604 cm⁻¹. -1 A distinct absorption peak appears at this point, which can be attributed to the carboxyl group –COO. - The stretching vibration of C=O in cellulose indicates that the primary alcohol hydroxyl group at C6 of the cellulose molecule is selectively oxidized to a carboxyl group, proving that TEMPO oxidation successfully introduced a charged functional group. The cationic cellulose obtained after etherification (etherified microfibrillated cellulose and doubly modified microfibrillated cellulose) exhibits a high osmotic pressure at 1477 cm⁻¹. -1A distinct absorption peak is observed at this point, which is the stretching vibration peak of the CN bond. This indicates that during the pretreatment process, some hydroxyl groups on the cellulose surface are replaced by quaternary ammonium salt groups, forming CN bonds in the molecular structure. This result demonstrates that the cationic etherifying agent successfully grafted cationic substances containing quaternary ammonium salt groups onto the cellulose surface via etherification, achieving successful amphoteric modification of cellulose.

[0026] The above description is merely a preferred embodiment of the present invention; however, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

Claims

1. A method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose, comprising the following steps: 1) Preparation of dual-modified microfibrillated cellulose dispersion Add an appropriate amount of deionized water to microfibrillated cellulose and stir at room temperature for 3-5 h to prepare a uniform microfibrillated cellulose dispersion. 1.2) The microfibrillated cellulose was oxidized using the TEMPO oxidation method, and then centrifuged to obtain pure oxidized microfibrillated cellulose; 1.3) Add an appropriate amount of deionized water to oxidized microfibrillated cellulose and stir at room temperature for 3-5 h to prepare a uniform oxidized microfibrillated cellulose dispersion. 1.4) The oxidized microfibrillated cellulose in the oxidized microfibrillated cellulose dispersion was etherified and modified by (2,3-epoxypropyl)trimethylammonium chloride, and then centrifuged to obtain pure double-modified microfibrillated cellulose. 2) Preparation of a dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol dispersion Take a certain amount of double-modified microfibrillated cellulose, add ionic liquid, polyvinyl alcohol and appropriate amount of deionized water in sequence, stir at room temperature for 3-5 h to obtain a uniform double-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol dispersion. 3) Preparation of dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer membrane The double-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol dispersion was placed in a vacuum box to remove air bubbles; after the air bubbles in the dispersion were removed, the dispersion was poured into a polytetrafluoroethylene mold and placed in a drying oven. After it was completely dried, a double-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer film was obtained (2). 4) Preparation of dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol ionic electroactive artificial muscle PEDOT:PSS electrode solution was coated on both sides of the prepared dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol polymer membrane by coating method. After the electrode solution was fully adhered to both sides of the polymer membrane, it was placed in a cool and ventilated environment to dry naturally to form PEDOT:PSS electrode sheet (1), thus obtaining dual-modified microfibrillated cellulose-ionic liquid-polyvinyl alcohol ionic electroactive artificial muscle.

2. The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose according to claim 1, characterized in that: The TEMPO oxidation process in step 1.2) is as follows: Sodium bromide and TEMPO are added to the diluted and well-stirred microfibrillated cellulose dispersion. The mixture is stirred at room temperature for 1.5-2.5 h until it is completely dissolved. Sodium hypochlorite solution is then added to the mixture to raise the pH to 11. The mixture is stirred continuously. The pH of the solution slowly decreases at the beginning of the reaction. When the pH drops to 10.5, sodium hydroxide solution is continuously titrated to maintain the pH at 10.5 ± 0.2 until the pH no longer changes. After the reaction is completed, dilute hydrochloric acid is added to adjust the pH to 7. The product is centrifuged, extracted, and washed with deionized water. The centrifugation-washing process is repeated 3 times to obtain pure oxidized microfibrillated cellulose.

3. The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose according to claim 2, characterized in that: The process of etherification modification using (2,3-epoxypropyl)trimethylammonium chloride in step 1.4) is as follows: sodium hydroxide solution and isopropanol are added to the diluted and uniformly stirred oxidized microfibrillated cellulose dispersion, and the mixture is stirred at 60 °C for 0.8-1.2 h to fully alkalize the oxidized microfibrillated cellulose; (2,3-epoxypropyl)trimethylammonium chloride is added to the mixed solution, and after the oxidized microfibrillated cellulose is completely dissolved, the mixture is reacted in an oil bath at 60 °C for 9-11 h; after the reaction is completed, the solution is allowed to stand and cool to room temperature, and the pH value is adjusted to 7 with dilute hydrochloric acid. The product is centrifuged, extracted, and washed with deionized water. After repeating the centrifugation-washing process 3 times, pure double-modified microfibrillated cellulose is obtained.

4. The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose according to claim 3, characterized in that: In step 1.2), the mass ratio of microfibrillated cellulose, sodium bromide, and TEMPO is 250:25:4; the mass fractions of the microfibrillated cellulose dispersion and sodium hypochlorite solution are 2 wt% and 10 wt%, respectively; and the concentrations of the sodium hydroxide solution and dilute hydrochloric acid solution are both 0.5 mol / L.

5. The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose according to claim 4, characterized in that: In step 1.4), the mass ratio of the oxidized microfibrillated cellulose dispersion, sodium hydroxide solution, and isopropanol used in the alkalization step is 5:5:1; the mass ratio of (2,3-epoxypropyl)trimethylammonium chloride added subsequently to the oxidized microfibrillated cellulose dispersion used is 1:5; the mass fraction of the oxidized microfibrillated cellulose dispersion is 2 wt%, and the concentrations of the sodium hydroxide solution and the dilute hydrochloric acid solution are both 0.5 mol / L.

6. The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose according to claim 5, characterized in that: The mass ratio of the dual-modified microfibrillated cellulose dispersion, ionic liquid, and polyvinyl alcohol in step 2) is 200:6:5; the mass fractions of the dual-modified microfibrillated cellulose dispersion and the polyvinyl alcohol solution are 2wt% and 5wt%, respectively.

7. The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose according to claim 6, characterized in that: Step 3) The bubble removal process in the vacuum chamber lasts for 8-12 minutes; the temperature of the drying chamber is set to 60 ℃, and the drying time is 12-18 h.

8. The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose according to claim 7, characterized in that: When centrifuging the product in step 1.2), the centrifuge speed is 4000 rpm and the centrifugation time is 25 min.

9. The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose according to claim 8, characterized in that: During the centrifugal extraction in step 1.4), the centrifuge speed is 4000 rpm and the centrifugation time is 25 min.

10. The method for preparing ionic electroactive artificial muscle based on dual-modified microfibrillated cellulose according to claim 9, characterized in that: The ionic liquid mentioned in step 2) is 1-ethyl-3-methylimidazolium tetrafluoroborate.

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