Multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane and preparation method thereof

Abstract

This invention discloses a multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane and its preparation method, belonging to the field of functional polymer materials technology. Single-layer or few-layer MXene nanosheets are obtained through in-situ HF etching, thereby preparing MXene dispersions of different concentrations. Coaxial electrospinning is then performed with MXene as the core and EVA as the shell to obtain a smart wearable MXene@EVA coaxial nanofiber membrane that integrates excellent breathability, ultra-high electromagnetic shielding effectiveness, and superior shape memory properties, greatly overcoming the shortcomings of traditional electromagnetic protective clothing.

Description

Technical Field

[0001] This invention belongs to the field of functional polymer materials technology, specifically relating to a multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane and its preparation method. Background Technology

[0002] In today's rapidly developing information technology landscape, smart and portable devices have become an indispensable part of people's daily lives. However, with the increasing prevalence and frequency of use of these devices, people's concerns about electromagnetic radiation are also growing.

[0003] Electromagnetic radiation refers to the energy released when electromagnetic waves propagate through space, originating from various electronic and communication devices. Although the scientific community has not yet reached a consensus on the effects of electromagnetic radiation, a growing body of research suggests that prolonged exposure to strong electromagnetic fields may pose certain health risks to humans.

[0004] The dangers of electromagnetic radiation are particularly serious for pregnant women. Studies have shown that exposure to electromagnetic radiation during pregnancy can lead to fetal developmental problems and increase the risk of premature birth, low birth weight, and childhood leukemia. Therefore, finding an effective method to shield against electromagnetic radiation is crucial for the protection of both pregnant women and their fetuses.

[0005] To address this issue, researchers have begun developing smart wearable protective clothing with electromagnetic radiation shielding capabilities. Currently, while a range of electromagnetic radiation protective clothing for pregnant women has emerged on the market, they all suffer from drawbacks, primarily poor wearing comfort and low overall electromagnetic shielding effectiveness. Firstly, smart wearable clothing must be made of fibers. While EVA material possesses excellent shape memory properties, it is rarely processed into fibers using other technologies; the vast majority of the result is bulk EVA films. MXene-based electromagnetic shielding composites offer good electromagnetic shielding capabilities, but they are prone to oxidation and corrosion. Furthermore, directly loading MXene onto fiber membranes through post-processing severely affects the membrane's porosity, leading to discomfort for wearers.

[0006] Therefore, how to combine MXene material with electromagnetic shielding function with EVA material with shape memory properties to prepare multifunctional smart protective clothing is a technical problem that urgently needs to be solved for the intelligent and advanced development of electromagnetic protective clothing for pregnant women. Summary of the Invention

[0007] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0008] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0009] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a method for preparing a multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane.

[0010] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including,

[0011] A few-layer MXene dispersion with a concentration of 5–15 wt% was prepared using N,N-dimethylformamide as a solvent;

[0012] Ethylene-vinyl acetate copolymer, benzophenone and triallyl isocyanurate were added sequentially to a mixed solvent of toluene and DMF to prepare an EVA spinning solution with a concentration of 8-12 wt%.

[0013] Coaxial electrospinning was performed using a few-layer MXene dispersion as the inner layer solution and EVA spinning solution as the outer layer solution. After spinning, the mixture was then subjected to natural drying and UV curing to obtain a multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane.

[0014] In a preferred embodiment of the preparation method of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of the present invention, anhydrous ethanol is selected as the intercalating agent in the preparation of the few-layer MXene dispersion.

[0015] In a preferred embodiment of the preparation method of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of the present invention, the mass ratio of the ethylene-vinyl acetate copolymer, benzophenone and triallyl isocyanurate is 100:2 to 3:1.

[0016] In a preferred embodiment of the preparation method of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of the present invention, the mass ratio of toluene to DMF is 7:2 to 4.

[0017] As a preferred embodiment of the preparation method of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of the present invention, wherein: in the coaxial electrospinning, the propulsion speed of the inner layer solution is 0.9-1.1 ml / h, and the propulsion speed of the outer layer solution is 1.5-2.0 ml / h.

[0018] As a preferred embodiment of the preparation method of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of the present invention, the coaxial electrospinning time is 6-8 hours, the spinning environment temperature is 40-60°C, and the spinning environment humidity is 25%-45%.

[0019] In a preferred embodiment of the preparation method of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of the present invention, the rotation speed of the collecting roller of the coaxial electrospinning is 150-300 rpm.

[0020] In a preferred embodiment of the preparation method of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of the present invention, the natural drying time is 18-24 hours.

[0021] In a preferred embodiment of the preparation method of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of the present invention, the ultraviolet curing time is 1-1.5 h and the ultraviolet wavelength is 300-450 nm.

[0022] The purpose of this invention is to provide a multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane.

[0023] Beneficial effects of this invention:

[0024] This invention cleverly combines MXene and EVA through a unique structural design and a one-step process. The resulting MXene@EVA coaxial nanofiber membrane exhibits excellent breathability, superior electromagnetic shielding effectiveness, and outstanding shape memory properties. Specifically, the MXene@EVA coaxial nanofiber membrane has relatively large fiber gaps, resulting in excellent breathability and improved wearing comfort. Furthermore, MXene's extremely high electrical conductivity endows the MXene@EVA coaxial nanofiber membrane with exceptional electromagnetic shielding effectiveness. On the other hand, the MXene@EVA coaxial nanofiber membrane can freely deform under heat stimulation to adapt to the changing body size of pregnant women at different stages, saving costs, allowing for reusability, and maintaining stable high electromagnetic shielding effectiveness. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0026] Figure 1 This is a schematic diagram illustrating the preparation method of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of the present invention.

[0027] Figure 2 This diagram illustrates the electromagnetic shielding effectiveness of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane during the shape memory process.

[0028] Figure 3 This is a diagram illustrating the EMI shielding mechanism of the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane of this invention. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the examples in the specification.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0032] Unless otherwise specified, all raw materials used in this invention are commercially available in the art, including ethylene-vinyl acetate copolymer: 25wt% vinyl acetate, melt index 19g / 10min.

[0033] Performance testing methods

[0034] Electromagnetic shielding effectiveness:

[0035] The electromagnetic shielding effectiveness of the initial MXene@EVA coaxial nanofiber membrane was tested and recorded.

[0036] The initial sample was subjected to a series of operations, including placing it on an 80°C heating table, stretching the sample, turning off the heating table, and removing the external force, to obtain a deformed sample. Its electromagnetic shielding effectiveness was then tested and recorded.

[0037] Under stress-free conditions, a recovered sample can be obtained by reapplying a high temperature of 80°C to the deformed sample, and its electromagnetic shielding effectiveness can be tested and recorded.

[0038] Shape memory function:

[0039] The shape memory properties of the MXene@EVA coaxial nanofiber membrane were confirmed using the TMA mode of a dynamic thermomechanical analyzer.

[0040] First, a rectangular fiber membrane with dimensions of 40×10×0.1mm was stretched from L0 to L1 at a rate of 0.02MPa / min at the programmed temperature; then, the deformed fiber membrane was cooled to a fixed temperature at a rate of 2℃ / min, and then the stress applied to the sample was removed. At this point, its length was recorded as L2. After 4 min, the cooled fiber membrane was heated to the programmed temperature at a rate of 5℃ / min, and its length returned to L3.

[0041] Repeat all steps three times and record the data.

[0042] Breathability:

[0043] The MXene@EVA coaxial nanofiber membrane was tested for air permeability using an air permeability tester.

[0044] The fiber membrane was laid flat and fixed at the vent, with a test area of ​​20cm². 2 The pressure drop was 200 Pa. After stabilization, the data was read.

[0045] Example 1

[0046] Reference Figure 1 The flowchart illustrates a preparation method provided in this embodiment, specifically as follows:

[0047] 1) Preparation of few-layer MXene dispersion:

[0048] 40 ml of (9M) hydrochloric acid was placed in a polytetrafluoroethylene beaker, 2 g of lithium fluoride was added, and the mixture was magnetically stirred for 30 min to obtain an in-situ generated hydrofluoric acid solution.

[0049] 2g of Ti3AlC2 was added to a hydrofluoric acid solution and magnetically stirred at 35°C for 24h. The Al layer in Ti3AlC2 was etched away by hydrofluoric acid to obtain a multilayer MXene dispersion containing strong acid.

[0050] The dispersion was evenly divided into four 50ml centrifuge tubes, centrifuged at 3500rpm for 10min, the strong acid solution was poured out, and then 40ml of deionized water was added and the mixture was centrifuged repeatedly until the pH of the poured out solution was 5.

[0051] Add 40 ml of anhydrous ethanol (intercalating agent) to each of the four centrifuge tubes, sonicate for 1 h, centrifuge at 10000 rpm for 10 min, collect the lower precipitate, and obtain the centrifuged precipitate.

[0052] Add 20 ml of deionized water to the centrifuged precipitate, shake well, sonicate for 20 min, then centrifuge at 3500 rpm for 3 min, collect the black upper liquid, repeat the process of adding deionized water to the precipitate and centrifuging and collecting multiple times to obtain a small layer of MXene dispersion.

[0053] The few-layer MXene dispersion was placed in a freezer for 12 hours and then freeze-dried in a freeze dryer. After being removed, it was stored in a sealed refrigerator.

[0054] 2) Prepare the spinning solution:

[0055] A few-layer MXene dispersion was prepared into an MXene dispersion with a concentration of 10 wt% using N,N-dimethylformamide (DMF) as the solvent, to obtain the inner layer solution for coaxial electrospinning;

[0056] Ethylene-vinyl acetate copolymer (EVA), benzophenone (BP) and triallyl isocyanurate (TAIC) were added in a 100:3:1 ratio to a mixed solvent of toluene and DMF in a 7:3 ratio to prepare an EVA spinning solution with a concentration of 10 wt%, thus obtaining the outer layer solution for coaxial electrospinning.

[0057] 3) Perform coaxial electrospinning:

[0058] Coaxial electrospinning was performed using the inner and outer layer solutions obtained from coaxial electrospinning as spinning solutions. The inner layer solution was propelled at a rate of 1 ml / h, the outer layer solution at a rate of 2 ml / h, and the spinning time was 6 h. After spinning, the solution was allowed to air dry for 24 h and then cured in an ultraviolet curing machine for 1 h to obtain a highly cross-linked, multifunctional, flexible wearable MXene@EVA coaxial nanofiber membrane.

[0059] Figure 2 This is a diagram showing the electromagnetic shielding effectiveness of the MXene@EVA coaxial nanofiber membrane prepared in this embodiment during the shape memory process. Figure 2It can be seen that the original MXene@EVA fiber membrane possesses extremely high electromagnetic shielding effectiveness, reaching approximately 75 dB. Subsequently, by utilizing shape memory properties to temporarily fix the fiber membrane's shape, when the fiber membrane is stretched to 10%, the electromagnetic shielding effectiveness drops to approximately 60 dB, still far exceeding the commercially acceptable 20 dB. Finally, by heating, the fiber membrane is restored to its original shape, at which point the electromagnetic shielding effectiveness is approximately 72 dB, close to the original value. Through ingenious structural design, the electromagnetic shielding effectiveness of the MXene@EVA fiber membrane can be reversibly controlled using shape memory properties.

[0060] Example 2

[0061] The difference between this embodiment and Example 1 is that the concentrations of MXene dispersion and EVA spinning solution in step 2) are adjusted to 5wt% and 8wt% respectively, while the remaining steps are the same as in Example 1, to obtain the MXene@EVA coaxial nanofiber membrane of this embodiment.

[0062] Example 3

[0063] The difference between this embodiment and Example 1 is that the concentrations of MXene dispersion and EVA spinning solution in step 2) are adjusted to 15wt% and 12wt% respectively. The remaining steps are the same as in Example 1, and the MXene@EVA coaxial nanofiber membrane of this embodiment is obtained.

[0064] The electromagnetic shielding performance, shape memory function, and air permeability of the fiber membranes prepared in Examples 1 to 3 were measured, and the results are shown in Table 1.

[0065] Table 1

[0066]

[0067] (Note: Rf = shape fixation rate, Rr = shape recovery rate)

[0068] As can be seen from Table 1, the fiber membrane prepared by this invention has good electromagnetic shielding performance, shape memory function, and air permeability. Figure 3Its electromagnetic shielding mechanism involves the following: when electromagnetic waves radiate onto the surface of the fiber membrane, due to the impedance mismatch between the fiber membrane and the air, a portion of the electromagnetic waves is reflected back into the external environment, while the remaining electromagnetic waves enter the interior of the fiber membrane. Some of these waves are absorbed due to dielectric loss, while others are dissipated through multiple reflections between the fibers. Ultimately, only a very small number of electromagnetic waves can pass through the fiber membrane, thus achieving excellent electromagnetic shielding performance. The unique core-shell structure design of the MXene@EVA coaxial nanofiber membrane cleverly combines the shape memory properties of the outer EVA layer with the electromagnetic shielding performance of the inner MXene layer. Furthermore, the outer EVA layer effectively protects the inner MXene layer, solving the problems of easy oxidation and corrosion in current MXene-based electromagnetic shielding composite materials and greatly improving the durability of protective clothing.

[0069] Comparative Example 1

[0070] The difference between this comparative example and Example 1 is that the type of intercalating agent was changed to dimethyl sulfoxide (DMSO), while the rest of the preparation process was the same as in Example 1, resulting in the fiber membrane of this comparative example.

[0071] Comparative Example 2

[0072] The difference between this comparative example and Example 1 is that the type of intercalating agent was changed to tetrabutylammonium hydroxide (TBAOH), while the rest of the preparation process was the same as in Example 1, resulting in the fiber membrane of this comparative example.

[0073] The electromagnetic shielding performance, shape memory function, and air permeability of the fiber membranes prepared in Comparative Examples 1 and 2 were measured and compared with those in Example 1. The results are shown in Table 2.

[0074] Table 2

[0075]

[0076] (Note: Rf = shape fixation rate, Rr = shape recovery rate)

[0077] As can be seen from Table 2, the electromagnetic shielding performance of the fiber membranes prepared in Comparative Examples 1 and 2 is significantly lower than that in Example 1. This is because adjusting the type of intercalating agent affects the conductivity of the prepared MXene nanosheets. The study found that using anhydrous ethanol as an intercalating agent is significantly better than using dimethyl sulfoxide and tetrabutylammonium hydroxide as intercalating agents. The MXene nanosheets obtained after ultrasonic intercalation have a larger interlayer spacing and are less prone to stacking, which greatly improves conductivity and thus achieves excellent electromagnetic shielding performance.

[0078] Comparative Example 3

[0079] The difference between this comparative example and Example 1 is that the solute ratio of the EVA spinning solution was adjusted to 100:1:1 (EVA:BP:TAIC), while the rest of the preparation process was the same as in Example 1, resulting in the fiber membrane of this comparative example.

[0080] Comparative Example 4

[0081] The difference between this comparative example and Example 1 is that the solute ratio of the EVA spinning solution was adjusted to 100:4:1 (EVA:BP:TAIC), while the rest of the preparation process was the same as in Example 1, resulting in the fiber membrane of this comparative example.

[0082] The electromagnetic shielding performance, shape memory function, and air permeability of the fiber membranes prepared in Comparative Examples 3 and 4 were measured and compared with those in Example 1. The results are shown in Table 3.

[0083] Table 3

[0084]

[0085] (Note: Rf = shape fixation rate, Rr = shape recovery rate)

[0086] As can be seen from Table 3, the electromagnetic shielding performance and shape memory function of the fiber membranes prepared in Comparative Examples 3 and 4 are significantly reduced compared with those in Example 1. This is because adjusting the solute ratio of the EVA spinning solution will affect the degree of entanglement of the EVA molecular chains. Excessive or insufficient entanglement of the molecular chains will affect the degree of cross-linking of the EVA fiber membrane, thereby further affecting its shape memory function. When the solute ratio of the EVA spinning solution is 100:3:1 (EVA:BP:TAIC), the coaxial nanofiber membrane has extremely high electromagnetic shielding effectiveness and shape memory function. In addition, the fiber membrane also has excellent air permeability.

[0087] Comparative Example 5

[0088] The difference between this comparative example and Example 1 is that the solvent ratio of the EVA spinning solution was adjusted to 6:4 (toluene:DMF), while the rest of the preparation process was the same as in Example 1, resulting in the fiber membrane of this comparative example.

[0089] Comparative Example 6

[0090] The difference between this comparative example and Example 1 is that the solvent ratio of the EVA spinning solution was adjusted to 8:2 (toluene:DMF), while the rest of the preparation process was the same as in Example 1, resulting in the fiber membrane of this comparative example.

[0091] The electromagnetic shielding performance, shape memory function, and air permeability of the fiber membranes prepared in Comparative Examples 5 and 6 were measured and compared with those in Example 1. The results are shown in Table 4.

[0092] Table 4

[0093]

[0094] (Note: Rf = shape fixation rate, Rr = shape recovery rate)

[0095] As can be seen from Table 4, the electromagnetic shielding performance and shape memory function of the fiber membranes prepared in Comparative Examples 5 and 6 are significantly reduced compared with those in Example 1. This is because adjusting the solvent ratio of the EVA spinning solution will affect the spinning process. When the toluene content in the solvent is too low, the EVA particles are difficult to completely dissolve, which is not conducive to smooth spinning. When the toluene content in the solvent is too high, the solvent is difficult to evaporate during the spinning process, which can easily lead to spinning interruption and reduced fiber continuity. Therefore, the prepared coaxial nanofiber membrane has certain defects, which will ultimately lead to a significant reduction in the electromagnetic shielding performance and shape memory function of the prepared fiber membrane.

[0096] Comparative Example 7

[0097] The difference between this comparative example and Example 1 is that the inner layer solution propulsion rate of the coaxial electrospinning was adjusted to 0.8 ml / h, and the outer layer solution propulsion rate was 1.6 ml / h. The rest of the preparation process was the same as in Example 1, and the fiber membrane of this comparative example was obtained.

[0098] Comparative Example 8

[0099] The difference between this comparative example and Example 1 is that the inner layer solution propulsion rate of the coaxial electrospinning was adjusted to 1.2 ml / h, and the outer layer solution propulsion rate was 2.4 ml / h. The rest of the preparation process was the same as in Example 1, and the fiber membrane of this comparative example was obtained.

[0100] The electromagnetic shielding performance, shape memory function, and air permeability of the fiber membranes prepared in Comparative Examples 7 and 8 were measured and compared with those in Example 1. The results are shown in Table 5.

[0101] Table 5

[0102]

[0103] (Note: Rf = shape fixation rate, Rr = shape recovery rate)

[0104] As can be seen from Table 5, the electromagnetic shielding performance and shape memory function of the fiber membranes prepared in Comparative Examples 7 and 8 are significantly reduced compared with those in Example 1. This is because adjusting the propulsion rate of the inner and outer solutions in coaxial electrospinning affects the fiber forming effect. If the propulsion rate is too slow, the Taylor cone formed at the needle tip will be unstable and cannot be seen inside the needle tip. If the propulsion rate is too fast, the Taylor cone will jump, thus forming beaded nanofibers. Therefore, adjusting the propulsion rate to a suitable ratio will help to obtain fibers with better forming effect, thereby further improving the electromagnetic shielding performance and shape memory function of the coaxial nanofiber membrane.

[0105] In summary, this invention obtains monolayer or few-layer MXene nanosheets through in-situ HF etching, thereby preparing MXene dispersions of different concentrations. Coaxial electrospinning is then performed using MXene as the core and EVA as the shell. First, Ti3AlC2 is placed in a mixed solution of LiF and HCl at 35°C and magnetically stirred for 24 hours. The resulting dispersion is centrifuged and repeatedly used for acid washing. Anhydrous ethanol is then added for intercalation, followed by sonication and repeated centrifugation to collect monolayer or few-layer MXene dispersions. After freeze-drying, MXene dispersions of different concentrations are prepared. Simultaneously, EVA spinning solutions of different concentrations are prepared. Coaxial needle spinning is then performed to obtain a smart wearable MXene@EVA coaxial nanofiber membrane that integrates excellent breathability, ultra-high electromagnetic shielding effectiveness, and superior shape memory properties, significantly overcoming the shortcomings of traditional electromagnetic protective clothing.

[0106] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for preparing a multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane, characterized in that: include, A few-layer MXene dispersion with a concentration of 5-15 wt% was prepared using N,N-dimethylformamide as a solvent; In the preparation of the few-layer MXene dispersion, anhydrous ethanol is selected as the intercalating agent; Ethylene-vinyl acetate copolymer, benzophenone and triallyl isocyanurate were added sequentially to a mixed solvent of toluene and DMF in a mass ratio of 7:2 to 4 at a mass ratio of 100:2 to 3:1 to prepare an EVA spinning solution with a concentration of 8 to 12 wt%. Coaxial electrospinning was performed using a few-layer MXene dispersion as the inner layer solution and EVA spinning solution as the outer layer solution. The inner layer solution was propelled at a speed of 0.9~1.1 ml / h, and the outer layer solution was propelled at a speed of 1.5~2.0 ml / h. After spinning, the solution was subjected to natural drying and UV curing in sequence to obtain a multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane.

2. The method for preparing the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane as described in claim 1, characterized in that: The coaxial electrospinning process involves spinning for 6-8 hours, with a spinning environment temperature of 40-60°C and a spinning environment humidity of 25%-45%.

3. The method for preparing the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane as described in claim 2, characterized in that: The collecting roller of the coaxial electrospinning has a rotation speed of 150~300 rpm.

4. The method for preparing the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane as described in claim 1, characterized in that: The natural drying time is 18-24 hours.

5. The method for preparing the multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane as described in claim 1, characterized in that: The UV curing time is 1~1.5h, and the UV wavelength is 300~450nm.

6. The multifunctional flexible wearable MXene@EVA coaxial nanofiber membrane prepared by any one of the preparation methods described in claims 1 to 5.

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