A two-dimensional polymer film based on reaction-diffusion theory and a preparation method and application thereof

Abstract

This application discloses a two-dimensional polymer thin film based on reactive diffusion theory, its preparation method, and its applications. The film exhibits a typical bilayer structure: the lower layer is a continuous and dense covalent organic framework substrate film with good crystallinity; the upper layer is a cyclic / honeycomb Turing structure formed by the orderly assembly of nanoparticles, exhibiting strong periodicity and high uniformity. The preparation method employs gas-liquid interface reactive diffusion: the monomer is dissolved in a mixed solvent of DMF and chlorobenzene, and acetic acid is used as a catalyst, which is then dropped onto the surface of deionized water. By controlling the monomer concentration (5 mg / mL), molar ratio (2:3), drop volume (15 μL), and diffusion resistance, the Turing structure can be precisely controlled. This invention features a mild process, can be used for large-area preparation, and produces thin films with regular structures and excellent stability. It can be directly applied to flexible electronics, membrane separation, sensing, and catalysis, effectively solving the technical bottlenecks of uncontrollable morphology, low crystallinity, and difficulty in large-scale production of traditional two-dimensional polymer thin films.

Description

Technical Field

[0001] This invention relates to the field of functional materials technology of two-dimensional polymers, and in particular to a two-dimensional polymer thin film based on reaction diffusion theory, its preparation method and application. Background Technology

[0002] In recent years, two-dimensional polymer films have made it possible to design and prepare thin film materials with high-performance separation, electronic and sensing functions due to their advantages of being able to precisely control the microstructure, pore environment and thickness through reasonable monomer structure design and interfacial reaction.

[0003] Further research has revealed that large-area covalent two-dimensional polymer films can be prepared at the gas-liquid interface via Schiff base reactions. Their self-supporting, highly uniform, and controllable thickness characteristics make them highly suitable for reactive diffusion self-organizing systems. The reactive diffusion mechanism is based on the difference and dynamic coupling of diffusion rates between activators and inhibitors, enabling the spontaneous formation of ordered Turing structures in a non-equilibrium state. The diffusion behavior of monomers at the interface, the matching degree of polymerization rates, and intermolecular forces significantly affect the regularity, periodicity, and stability of the Turing structure. Therefore, controlling the nucleation, growth, and morphological evolution of Turing structures to achieve controllable preparation and accurate characterization remains a key challenge. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for preparing two-dimensional polymer films based on reactive diffusion theory. This method yields films with reactive diffusion-type two-dimensional polymers as the functional layer, and introduces a Turing structure onto the film surface. The prepared two-dimensional polymer films with Turing structures exhibit large lateral dimensions, a bilayer structure, self-support, and tunable Turing structure. The films can be systematically analyzed for their microstructure and chemical composition using multi-dimensional characterization techniques. The Turing structure films obtained through this invention can be used for precise microstructure control and have wide applications in morphology evolution, structure-activity relationships, and multi-system expansion.

[0005] To achieve this technical objective, this invention discloses a two-dimensional polymer film based on the reactive diffusion theory, which is formed by the Schiff base condensation and reactive diffusion self-organization of aldehyde monomers and amino monomers, and has a bilayer structure.

[0006] The lower layer is a continuous and dense covalent organic framework substrate film with a thickness of 3–5 nm and clear lattice fringes;

[0007] The upper layer is a periodic Turing structure, assembled from uniformly sized nanoparticles in a ring or honeycomb shape, with a ring diameter of 9-28 μm, an internal included angle of 110°-130°, and a height of 50-245 nm.

[0008] This invention also discloses a method for preparing two-dimensional polymer films based on reactive diffusion theory, comprising the following steps:

[0009] S1, Substrate treatment;

[0010] S2. Prepare the aqueous phase;

[0011] S3. Prepare the organic phase;

[0012] S4. Interfacial film formation to obtain a two-dimensional polymer film;

[0013] S5, Post-processing.

[0014] Further, step S1 includes the following:

[0015] Silicon wafers were cleaned using a piranha solution.

[0016] After cleaning, the silicon wafer is ultrasonically treated with deionized water and isopropanol solvent in sequence.

[0017] After ultrasonic treatment, the silicon wafer with the smooth layer facing upwards is placed in a plasma cleaner for cleaning.

[0018] Further, step S3 includes the following:

[0019] An aldehyde monomer and an amino monomer were dissolved in N,N-dimethylformamide to prepare a mixed solution;

[0020] Dilute the mixed solution in chlorobenzene;

[0021] After dilution, acetic acid was added to chlorobenzene as a catalyst, and after mixing evenly, an organic phase was obtained.

[0022] Further, step S4 includes the following:

[0023] The organic phase is added dropwise to the reaction vessel containing the aqueous phase;

[0024] After the addition is complete, place the container lid on the reaction vessel and sandwich two layers of filter paper between the lid and the reaction vessel;

[0025] The reaction takes 48-72 hours.

[0026] Two-dimensional polymer films with Turing structures were prepared.

[0027] Further, step S5 includes the following:

[0028] The two-dimensional polymer film obtained in step S4 is transferred onto the substrate treated in S1.

[0029] Wash successively with deionized water and N,N-dimethylformamide containing acetic acid;

[0030] After washing, air dry at room temperature to obtain the finished product.

[0031] Furthermore, the aldehyde monomer is one of pyromellitic methyl ether or 1,3,5-tris(4-formylphenyl)benzene;

[0032] The amino monomer is one of 4,4'-diaminotriphenyl, benzidine, and p-phenylenediamine;

[0033] The molar ratio of aldehyde monomer to amino monomer is 2:3, and the total monomer concentration is 5 mg / mL.

[0034] Furthermore, the aldehyde monomer is pyromellitic methyl ether with a molar concentration of 2.48 μmol / L;

[0035] The amino monomer is 4,4'-diaminoterphenyl with a molar concentration of 3.73 μmol / L;

[0036] When diluting, take 50 parts by volume of the mixed solution and add it to 400 parts by volume of chlorobenzene.

[0037] Furthermore, the amount of acetic acid used is 1.5 parts by volume.

[0038] The present invention also discloses an application of two-dimensional polymer thin films based on reaction diffusion theory for precise control of microstructure, morphology evolution, structure-activity relationship and multi-system expansion.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] This invention provides a two-dimensional polymer thin film based on reaction-diffusion theory, which has a typical bilayer structure: a continuous and dense covalent organic framework substrate at the bottom and a periodic Turing structure at the top. This structure exhibits high stability, few defects, and good uniformity, making it suitable for high-end applications such as membrane separation, flexible electronics, and sensing. Furthermore, by establishing a correlation model between "reaction-diffusion parameters, molecular structure, and Turing morphology," the precise design of the microstructure of the two-dimensional polymer thin film can be effectively achieved, demonstrating excellent structural repeatability.

[0041] This invention provides a two-dimensional polymer thin film based on reaction diffusion theory. Based on multi-dimensional characterization and testing, the microstructure, chemical structure and optical properties of the film can be systematically analyzed. The structural evolution law is clear under different monomer systems and preparation parameters. The highest Turing structure with a diameter of 9 μm, a height of 242 nm and an internal angle of 130° can be achieved, with strong periodicity and high uniformity.

[0042] This invention provides a method for preparing two-dimensional polymer films based on reactive diffusion theory. This method utilizes reactive diffusion and Schiff base reaction, is simple to operate, does not require high-precision instruments, and can obtain large-area uniform, bilayer, self-supporting Turing structure films. Furthermore, the generated films can be transferred to any substrate, which is very convenient.

[0043] This invention provides a method for preparing two-dimensional polymer films based on reactive diffusion theory. This method enables precise control of the Turing structure by adjusting monomer concentration, ratio, and diffusion rate, including adjustable parameters such as ring diameter, height, order, and internal angles. Furthermore, the microstructure and structure of the film exhibit regular differences under different monomer systems and concentrations. This preparation method is mild, suitable for large-area fabrication, and produces films with regular structures and excellent stability. It can be directly applied to flexible electronics, membrane separation, sensing, and catalysis, effectively overcoming the technical bottlenecks of uncontrollable morphology, low crystallinity, and difficulty in large-scale production of traditional two-dimensional polymer films. Attached Figure Description

[0044] Figure 1 2DP provided for embodiments of this application TFB+TATB Optical images of thin films;

[0045] Figure 2 2DP provided for embodiments of this application TFB+TATB The morphology of thin films was characterized by atomic force microscopy.

[0046] Figure 3 2DP provided for embodiments of this application TFB+TATB High-resolution transmission electron microscope image of a thin film;

[0047] Figure 4 2DP provided for embodiments of this application TFB+TATB Raman spectroscopy images of thin films;

[0048] Figure 5 2DP provided for embodiments of this application TFB+TATB Image of the ultraviolet-visible absorption spectrum of the thin film;

[0049] Figure 6 2DP provided for embodiments of this application TFB+TATB Schematic diagram of the bilayer structure of the thin film;

[0050] Figure 7 The following are illustrations showing the evolution of Turing structure morphology at different monomer concentrations in the embodiments of this application;

[0051] Figure 8 The images show a comparison of the Turing structure morphology under different monomer systems provided in the embodiments of this application.

[0052] Figure 9A statistical diagram of the internal angle distribution of the Turing structure provided in the embodiments of this application;

[0053] Figure 10 A statistical diagram showing the distribution of Turing structure ring diameters provided in an embodiment of this application. Detailed Implementation

[0054] To fully understand the purpose, features and effects of the present invention, the present invention will be described in detail through the following specific embodiments, but the present invention is not limited thereto.

[0055] Example 1

[0056] This embodiment discloses a two-dimensional polymer film based on reactive diffusion theory, which is formed by the Schiff base condensation and reactive diffusion self-organization of aldehyde and amino monomers, exhibiting a bilayer structure. The lower layer is a continuous and dense covalent organic framework substrate film with a thickness of 3–5 nm and clear lattice fringes; the upper layer is a periodic Turing structure assembled from uniformly sized nanoparticles, exhibiting a ring or honeycomb shape, with ring diameters of 9–28 μm, internal included angles of 110°–130°, and heights of 50–245 nm.

[0057] Example 2

[0058] This embodiment discloses a method for preparing two-dimensional polymer thin films based on reactive diffusion theory, including the following steps:

[0059] S1. Substrate Treatment: A 1×1 cm silicon wafer was used as the substrate. The wafer was cleaned with a piranha solution (hydrogen peroxide to concentrated sulfuric acid ratio 3:7). After cleaning, the wafer was ultrasonically treated sequentially with deionized water and isopropanol. Specifically, an appropriate amount of deionized water or isopropanol solution was added to a beaker to completely submerge the wafer, which was then placed in an ultrasonic cleaner. The ultrasonic cleaning conditions were: ultrasonic power 40%, three ultrasonic treatments with each solvent, 5 minutes each time, followed by nitrogen drying. The wafer was then placed with the smooth layer facing upwards in a plasma cleaner. Specifically, the plasma cleaner was first evacuated to below 0.1 mbar, then oxygen was introduced into the plasma cleaner for 10 minutes, and the power of the plasma cleaner was adjusted to 80% for 5 minutes to remove surface oil and similar contaminants and increase the substrate's hydrophilicity.

[0060] S2. Prepare the aqueous phase by adding deionized water as the reaction interface carrier in a 7 cm diameter petri dish. The deionized water is ultrapure water with a resistivity of 18.25 MΩ·cm.

[0061] S3. Prepare the organic phase by dissolving the aldehyde monomer TFB (trimethylbenzenealdehyde) and the amino monomer TATB (4,4'-diaminoterphenyl) in 400 µL of DMF (N,N-dimethylformamide) at concentrations of 2.48 μmol / L and 3.73 μmol / L, respectively, to prepare a mixed solution of the two monomers. The total concentration of TFB and TATB monomers in the mixed solution is 5 mg / mL. Take 50 µL of the mixed solution and add it dropwise to 400 µL of chlorobenzene to dilute the mixed solution. Then add 1.5 µL of acetic acid as a catalyst to the chlorobenzene and mix well to obtain the organic phase.

[0062] S4. Interfacial film formation: 300 µL of organic phase is slowly added dropwise onto the aqueous phase prepared in step S2. A 7 cm petri dish is selected as the reaction vessel. Two layers of filter paper are sandwiched between the lid and bottom of the petri dish. The diffusion rate is controlled by adjusting the number of filter paper layers. Under acidic conditions, the two phases undergo a Schiff base condensation reaction. After 48 h of reaction, a large area of ​​2DP with a Turing structure is self-organized at the gas-liquid interface. TFB+TATB film.

[0063] S5. Post-processing: The 2DP obtained in step S4 is processed... TFB+TATB The film is transferred to the substrate treated in step S1, and then washed sequentially with deionized water and DMF containing acetic acid. After drying at room temperature, the finished product is obtained.

[0064] 2DP TFB+TATB The thickness of the lower organic framework substrate film is 4 nm; the thickness of the upper Turing structure is 242 nm, the diameter of the Turing ring structure is about 9 μm, the internal angle is 130°, the nanoparticle size is about 550 nm, and the height is 550 nm.

[0065] Example 3

[0066] This embodiment discloses a method for preparing two-dimensional polymer films based on reactive diffusion theory, which differs from Example 2 in that:

[0067] In step S2, the aldehyde monomer is TFB, with a concentration of 5 μmol / L in 400 µL of DMF, and the amino monomer is PPD (phenylenediamine), with a concentration of 5 μmol / L in 400 µL of DMF. The total concentration of TFB and PPD monomers is 5 mg / mL.

[0068] In step S3, the reaction time is 72 h, and the resulting two-dimensional polymer film is 2DP. TFB+PPD ;

[0069] In step S4, the filter paper consists of two layers.

[0070] 2DP TFB+PPDThe thickness of the lower organic framework substrate membrane is 5 nm; the thickness of the upper Turing structure is 56 nm, the diameter of the Turing ring structure is about 16 μm, and the internal angle is 120°.

[0071] Example 4

[0072] This embodiment discloses a method for preparing two-dimensional polymer films based on reactive diffusion theory, which differs from Example 2 in that:

[0073] In step S2, the aldehyde monomer is TFB, with a concentration of 5 μmol / L in 400 µL of DMF, and the amino monomer is BZD (benzidine), with a concentration of 5 μmol / L in 400 µL of DMF. The total concentration of TFB and BZD monomers is 5 mg / mL.

[0074] In step S3, the reaction time is 72 h, and the resulting two-dimensional polymer film is 2DP. TFB+BZD .

[0075] In step S4, the filter paper consists of two layers.

[0076] 2DP TFB+BZD The thickness of the lower organic framework substrate membrane is 4 nm; the thickness of the upper Turing structure is 73 nm, the diameter of the Turing ring structure is about 15 μm, and the internal angle is 120°.

[0077] Example 5

[0078] This embodiment discloses a method for preparing two-dimensional polymer films based on reactive diffusion theory, which differs from Example 2 in that:

[0079] In step S2, the aldehyde monomer is TFPB (1,3,5-tris(4-formylphenyl)benzene) with a concentration of 5 μmol / L in 400 µL of DMF, the amino monomer is PPD with a concentration of 5 μmol / L in 400 µL of DMF, and the total concentration of TFPB and PPD monomers is 5 mg / mL.

[0080] In step S3, the reaction time is 72 h, and the resulting two-dimensional polymer film is 2DP. TFPB+PPD .

[0081] In step S4, the filter paper consists of two layers.

[0082] 2DP TFPB+PPD The thickness of the lower organic framework substrate film is 4.8 nm; the thickness of the upper Turing structure is 107 nm, the diameter of the Turing ring structure is about 28 μm, and the internal included angle is 110°.

[0083] Example 6

[0084] This embodiment discloses a method for preparing two-dimensional polymer films based on reactive diffusion theory, which differs from Example 2 in that:

[0085] In step S2, the aldehyde monomer is TFPB, with a concentration of 5 μmol / L in 400 µL of DMF, and the amino monomer is TATB, with a concentration of 5 μmol / L in 400 µL of DMF. The total concentration of TFPB and TATB monomers is 5 mg / mL.

[0086] In step S3, the reaction time is 72 h, and the resulting two-dimensional polymer film is 2DP. TFPB+TATB .

[0087] In step S4, the filter paper consists of two layers.

[0088] 2DP TFPB+TATB The thickness of the lower organic framework substrate film is 4.1 nm; the thickness of the upper Turing structure is 59 nm, the diameter of the Turing ring structure is about 16 μm, and the internal angle is 115°.

[0089] In Examples 2-6, the deionized water used was ultrapure water with a resistivity of 18.25 MΩ·cm. The ultrasonic cleaner used was a KQ-800DE from Kunshan Ultrasonic Instrument Co., Ltd. It is understood that the reaction vessel can be a petri dish, weighing bottle, culture dish, glass water bath, or glass tank, etc. Depending on the area of ​​the reaction vessel, two-dimensional polymer films of different areas can be obtained. In all the above examples, a culture dish with a diameter of 7 cm was used as the reaction vessel. The prepared two-dimensional polymer films were subsequently transferred onto a silicon wafer substrate for characterization.

[0090] Includes the following characteristics:

[0091] Characterization 1: Microscopic morphology and structural characterization:

[0092] The morphology of the two-dimensional polymer films prepared in Examples 2-6 was observed to obtain information on film uniformity, Turing structure ring size, nanoparticle size, substrate film thickness, roughness, and lattice fringes.

[0093] Characterization 2: Chemical Structure Characterization

[0094] Raman spectroscopy was performed on the two-dimensional polymer films prepared in Examples 2-6. The Raman spectra were in the range of 1580-1595 cm⁻¹. -1 A characteristic peak for C=N appears at [location], and the monomeric C=O peak appears at 1686-1687 cm⁻¹. -1 ) and -NH2 (1281-1331 cm -1The disappearance of characteristic peaks and the appearance of characteristic peaks of C=O and -NH2, along with the appearance of characteristic peaks of C=N, are used to verify the completeness of the Schiff base condensation reaction.

[0095] Characterization 3: Optical bandgap characterization:

[0096] The two-dimensional polymer films prepared in Examples 2-6 were subjected to ultraviolet-visible absorption spectroscopy tests, and the changes in optical band gap with reaction time were calculated to reflect the degree of polymerization and the evolution of conjugated structure.

[0097] The various two-dimensional polymer films prepared in Examples 2-6 were systematically characterized using metallographic microscopy, AFM, TEM, Raman spectroscopy, and UV-Vis imaging.

[0098] AFM characterization was performed in Tapping mode, with scanning ranges of 50×50 μm and 10×10 μm.

[0099] Raman characterization was performed with an excitation wavelength of 785 nm and a test range of 100-2000 cm⁻¹. -1 ;

[0100] TEM characterization was performed using a microgrid copper mesh loaded with a thin film at an accelerating voltage of 200 kV.

[0101] The instruments involved are as follows:

[0102] Optical microscope model: Nikon LV100ND (Japan);

[0103] The atomic force microscope model is Bruker Dimension Icon XR from Germany. The atomic microscope test was conducted in Tapping mode, and the probe used was a Bruker VSEP-2A type tip.

[0104] Ultra-high resolution field emission transmission electron microscope: FEI Talos F200 X, USA;

[0105] Laser confocal Raman spectrometer: Renishaw in Via Qontor, UK;

[0106] Ultraviolet-Vis spectrometer: Lambda 750 UV / VIS / NIR (USA);

[0107] Figure 1 2DP prepared in Example 2 TFB+TATB Optical photograph of a thin film.

[0108] Figure 2 2DP prepared in Example 2 TFB+TATB The morphology of the thin film was characterized by atomic force microscopy, with a thickness of 242 nm.

[0109] Figure 3 2DP prepared in Example 2 TFB+TATB High-resolution transmission electron microscopy images of the thin film show that the underlying substrate film has clear lattice fringes, and the Turing structure is composed of ordered assembly of nanoparticles.

[0110] Figure 4 2DP prepared in Example 2 TFB+TATB Raman spectrum of thin film, 1590 cm⁻¹ -1 The appearance of the vibration peak indicates the occurrence of a Schiff base reaction between the two monomers, suggesting the successful formation of imine bonds in the film.

[0111] Figure 5 2DP prepared in Example 2 TFB+TATB The UV-Vis absorption spectrum of the thin film shows that the optical band gap gradually increases from 3.15 eV to 3.24 eV with reaction time.

[0112] Figure 6 2DP prepared in Example 2 TFB+TATB A schematic diagram of the bilayer structure of the thin film.

[0113] Figure 7 Evolution of Turing structure morphology of two-dimensional polymer films prepared in Examples 2-6 (7a is 2DP) TFB+TATB 7b is 2DP TFB+PPD 7c is 2DP TFB+BZD 7d is 2DP TFPB+PPD 7e is 2DP TFB+TATB The optimal concentration is 5 mg / mL. Below this range, the Turing structure is sparse, and above this range, aggregation occurs.

[0114] Figure 8 Comparison of Turing structure morphology under different monomer systems.

[0115] Figure 9 The included angle distribution within the Turing structure is concentrated between 120° and 130°.

[0116] Figure 10 The Turing structure has a ring diameter distribution, with the optimal system having a diameter of approximately 9 μm.

[0117] The results show that a monomer molar ratio of 2:3 is the optimal ratio, at which the activation-inhibition balance is optimal; the diffusion rate is controlled by diffusion resistance, and the Turing structure is most regular when the resistance is moderate; the difference in reaction diffusion coefficient directly determines the differences in pore size, angle, and order; all systems follow the stepwise self-organization mechanism of "basement membrane first, then Turing structure".

[0118] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. A two-dimensional polymer thin film based on reactive diffusion theory, characterized in that, It is formed by the Schiff base condensation and reactive diffusion of aldehyde monomers and amino monomers, exhibiting a bilayer structure. The lower layer is a continuous and dense covalent organic framework substrate film with a thickness of 3–5 nm and clear lattice fringes; The upper layer is a periodic Turing structure, assembled from uniformly sized nanoparticles in a ring or honeycomb shape, with a ring diameter of 9-28 μm, an internal included angle of 110°-130°, and a height of 50-245 nm.

2. The method for preparing a two-dimensional polymer thin film based on reactive diffusion theory according to claim 1, characterized in that, Includes the following steps: S1, Substrate treatment; S2. Prepare the aqueous phase; S3. Prepare the organic phase; S4. Interfacial film formation to obtain a two-dimensional polymer film; S5, Post-processing.

3. The method for preparing a two-dimensional polymer thin film based on reactive diffusion theory according to claim 2, characterized in that, Step S1 includes the following: Silicon wafers were cleaned using a piranha solution. After cleaning, the silicon wafer is ultrasonically treated with deionized water and isopropanol solvent in sequence. After ultrasonic treatment, the silicon wafer with the smooth layer facing upwards is placed in a plasma cleaner for cleaning.

4. The method for preparing a two-dimensional polymer thin film based on reactive diffusion theory according to claim 3, characterized in that, Step S3 includes the following: An aldehyde monomer and an amino monomer were dissolved in N,N-dimethylformamide to prepare a mixed solution; Dilute the mixed solution in chlorobenzene; After dilution, acetic acid was added to chlorobenzene as a catalyst, and after mixing evenly, an organic phase was obtained.

5. The method for preparing a two-dimensional polymer thin film based on reactive diffusion theory according to claim 4, characterized in that, Step S4 includes the following: The organic phase is added dropwise to the reaction vessel containing the aqueous phase; After the addition is complete, place the container lid on the reaction vessel and sandwich two layers of filter paper between the lid and the reaction vessel; The reaction was carried out for 48-72 hours to obtain a two-dimensional polymer film with a Turing structure.

6. The method for preparing a two-dimensional polymer thin film based on reactive diffusion theory according to claim 5, characterized in that, Step S5 includes the following: The two-dimensional polymer film obtained in step S4 is transferred onto the substrate treated in S1. Wash successively with deionized water and N,N-dimethylformamide containing acetic acid; After washing, air dry at room temperature to obtain the finished product.

7. A method for preparing a two-dimensional polymer thin film based on reactive diffusion theory according to any one of claims 4-6, characterized in that, The aldehyde monomer is one of pyromellitic methyl ether or 1,3,5-tris(4-formylphenyl)benzene; The amino monomer is one of 4,4'-diaminotriphenyl, benzidine, and p-phenylenediamine; The molar ratio of aldehyde monomer to amino monomer is 2:3, and the total monomer concentration is 5 mg / mL.

8. The method for preparing a two-dimensional polymer thin film based on reactive diffusion theory according to claim 7, characterized in that, The aldehyde monomer is pyromellitic methyl ether, with a molar concentration of 2.48 μmol / L; The amino monomer is 4,4'-diaminoterphenyl with a molar concentration of 3.73 μmol / L; When diluting, take 50 parts by volume of the mixed solution and add it to 400 parts by volume of chlorobenzene.

9. The method for preparing a two-dimensional polymer thin film based on reactive diffusion theory according to claim 8, characterized in that, The amount of acetic acid used is 1.5 parts by volume.

10. The application of a two-dimensional polymer thin film based on reactive diffusion theory according to claim 1, characterized in that, Used in flexible electronics, membrane separation, sensing, and catalysis.

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