CN113174043A - Preparation method of polyaniline material with three-dimensional hierarchical micro-nano structure - Google Patents
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Abstract
A method for preparing a polyaniline material with a three-dimensional hierarchical micro-nano structure belongs to the field of preparation of high polymer materials. Respectively dissolving aniline monomer and oxidant in strong acid solution, freezing the aniline monomer or oxidant solution into ice, pouring precooled oxidant or aniline monomer solution on an ice layer, freezing into ice, and finally transferring ice blocks frozen together to a low-temperature environment for polymerization reaction to obtain the three-dimensional graded polyaniline materials with different shapes. The method does not need a soft and hard template, does not use an organic solvent, and has short reaction time. The polymerization reaction is carried out in a strong acid environment, the conductive property of polyaniline is ensured, and the hierarchical structure of the polyaniline can be regulated and controlled by changing the addition sequence of reactants and the size of an ice layer or adopting a multi-layer freezing mode. The preparation process is simple and controllable, the sample has high purity and unique appearance, is suitable for large-scale preparation, and has wide application potential in the fields of energy storage materials, adsorption materials, sensing materials, electromagnetic shielding materials, conductive functional materials and the like.
Description
Technical Field
The invention belongs to the field of preparation of high polymer materials, and particularly relates to a preparation method of a polyaniline material with a micro-nano structure.
Background
The polyaniline with a special form and a nano-structure, especially the polyaniline with a three-dimensional hierarchical micro-nano structure, has a larger specific surface area, higher conductivity and a highly reversible doping-dedoping process, especially has the advantages of common nano materials, can avoid the problem that the nano materials are easy to agglomerate in the application process, and further can give full play to the advantages of the polyaniline with the nano-structure, so that the materials show stronger application potential in many fields. At present, a lot of work reports about micro-nano polyaniline are reported, and the synthesized polyaniline shows different morphological structures, such as a spiral structure (CN 103910880A) and a rod structure (CN 110862564A); CN101302293A, a lamellar structure [ CN101302292A ], a three-dimensional vesicular structure [ CN106084775A ] and the like. However, the synthesis of these polyaniline materials requires the use of hard and soft templates [ CN 101302292A; CN101302294A, or interfacial polymerization method using water/organic solvent (or oil) [ CN 101037504A; CN 102476046A; CN 102432874A; CN 101710541A; CN 100497440C; CN100480443C ]. For the hard template method, a template with a specific structure needs to be synthesized firstly, while the soft template is difficult to avoid the damage to the polyaniline structure in the subsequent template removing process, particularly, the methods usually require three-dimensional structure assembly in a weak acid environment, and the conductivity of the generally synthesized polyaniline is poor; the interfacial method requires the use of organic solvents, which are often toxic. More importantly, the methods can only synthesize specific polyaniline with one or more similar morphological structures, and the complicated process liquid is difficult to meet the requirement of large-scale preparation of the polyaniline with the micro-nano structure. Therefore, the method is a key for realizing the practicality of the polyaniline with the micro-nano structure, the hierarchical micro-nano structure of the polyaniline can be regulated and controlled by adopting a green polymerization method without a template, and the higher conductivity of the polyaniline can be ensured.
Disclosure of Invention
The invention aims to provide a preparation method of polyaniline with a three-dimensional hierarchical micro-nano structure. The method adopts a freezing polymerization method, can prepare the polyaniline with controllable micro-nano structure in an all-water phase without a template, is simple, efficient and easy to operate, meets the requirement of large-scale production, and can effectively fill the blank in the prior art.
A method for preparing a polyaniline material with a three-dimensional hierarchical micro-nano structure comprises the following steps:
(1) respectively dissolving aniline monomer and oxidant in strong acid solution, and freezing the aniline monomer or oxidant solution into ice;
(2) then pouring the precooled aniline monomer or oxidant solution onto an ice layer and then freezing the aniline monomer or oxidant solution into ice;
(3) and finally, transferring the frozen ice blocks to a low-temperature environment for polymerization reaction to obtain the three-dimensional graded polyaniline materials with different shapes.
Preferably, the concentration of the aniline monomer is 0.5-0.05M, and the molar ratio of the aniline monomer to the oxidant is 4: 11-1: 4.
Preferably, the oxidant of the invention is a composite oxidant of ammonium persulfate, hydrogen peroxide, potassium permanganate, ferric trichloride and organic peroxide and a compound system thereof.
Preferably, the strong acid solution of the present invention is a mixed solution of an inorganic acid and an organic sulfonic acid, wherein the inorganic acid is one or more of hydrochloric acid, sulfuric acid or phosphoric acid.
Preferably, the concentration of the inorganic acid is 0.5-2.0M, and the dosage ratio of the strong acid to the organic sulfonic acid is 1: 0-4: 1.
Preferably, the thickness of the single-layer ice block is 0.5-3 cm, and the interface area of the ice layer and the ice layer is 5-50 cm2。
Preferably, the polymerization reaction temperature of the aniline monomer and the oxidant is-10 ℃, and the reaction time is 6-24 h.
Preferably, the nanostructure of the present invention exhibits a petal-like, sea urchin-like, caterpillar-like or fiber network-like nanostructure, and the hierarchical structure thereof is controlled by changing the order of addition of reactants, the size of ice layer or by multi-layer freezing.
The invention provides a method for preparing polyaniline with different micro-nano structures by adopting freeze polymerization. Firstly, respectively freezing aniline and an oxidant strong acid aqueous solution into ice layers, then pouring the precooled oxidant and the aniline strong acid aqueous solution onto the previous ice layers, freezing into ice, and finally polymerizing the polyaniline with the three-dimensional hierarchical micro-nano structure in a low-temperature environment. The method is carried out in a strong acid environment of a full water phase, and overcomes the defects that a special hard template is required in the prior method or the complicated removal process of a soft template and the damage to the polyaniline micro-nano structure are avoided; no organic solvent or emulsifier is needed to be added, so that the environment is protected; and can ensure the higher conductivity of the polyaniline. The synthesis process is simple and easy to operate, has strong controllability on the polyaniline micro-nano structure, and is suitable for large-scale production; according to different conductive characteristics and special structural characteristics of polyaniline, the requirements of different fields on conductive high polymer materials are met.
The invention provides an environment-friendly, simple and efficient freezing polymerization method, which is used for preparing polyaniline with a hierarchical structure and higher conductivity under a strong acid condition, does not need an additional template removal step or an organic solvent, can obtain three-dimensional hierarchical polyaniline with different shapes by simply changing the addition sequence of reactants, the size of an ice layer or multi-layer freezing, and has excellent performances in the aspects of energy storage, metal ion adsorption, gas sensing and the like.
(1) According to the preparation method of the polyaniline with the three-dimensional hierarchical micro-nano structure, the polyaniline with the micro-nano structure can be obtained only by overlapping ice layers formed by freezing strong acid aqueous solutions respectively containing aniline and an oxidant and polymerizing in a low-temperature environment; the method has the advantages of easily obtained raw materials, low cost, no need of templates and addition of organic solvents or any emulsifying agents, green synthesis process, simplicity, easy operation, short preparation period and suitability for large-scale production, and the whole reaction is carried out in a water phase;
(2) according to the invention, polyaniline with different micro-nano structures can be prepared by adjusting the addition sequence of reactants and the size or the number of ice layers; the structure controllability of the polyaniline is strong, the strong acid environment ensures the generation of doped polyaniline, and the synthesized polyaniline can show higher conductive property and structural characteristics with different forms;
(3) the polyaniline has higher conductivity and special structural characteristics, can well meet the requirements of the fields of energy storage materials, adsorption materials, sensing materials, electromagnetic shielding materials, conductive functional materials and the like, and can show more excellent performance and stronger application potential compared with the prior work.
Drawings
FIG. 1 is a schematic diagram of the preparation of hierarchical polyaniline using ice interface polymerization; scanning electron micrographs (upper left, lower left, upper right and lower right in sequence) show the nano-structured polyaniline synthesized in examples 1 to 4 of the present invention;
FIG. 2 is a field emission scanning electron micrograph of the petaloid polyaniline prepared in example 1;
fig. 3 is a graph of the adsorption performance of petal-shaped polyaniline prepared in example 2 under different concentrations of chromium ions;
FIG. 4 is a scanning electron micrograph of sea urchin-like polyaniline prepared in example 2 by field emission;
FIG. 5 is a constant current charge/discharge curve of the sea urchin-like polyaniline prepared in example 2 at a current density of 1A/g;
FIG. 6 is a scanning electron micrograph of caterpillars of polyaniline prepared in example 3;
FIG. 7 is a gas response curve of caterpillar-like polyaniline prepared in example 3 in 20PPM ammonia gas;
FIG. 8 is a scanning electron microscope image of the fiber network polyaniline prepared in example 4 by field emission;
fig. 9 is a cycle stability curve of polyaniline having a fiber network structure prepared in example 4 at a current density of 10A/g, in which a charge/discharge curve at a current density of 10A/g is shown.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
A method for preparing a polyaniline material with a three-dimensional hierarchical micro-nano structure comprises the following steps:
(1) respectively dissolving aniline monomer and oxidant in strong acid solution, and freezing the aniline monomer or oxidant solution into ice; the concentration of the aniline monomer is 0.5-0.05M, and the molar ratio of the aniline monomer to the oxidant is 4: 11-1: 4; the oxidant is a composite oxidant of ammonium persulfate, hydrogen peroxide, potassium permanganate, ferric trichloride and organic peroxide and a compound system thereof; the strong acid solution is a mixed solution of hydrochloric acid, sulfuric acid or phosphoric acid and other inorganic acids added with organic sulfonic acid; the concentration of the inorganic acid is 0.5-2.0M, and the dosage ratio of the strong acid to the organic sulfonic acid is 1: 0-4: 1. .
(2) Then pouring the precooled aniline monomer or oxidant solution onto an ice layer and then freezing the aniline monomer or oxidant solution into ice; the thickness of the single-layer ice block is 0.5-3 cm, and the interface area of the ice layer and the ice layer is 5-50 cm2。
(3) And finally, transferring the frozen ice blocks to a low-temperature environment for polymerization reaction to obtain the three-dimensional graded polyaniline materials with different shapes. The polymerization reaction temperature of the aniline monomer and the oxidant is-10 ℃, and the reaction time is 6-24 h. The nano structure is represented as a petal-shaped, sea urchin-shaped, caterpillar-shaped or fiber net-shaped nano structure, and the hierarchical structure of the nano structure is regulated and controlled by changing the adding sequence of reactants and the size of an ice layer or adopting a multi-layer freezing mode.
Example 1
The hierarchical polyaniline is prepared by an ice interface polymerization method (see fig. 1). 0.9128g of aniline is weighed and added into 20ml of 1.0M hydrochloric acid and dodecylbenzene sulfonic acid mixed solution (the amount of hydrochloric acid is 90 percent) to prepare aniline acid solution with the concentration of 0.2M, 0.3244g of ferric trichloride and 0.2762g of peroxybenzoic acid are weighed and added into 20ml of 1.0M hydrochloric acid and dodecylbenzene sulfonic acid mixed solution (the amount of hydrochloric acid is 90 percent) to prepare ferric trichloride and peroxybenzoic acid solution with the concentration of 0.2M; the acid solution of aniline monomer is placed in a glass container, and the liquid surface area is 10cm2Freezing to ice; then will bePre-cooling ferric trichloride and a benzoic acid peroxide solution in an ice bath, pouring the solution on the ice surface of aniline, and freezing the solution into ice; and finally, transferring the ice blocks to an ice bath for polymerization for 12 hours to obtain the hierarchical polyaniline. Polyaniline with petal-shaped structure was observed by using a field emission scanning electron microscope (SU-8010) (as shown in FIG. 2). And (3) dispersing the polyaniline powder into a potassium dichromate aqueous solution with the concentration of 25-175 mg/L, and testing the adsorption performance of the polyaniline under different chromium ion concentrations. FIG. 3 shows the polyaniline adsorption capacity at different concentrations of chromium ions, and it can be seen that the maximum adsorption capacity can reach 307mg/g when the concentration of chromium ions is 150 mg/L. Compared with the chromium ion adsorption capacity (291.13 mg/g) of the polyaniline/fiber ball prepared by the published Chinese invention patent [ CN111644161A ], the petal-shaped polyaniline can remove chromium ions more effectively.
Example 2
The hierarchical polyaniline is prepared by an ice interface polymerization method (see fig. 1). Weighing 1.141g of aniline into 10ml of 1.0M phosphoric acid solution to prepare aniline acid solution with the concentration of 0.5M, weighing 0.4658g of ammonium persulfate into 10ml of 1.0M phosphoric acid solution to prepare ammonium persulfate acid solution with the concentration of 0.5M; the acid solution of ammonium persulfate is placed in a glass container, and the liquid surface area is 25cm2Freezing to ice; precooling the aniline monomer solution in an ice bath, pouring the solution on the ice surface of ammonium persulfate, and freezing the solution into ice; and finally, transferring the ice blocks to an ice bath for polymerization for 8 hours to obtain the hierarchical polyaniline. Polyaniline with echinoid structure was observed by using a field emission scanning electron microscope (SU-8010) (as shown in FIG. 4). The prepared polyaniline is prepared into 2.0mg/ml aqueous dispersion, 5.0 mu L of solution is absorbed by a pipette and dropped on the surface of a glassy carbon electrode, and a constant current charge-discharge curve measured in 1.0M sulfuric acid solution by adopting a three-electrode system is shown in figure 5. At a current density of 1A/g, the specific capacitance of the electrode material was measured to be 639F/g. The specific capacitance value of the cabbage-shaped polyaniline prepared by the published Chinese invention patent [ CN107216454A ] is 584F/g under the current density of 0.1A/g, which is obviously lower than the specific capacitance of the polyaniline prepared by the invention under the higher current density, obviouslyThe polyaniline has more excellent electrochemical energy storage characteristics.
Example 3
The hierarchical polyaniline is prepared by an ice interface polymerization method (see fig. 1). 0.9128g of aniline is weighed and added into 20ml of 2.0M sulfuric acid and p-benzenesulfonic acid mixed solution (the amount of sulfuric acid is 90 percent) to prepare aniline acid solution with the concentration of 0.2M, 0.3726g of ammonium persulfate is weighed and added into 20ml of 2.0M sulfuric acid and p-benzenesulfonic acid mixed solution (the amount of sulfuric acid is 90 percent) to prepare ammonium persulfate acid solution with the concentration of 0.2M; the acid solution of ammonium persulfate is placed in a glass container, and the liquid surface area is 30cm2Freezing to ice; precooling the aniline monomer solution in an ice bath, pouring the solution on the ice surface of ammonium persulfate, and freezing the solution into ice; and finally, transferring the ice blocks to an ice bath for polymerization for 6 hours to obtain the hierarchical polyaniline. Polyaniline with a caterpillar-like structure was observed by using a field emission scanning electron microscope (SU-8010) (as shown in FIG. 6). And dissolving the prepared polyaniline in deionized water to prepare a solution of 2.0mg/ml, and dripping 0.1ml of the solution onto the interdigital electrode by using a pipette to prepare the sensor. The device was then exposed alternately to 20PPM ammonia vapor and dry air, and the resistance change of the polyaniline sensing material in different environments was recorded, and the response curve was recorded as shown in fig. 7. It can be seen that the polyaniline sensing device can achieve a saturated response to ammonia within 50S and can be reduced in a very short time. Compared with the response time of the polyaniline nanobelt prepared by the published Chinese patent No. CN110684194A in ammonia gas with the same concentration of 60S, the polyaniline prepared by the invention has better ammonia gas response capability.
Example 4
The hierarchical polyaniline is prepared by an ice interface polymerization method (see fig. 1). Weighing 0.4564g of aniline into 40ml of a 1.0M hydrochloric acid and p-benzenesulfonic acid mixed solution (the amount of the hydrochloric acid is 95 percent) to prepare an aniline acidic solution with the concentration of 0.1M, and weighing 0.1863g of ammonium persulfate into 40ml of a 1.0M hydrochloric acid and p-benzenesulfonic acid mixed solution (the amount of the hydrochloric acid is 95 percent) to prepare an ammonium persulfate acidic solution with the concentration of 0.1M; the acid solution of ammonium persulfate is placed in a glass container, and the liquid surface area is 50cm2Is cool and coolFreezing into ice; precooling the aniline monomer solution in an ice bath, pouring the solution on the ice surface of ammonium persulfate, and freezing the solution into ice; alternately pouring, repeating for three times to prepare six layers of ice blocks; and finally, transferring the ice blocks to an ice bath for polymerization for 12 hours to obtain the hierarchical polyaniline. Polyaniline with a fiber network structure (as shown in FIG. 8) was observed by using a field emission scanning electron microscope (SU-8010). The prepared polyaniline was prepared into 2.0mg/ml aqueous dispersion, 5.0 μ L of the solution was dropped onto the surface of a glassy carbon electrode by a pipette, and charge-discharge cycle measurement was performed in 1.0M sulfuric acid solution at a current density of 10A/g using a three-electrode system (as shown in fig. 9). After 2000 times of charge-discharge cycles, the retention rate of the specific capacitance of the polyaniline electrode material is 75.1%. Compared with the flower-ball-shaped polyaniline prepared by the published Chinese patent of invention [ CN104264267A ] which is charged and discharged for 1000 times and the retention rate is 70.7%, the polyaniline prepared by the invention has stronger working stability.
The performance of the polyaniline with different morphologies prepared by the invention as an adsorbing material, an energy storage material and a gas sensing material is compared with the performances of the disclosed invention patents as shown in the following table.
As can be seen from the above table: according to the preparation method of the polyaniline material with the three-dimensional hierarchical micro-nano structure, the petal-shaped, sea urchin-shaped, caterpillar-shaped or fiber net-shaped nano structure can be obtained by changing the addition sequence of reactants and the size or layer number mode of an ice layer. The materials can effectively avoid the problem that low-dimensional materials are easy to agglomerate in the using process, and simultaneously can provide the advantage of polymerizing high-conductivity polyaniline in a strong acid environment, the unique morphology structure and the higher conductivity of the materials can enable the materials to show performance superior to that of the prior work when being used as functional materials for energy storage, adsorption, sensing and the like, and in addition, the method has the advantages of easily obtained raw materials, low cost, no need of templates and addition of organic solvents or any emulsifying agents, the whole reaction is carried out in a water phase, the synthesis process is green, simple and easy to operate, the preparation period is short, the method is suitable for large-scale production, and the strong application potential is shown.
Claims (8)
1. A method for preparing a polyaniline material with a three-dimensional hierarchical micro-nano structure is characterized by comprising the following steps:
(1) respectively dissolving aniline monomer and oxidant in strong acid solution, and freezing the aniline monomer or oxidant solution into ice;
(2) then pouring the precooled aniline monomer or oxidant solution onto an ice layer and then freezing the aniline monomer or oxidant solution into ice;
(3) and finally, transferring the frozen ice blocks to a low-temperature environment for polymerization reaction to obtain the three-dimensional graded polyaniline materials with different shapes.
2. The method for preparing the polyaniline material with the three-dimensional hierarchical micro-nano structure according to claim 1, which is characterized by comprising the following steps: in the step (1), the concentration of the aniline monomer is 0.5-0.05M, and the molar ratio of the aniline monomer to the oxidant is 4: 11-1: 4.
3. The method for preparing the polyaniline material with the three-dimensional hierarchical micro-nano structure according to claim 1, which is characterized by comprising the following steps: the oxidant is a composite oxidant of ammonium persulfate, hydrogen peroxide, potassium permanganate, ferric trichloride and organic peroxide and a compound system thereof.
4. The method for preparing the polyaniline material with the three-dimensional hierarchical micro-nano structure according to claim 1, which is characterized by comprising the following steps: the strong acid solution is a mixed solution of inorganic acid and organic sulfonic acid, and the inorganic acid is one or more of hydrochloric acid, sulfuric acid or phosphoric acid.
5. The method for preparing the polyaniline material with the three-dimensional hierarchical micro-nano structure according to claim 4, which is characterized by comprising the following steps: the concentration of the inorganic acid is 0.5-2.0M, and the dosage ratio of the strong acid to the organic sulfonic acid is 1: 0-4: 1.
6. The method for preparing the three-dimensional grading micro-nano structure according to claim 1A method of structuring a polyaniline material, comprising: in the step (2), the thickness of the single-layer ice block is 0.5-3 cm, and the interface area of the ice layer and the ice layer is 5-50 cm2。
7. The method for preparing the polyaniline material with the three-dimensional hierarchical micro-nano structure according to claim 1, which is characterized by comprising the following steps: in the step (3), the temperature of polymerization reaction of the aniline monomer and the oxidant is-10 ℃, and the reaction time is 6-24 hours.
8. The method for preparing the polyaniline material with the three-dimensional hierarchical micro-nano structure according to claim 1, which is characterized by comprising the following steps: in the step (3), the nano structure is expressed as a petal-shaped, sea urchin-shaped, caterpillar-shaped or fiber net-shaped nano structure, and the hierarchical structure of the nano structure is regulated and controlled by changing the adding sequence of reactants and the size of an ice layer or adopting a multi-layer freezing mode.
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