KR101468380B1 - The preparing method of conductive long fiber coated with silver nanoparticles and the conductive long fiber coated with silver nanoparticles thereby - Google Patents

Abstract

It is an object of the present invention to provide a method for producing a silver-plated conductive filament and a silver-plated conductive filament prepared thereby. For this purpose, the present invention relates to polyamideimides (poly (amide-co-imide)) and poly (trimellitic anhydride chloride-co-4,4'- methylenedianiline) is dissolved in a solvent at a weight ratio of 4.5: 5.5 to 5.5: 4.5, followed by mixing (Step 1); Preparing a long fiber by electrospinning the mixed solution of step 1 (step 2); And forming silver nanoparticles on the surface of the long fiber of step 2 (step 3). The present invention relates to a method for manufacturing silver-plated conductive filaments by producing long fibers using polyamideimide and polytrimellitic anhydride chloride-4,4'-methylenedianiline as raw materials, , There is an effect that the silver nanoparticles can be homogeneously plated by activating the surface of the long fiber with a polyethylene glycol solution. The long fibers prepared according to the present invention can exhibit excellent conductivity as silver nanoparticles are plated on the surface of the fibers, and thus can be used as an electrode material.

Description

[0001] The present invention relates to a method for manufacturing a silver-plated conductive filament and a silver-plated conductive filament prepared by the method,

The present invention relates to a method for producing silver-plated conductive long fibers and silver-plated conductive long fibers prepared thereby.

Human beings have steadily developed the textile industry since acquiring the fibers from the natural materials of the first time. Past fibers have been used for limited purposes such as clothing production, but with the development of the chemical industry in the 1940s, artificial synthetic fibers such as nylon have become possible to be used.

Since the 1960s, it has become possible to mass-produce high-strength carbon fibers. The development of these fibers has become the basis for the manufacture of fibers having nano diameters which are required in various fields of industry in recent years. Currently, nanofibers and carbon nanofibers are positioned as advanced technologies in high-value industries such as composites, filters, biomaterials, cosmetics, and military

Generally, nanofiber refers to microfibers having a fiber diameter of 1 to 1,000 nm. Nanofibers can provide various physical and chemical properties that can not be obtained with micron-sized fibers. The nanofiber web has a porous As a separator type material, it can be very usefully used in various fields such as various filters, wound dressing, scaffolds, biochemical inorganic protective clothing, battery membranes for secondary batteries, and nanocomposites.

Meanwhile, since Formhals developed a device for the production of polymeric fibers using electrostatic force in 1934, many researchers have applied a variety of electrospinning methods using various polymers to various electrospinning devices to increase the radioactivity and productivity of electrospinning. Are being actively developed and applied.

In recent years, flash fiber spinning, electrospinning, and meltblown spinning have been widely used in the manufacture of nanofibers. However, since flash spinning is highly productive and can be mass-produced, it is dangerous because it requires high pressure. There is a limit. In the case of the electrostatic spinning method, it is effective to narrow the fiber diameter, but the solvent used to dissolve the polymer is unstable, which limits the mass production and lowers the productivity. Meltblown spinning has a higher yield than flash spinning and electrostatic spinning, but has limitations in miniaturizing fiber diameter to the nanometer level.

In order to solve these problems, Korean Patent No. 10-2004-0040692 and Korean Patent No. 2003-0077384 propose a manufacturing method of microfibers in which productivity and yield are improved by compromising melt blown spinning and electrostatic spinning.

However, such conventional electrospinning techniques are intended to increase the productivity, mainly regarding the modification and improvement of the electrospinning device. These techniques have limitations in advancing the radiation efficiency and productivity of electrospinning because they are aimed only at improving the radiation method and the radiation condition by excluding the modification of the polymer material. Therefore, it is expected that if the raw material of polymer is improved and it is applied to commercial production through electrospinning to improve the productivity and increase the radiation efficiency, it will bring about a great synergy effect with improvement of the spinning device. Is known to affect the efficiency of electrospinning.

On the other hand, synthetic fibers such as polyamide fibers and polyethylene terephthalate fibers generally have a problem that static electricity is generated and are liable to be charged. To solve such a problem, techniques for imparting conductivity to fibers have been studied. Conductive fibers are widely used because they can be used in textile products such as carpets to provide antistatic properties. In order to produce highly conductive fibers, Japanese Patent Publication No. 57-25647 discloses that conductive layers are exposed on the surface of fibers A conductive fiber or a metal fiber produced by coating a conductive material on a surface of a fiber or a fiber has been disclosed.

In order to improve the electrical properties of the polymer fibers, many researches have been conducted using conductive materials such as carbon black, carbon fiber, steel fiber, and silver. Recently, Research is underway to improve the efficiency of solar cells, supercapacitors, etc. using fibers as electrode materials. In addition, there is a continuing need for research for manufacturing nano-sized conductive filament fibers applicable to various fields as described above.

Accordingly, the inventors of the present invention have conducted research on the production of conductive filaments using polyamideimide and polytrimellitic anhydride-4,4'-methylenedianiline as long fibers, The silver nanoparticles can be uniformly plated and the nanoparticles can exhibit excellent conductivity as they are plated and thus can be used as an electrode material. Thus, the present invention has been completed.

It is an object of the present invention to provide a method for producing a silver-plated conductive filament and a silver-plated conductive filament prepared thereby.

To this end,

Polyamideimide (poly (amide-co-imide)) and poly (trimellitic anhydride chloride-co-4,4'-methylenedianiline) 5.5 to 5.5: 4.5 in a solvent and then mixing (step 1);

Preparing a long fiber by electrospinning the mixed solution of step 1 (step 2); And

And forming silver nanoparticles on the surface of the long fiber of step 2 (step 3).

The present invention also provides a silver-plated conductive filament produced by the above method.

Further, the present invention provides an electrode comprising the silver-plated conductive long fibers as described above.

The present invention relates to a method for manufacturing silver-plated conductive filaments by producing long fibers using polyamideimide and polytrimellitic anhydride chloride-4,4'-methylenedianiline as raw materials, The silver nanoparticles can be uniformly formed by activating the surface of the long fiber with a polyethylene glycol solution for silver plating. The long fibers prepared according to the present invention can exhibit excellent conductivity as silver nanoparticles are plated on the surface of the fibers, and thus can be used as an electrode material.

1 is a schematic view of a method for producing silver-plated conductive long fibers according to the present invention;
2 is an SEM image of the silver-plated conductive long fibers prepared in Examples 1 to 4 and 5 according to the present invention;
3 (a) is an energy dispersive X-ray spectrum of the silver-plated conductive long fiber prepared in Example 2 according to the present invention; (b) is an X-ray diffraction (XRD) graph;
4 is a graph of X-ray photoelectron spectroscopy (XPS) results of Examples 1 to 4 and Example 5 according to the present invention;
5 is a graph of X-ray photoelectron spectroscopy (XPS) results of Example 2, Comparative Example 1 and Comparative Example 2 according to the present invention;
FIG. 6 is a graph of the results of Fourier transform infrared spectroscopy (FT-IR) of Example 2, Comparative Example 1 and Comparative Example 2 according to the present invention;
7 is a graph of the results of Fourier transform infrared spectroscopy (FT-IR) of polyethylene glycol;
8 is a graph of the results of FT-IR (Fourier transform infrared spectroscopy) of Examples 1 to 4 and Example 5 according to the present invention;
9 is an atomic force microscope image of Example 2, Comparative Example 1 and Comparative Example 2 according to the present invention;
10 is a graph showing tensile strengths of long fibers prepared in Example 2, Comparative Example 1 and Comparative Example 4 according to the present invention;
11 is a schematic view of the chemical structure of a polyethylene glycol coating on a long fiber surface.

The present invention

Polyamideimide (poly (amide-co-imide)) and poly (trimellitic anhydride chloride-co-4,4'-methylenedianiline) 5.5 to 5.5: 4.5 in a solvent and then mixing (step 1);

Preparing a long fiber by electrospinning the mixed solution of step 1 (step 2); And

And forming silver nanoparticles on the surface of the long fiber of step 2 (step 3).

Hereinafter, the present invention will be described in detail by steps.

In the method for producing silver-plated conductive long fibers according to the present invention, the above step 1 is a step of preparing a silver-plated conductive long fiber by using polyamideimide (poly (amide-co-imide)) and poly (trimellitic anhydride) (trimellitic anhydride chloride-co-4,4'-methylenedianiline) is dissolved in a solvent at a weight ratio of 4.5: 5.5 to 5.5: 4.5, followed by mixing.

In the step 1, the polyamideimide and polytrimellitic anhydride chloride-4,4'-methylenedianiline are dissolved in a solvent in a weight ratio of 4.5: 5.5 to 5.5: 4.5, so that a suitable viscosity for producing long fibers through electrospinning , And when polyamideimide and polytrimellitic anhydride chloride-4,4'-methylenedianiline are mixed at a weight ratio out of the above range, a bead is formed in the prepared fiber , The diameter of the fibers may be uneven.

The polytrimellitic anhydride chloride-4,4'-methylenedianiline is used as a lubricant and is used for producing long fibers according to the amount of the polytrimellitic anhydride-4,4'-methylenedianiline added The viscosity of the resulting mixture can be adjusted appropriately, and thus the long fibers can be electrospun with a homogeneous diameter.

In the process for preparing silver-plated conductive long fibers according to the present invention, the solvent of Step 1 is mixed with dimethylsulfoxide (DMSO) and tetrahydrofuran (THF) at a weight ratio of 7: 3 to 2: 8 Solution, more preferably a weight ratio of 6: 4. The tetrahydrofuran is a solvent having a five-membered ring structure. When it is used, the attraction due to the van der Waals force between the molecules can be improved. Therefore, the tetrahydrofuran can be appropriately added in the range of 30 to 80 wt% . At this time, when it exceeds 45% by weight, continuous long fibers may not be produced during electrospinning, and therefore it is most preferable to mix it at 40% by weight.

In step 1, it is preferable that the polyamideimide and polytrimellitic anhydride chloride-4,4'-methylenedianiline are dissolved in the solvent in an amount of 25 to 35% by weight. When the polyamide-imide and poly (trimellitic acid) anhydrous chloride-4,4'-methylene dianiline are dissolved in a solvent in an amount of less than 25% by weight, the molecular weight of the mixed solution becomes low and it is difficult to produce long fibers through electrospinning , There is a problem that a large amount of beads exist in the formed fiber form. Further, when polyamideimide and polytrimellitic anhydride chloride-4,4'-methylenedianiline are dissolved in a solvent in an amount exceeding 35% by weight, electrospinning is difficult to perform due to entanglement of polymer chains.

In the method for producing silver-plated conductive long fibers according to the present invention, step 2 is a step of preparing long fibers by electrospinning the mixed solution of step 1 above.

The mixed solution prepared in the step 1 may be adjusted to have a viscosity suitable for electrospinning so that long fibers can be produced by electrospinning. At this time, the electrospinning of the step 2 can be performed by appropriately adjusting the applied voltage according to the composition of the mixed solution prepared in the step 1, and the electrospinning of the step 2 is performed by applying a voltage of 8 to 15 kV desirable. If electrospinning is carried out under an applied voltage of less than 8 kV, there is a problem that the thickness of the fibers is increased and microfibers other than nanofibers are produced. Further, when the electrospinning is carried out under an applied voltage exceeding 15 kV, there is a problem in that economic loss is caused as unnecessary energy is consumed in terms of energy efficiency, and since the performance of electrospinning is very unstable, There is a difficult problem.

At this time, it is preferable that the coil-like long fibers are recovered by winding them at a speed of 1000 to 1500 rpm using a drum collector. The drum collector is a device for winding and recovering long fibers, and a uniform coil shape can be formed by controlling the collection speed of the drum collector. In this case, when the long fibers are recovered below 1000 rpm, there is a problem that the diameter of the long fibers is rapidly increased, and when they are recovered in excess of 1500 rpm, they are rotated at an excessively high speed, .

In the method of manufacturing silver-plated conductive long fibers according to the present invention, it is preferable that the method further comprises a step of heat-treating the coil-shaped long fibers electrospun after the step 2 to remove the solvent.

The heat treatment of the recovered long fibers in step 2 can remove the organic solvent and additives in the nanofiber by heat treatment in a vacuum chamber. In addition, through the heat treatment in step 3, the nanofibers formed in a bundle are separated and opened, the molecules in the fibers have high orientation in the fiber axis direction, and the crystallinity is increased to improve the physical properties of the fibers. However, when the nanofibers prepared by electrospinning are subjected to heat treatment in a rapid temperature range, fusion of nanofibers occurs.

In the method for producing a silver-plated conductive long fiber according to the present invention, the step 3 is a step of forming silver nanoparticles on the long fiber surface of the step 2

The silver nanoparticles in step 3 are formed to impart conductivity to the long fibers, and the silver nanoparticles are preferably formed through electroless plating. Preferably, the electroless plating is performed using a mixed solution of an aqueous solution of silver nitrate and a reducing solution in such a manner that the metal ions are reduced and precipitated by a reducing agent to be plated. Specifically, the silver ions contained in the silver nitrate aqueous solution are reduced by the reducing solution to deposit silver nanoparticles on the surface of the long fibers, thereby forming silver-plated conductive long fibers. However, the electroless plating process is not limited thereto.

At this time, it is preferable that the reducing solution is glucose and tartaric acid. The glucose has a weak reducing ability and the tartaric acid has a reducing power capable of producing inverted sugars from glucose, so that they can be used as a reducing solution. Specifically, the aldehyde group (-CHO) in the glucose structure only reacts with Ag + and ammonia complex in the basic solution to oxidize the aldehyde and reduce Ag + to Ag to form silver nanoparticles.

In the method for producing a silver-plated conductive long fiber according to the present invention, it is preferable that the step (3) further comprises coating the surface of the long fiber with polyethyleneglycol (PEG) before forming the silver nanoparticles Do.

Polyethylene glycol has strong NH on the surface of long fiber ... O, OH ... O bonding and weak CH ... N and CH ... O bond to form a functional group. In the functional group, a metal is bonded to an ion, and a crown-like silver complex having a crown ether structure is formed (see FIG. 11).

At this time, the coating is preferably performed by immersing the long fiber in an aqueous solution of polyethyleneglycol (PEG) having a concentration of 0.5 wt% to 4 wt%. When the concentration of the polyethylene glycol aqueous solution is less than 0.5% by weight, the surface of the long fiber is not activated sufficiently, and the silver nanoparticles can not be uniformly formed on the surface of the long fiber. When the concentration is more than 4% by weight, Is excessively supplied and polyethylene glycol pieces may be precipitated and thus the silver nanoparticles may not be uniformly formed.

The present invention provides a silver-plated conductive long fiber produced by the above-described production method.

The silver-plated conductive long fibers according to the present invention can be produced by forming long fibers using polyamideimide and polytrimellitic anhydride-4,4'-methylenedianiline as raw materials, plating the prepared long fibers with silver . At this time, the raw material polyamideimide and polytrimellitic anhydride chloride-4,4'-methylenedianiline are mixed in a weight ratio of 4.5: 5.5 to 5.5: 4.5, and as the weight ratio is mixed, a viscosity suitable for electrospinning Can be prepared.

The silver-plated conductive filament according to the present invention can be prepared by activating the surface of the electrospun filament with polyethylene glycol at a concentration of 0.5% by weight to 4% by weight and uniformly forming silver nanoparticles by electroless plating , And when the concentration of polyethylene glycol is 1 to 2% by weight, the most homogeneous silver-plated conductive long fibers can be produced.

The present invention provides an electrode comprising the silver-plated conductive long fibers as described above.

The silver-plated conductive long fibers according to the present invention can exhibit excellent conductivity as silver nanoparticles are plated on the surface of the fibers, and thus can be used as an electrode material.

The present invention also provides an electronic device selected from the group consisting of a solar cell, a supercapacitor, and a display device, including the electrode.

As the silver electroplated conductive filament is used as an electrode material, the contact area of the electrode can be improved and a large current can be flowed, thereby improving the efficiency. At this time, the electrode may be an electrode of electrolytic plating or electroless plating, and may be suitably used in various fields requiring conductive fibers in addition to the above-mentioned fields.

Hereinafter, the present invention will be described in more detail with reference to the following examples and experimental examples.

However, the following examples and experimental examples are illustrative of the present invention, and the content of the present invention is not limited by the following examples and experimental examples.

≪ Example 1 > Preparation of silver-plated conductive filament 1

Step 1: Poly (amide-co-imide) and poly (trimellitic anhydride chloride-co-4,4'-methylenedianiline) polytrimellitic anhydride chloride (DMSO) and tetrahydrofuran (THF) in a weight ratio of 6: 4 in a weight ratio of 26: 1, and the mixed solution .

The mixed solution was electrospun in the form of a coil. (MN-20G-13, Iwashita Engineering, JAPAN) and a syringe pump (KD Scientific-100, USA) having an inner diameter of 0.60 mm, an outer diameter of 0.90 mm and a length of 13 mm, And the mixed solution was spun through a needle with a voltage of 9 kV at a flow rate of 150 ml.

Step 2: The distance between the tip of the electrospun needle and the collector collecting the radiated long fibers was fixed to 10 cm, and the first wet recovery was performed. Secondary recovery was performed at a speed of 1000 rpm by winding from a collector used for primary wet recovery using an alumina cylindrical drum collector. The recovered long fibers were dried in a vacuum chamber at a temperature of 190 캜 for 1 hour to evaporate the solvent. The electrospun filaments were then cyclized by heating in a furnace at a temperature of 330 DEG C for 1 hour.

Step 3: The long fibers were immersed in an aqueous solution of polyethylene glycol (PEG, polyethyleneglycol) having a molecular weight of 8000 and a concentration of 0.5 wt% for 20 minutes at room temperature to activate the surface.

On the other hand, 10 ml of ammonia was added dropwise to a 0.1 M aqueous AgNO ₃ solution prepared by dissolving AgNO ₃ in distilled water, and vigorous magnetic stirring was performed until the solution became transparent. Further, the solution was adjusted to pH 11 with sodium hydroxide (NaOH) to prepare an AgNO ₃ solution. The reducing solution was prepared by dissolving 45 g of glucose and 4 gdmf of tartaric acid in 1000 ml of pure water, boiling the solution once, cooling with 100 ml of ethanol, and stirring.

The AgNO ₃ solution was mixed with the reducing solution in a volume ratio of 1: 1 to prepare an electroless plating solution. The silver-plated conductive filament was prepared by electroless-plating the surface-activated long fiber using the electroless plating solution.

Example 2: Production of silver-plated conductive filament 2

Silver-plated conductive long fibers were prepared in the same manner as in Example 1, except that the long fibers were immersed in 1% by weight of polyethylene glycol in the step 3 of Example 1 above.

≪ Example 3 > Preparation of silver-plated conductive filament 3

Silver-plated conductive long fibers were prepared in the same manner as in Example 1, except that the long fibers were immersed in 2% by weight of polyethylene glycol in the step 3 of Example 1 above.

<Example 4> Production of silver-plated conductive filament 4

Silver-plated conductive long fibers were prepared in the same manner as in Example 1, except that the long fibers were immersed in 2% by weight of polyethylene glycol in the step 3 of Example 1 above.

&Lt; Example 5 > Production of silver-plated conductive filament 5

Silver-plated conductive long fibers were prepared in the same manner as in Example 1, except that the long fibers were not immersed in polyethylene glycol in the step 3 of Example 1 above.

&Lt; Comparative Example 1 &

Conductive long fibers were prepared in the same manner as in Example 1 except that only Step 2 of Example 1 was carried out.

&Lt; Comparative Example 2 &

Conductive long fibers were prepared in the same manner as in Example 2, except that in step 3 of Example 2, the long fibers were immersed in polyethylene glycol and then silver plating was not performed.

&Lt; Comparative Example 3 &

In step 2 of Example 1, the nanofibers were recovered without first wet recovery to prepare nanofabric long fiber.

<Experimental Example 1> Scanning electron microscopic observation

In order to confirm the microstructure of the silver-plated conductive long fibers according to the present invention, the long fibers prepared in Examples 1 to 5 were observed using a scanning electron microscope (SEM, Philips, XL-30S FEG Scanned Electron Microscope) This is shown in Fig.

As shown in FIG. 2, the long fibers prepared in Examples 1 to 5 are long fibers composed of straight straight strands, and according to an enlarged scanning electron microscope image on the right side, silver nanoparticles It can be confirmed that it is formed.

It can be confirmed that silver nanoparticles are plated on the entire surface of the long fibers in the long fibers of Examples 1 to 4 in which the surface is activated with polyethylene glycol (PEG). Particularly, when the concentration of polyethylene glycol is 1 To 2% by weight, it can be confirmed that the silver nanoparticles are most uniformly plated. In addition, when the concentration of polyethylene glycol was 4% by weight, it was confirmed that an excessively supplied polyethylene glycol fraction was precipitated. On the other hand, in the case of Example 5 in which silver is plated without activating the surface, it can be confirmed that silver nanoparticles are plated on only a part of the surface.

Therefore, when activating the surface of the long fiber with the polyethylene glycol in the concentration range of 0.5 to 4 wt%, the silver nanoparticles are uniformly plated on the surface, so that the long fiber having excellent conductivity can be produced.

<Experimental Example 2> Surface observation of silver-plated conductive filament

In order to observe the surface of the long fiber according to the present invention, the long fiber prepared in Example 2 was examined using an energy dispersive X-ray spectrum (EDS) ). In addition, X-ray diffraction analysis (XRD) was carried out and the results are shown in Fig. 3 (b).

According to FIG. 3 (a), the EDS analysis shows that the surface of the PAI / PTACM long fibers has 90% or more of net silver. 3 (b), XRD analysis shows that peaks are generated at 38.2 °, 44.3 ° and 64.5 °, which is the face centered cubic of (111), (200) and (220) Indicating that silver exists and that no other impurities are present.

Therefore, it was confirmed that PAI / PTACM long fiber coated with pure silver containing no impurities was produced.

Experimental Example 3 X-ray photoelectron spectroscopy 1

In order to confirm the binding energy of the silver nanoparticles according to the polyethylene glycol concentration according to the present invention, X-ray photoelectron spectroscopy (XPS) was performed on the long fibers prepared in Examples 1 to 5 , Which is shown in Fig.

4, it can be seen that the long fibers and the silver nanoparticles produced through Examples 1 to 5 have different strengths. It can be seen from this that the concentration of polyethylene glycol plays an important role in activating the surface of the long fiber with polyethylene glycol. In addition, it can be seen that the polyethylene glycol having the 1 wt% concentration has the highest strength in Example 2, indicating that the silver nanoparticles are uniformly plated when the polyethylene glycol is 1 wt% .

Experimental Example 4 X-ray photoelectron spectroscopy 2

In order to confirm the strength depending on the binding energies of Example 2, Comparative Example 1 and Comparative Example 2 according to the present invention, analysis was performed using X-ray photoelectron spectroscopy (XPS) Respectively.

5 (a), peaks of C 1s, N 1s and O 1s can be confirmed. According to FIG. 5 (b), when the surface of long fibers is activated in aqueous polyethylene glycol solution as in Comparative Example 2, A single peak is observed around eV and the presence of Na 1s can be confirmed. Furthermore, the 1s O: N peak height ratio increases from 24 to 40, indicating that the surface of the poly (ethylene glycol) long fiber is activated and the ratio of the oxygen element is increased. Referring to Figure 5 (c), it is possible to confirm that a strong Ag 3p _3/2 and Ag 3p _1/2 peak is present, it can be seen that the nanoparticle is a polyethylene glycol and a strong interaction through which .

Experimental Example 5 Infrared Spectroscopic Analysis 1

In order to confirm the strength according to the binding energy of Example 2, Comparative Example 1 and Comparative Example 2 according to the present invention, the analysis was performed using infrared spectroscopy (FT-IR). The results are shown in FIG. 6 . The results of infrared spectroscopic analysis of polyethylene glycol (PEG) are shown in FIG.

According to Fig. 7, polyethylene glycol (PEG) has a molecular weight of 3221 cm ^-1 (ν _OH ), 2880 cm ^-1 (ν _{CH 2} ) alkyl group, 1109 cm ^-1 (ν _CO ) dialkyl ether, 959 cm ^-1 _{隆 CH ( oop )} ) and 841 cm ^-1 _{( 隆 CC ( oop )} ) bonds.

Referring to Figure 6 (a), PAI / PTACM is 3019 cm ^-1 (ν _CH) aryl ^{group, 1776, 1711 cm -1 (ν} C = O) _{^{imide, 1690 cm -1 (ν C =}} O) amide I , 1597 cm ^-1 (ν _NH) amide _{^{II, 1495 cm -1 (ν C}} = C aromatic), 1367 cm ^-1 (imide _{^{stretch), 1219 cm -1 (ν CN}} ), 1086 cm -1 (ν CO ) Diaryl ether, 829 cm ^-1 (δ _{NH ( oop )} ) and 722, 605 cm ^-1 (δ _{CH ( oop )} ) and (δ _{CC ( oop )} ) bonds.

According to Fig. 6 (b), when the PAI / PTACM filament surface is activated with polyethylene glycol, a peak of 2880 cm ^-1 (ν _CH ) appears due to the -CH ₂ group.

At the same time, it can be seen that the (ν _CO ) dialkyl ether, δ _{CH ( oop )} and (δ _{CC ( oop )} ) bonds of the PEG are properly mixed. Of the PEG (ν _CO) cm 1104 is coupled to move as much as 5 cm ^{-1 -} it can be seen that changing to ^1, wherein the (ν _OH) bonds disappear or be substantially reduced. In addition, (ν _{C = O)} can be confirmed that the imide and amide (I) and (ν _NH) -amide significantly reduces the strength of the II bond, the imide bond stretch at 1367 cm ^-1 1342 cm ^{- 1} and move to , and (ν _CN ) bonds move from 1219 to 1237 cm ^-1 .

It can be clearly seen that the polyethylene glycol binds to the PAI / PTACM long fibers.

Experimental Example 6 Infrared Spectroscopic Analysis 2

In order to confirm the strength according to the binding energies of Examples 1 to 4 and Example 5 according to the present invention, the analysis was performed using infrared (FT-IR) spectroscopy (Fourier transform infrared spectroscopy) .

According to FIG. 8, as the concentration of polyethylene glycol increases, the transmittance at 2880 cm ^-1 (ν _CH ) gradually decreases. From this, it can be seen that the intensity of the bond of -CH ₂ group increases .

&Lt; Experimental Example 7 >

In order to confirm the microstructure of Example 2, Comparative Example 1 and Comparative Example 2 according to the present invention, they were observed using an atomic force microscope, and the results are shown in FIG.

According to FIG. 9, it can be confirmed that surface roughness of the surface increases as the long fiber is treated with polyethylene glycol and the silver is plated. As a result, in Comparative Example 2, polyethylene glycol appeared on the surface of the long fiber, and in Example 3, nanoparticles were formed.

According to Fig. 9 (d), it can be seen that the size of the silver nanoparticles varies from about 30 nm to over 20 nm, and that the silver nanoparticles are densely coated on the surface of the nanofiber have.

<Experimental Example 8> Tensile strength analysis

In order to analyze the mechanical strengths of Example 2, Comparative Example 1 and Comparative Example 4 according to the present invention, KSL 2515 was analyzed using a universal testing machine (UTM, UTM) Respectively. At this time, the gauge length of the specimen was 30.0 mm, the cross ^- sectional velocity was 10.0 mm min ^{- 1} , and the tensile pressure was applied parallel to the axial direction.

As shown in FIG. 10, it can be seen that the aligned long fibers increase to tensile strength of 141.26 MPa, so that the tensile strength remarkably increases as compared with the long fibers of the nanoweb type. It can be seen that the silver plated long fibers exhibit a tensile strength of 122.4 MPa.

Claims (10)

Polyamideimide (poly (amide-co-imide)) and poly (trimellitic anhydride chloride-co-4,4'-methylenedianiline) 5.5 to 5.5: 4.5 in a solvent and then mixing (step 1);
Preparing a long fiber by electrospinning the mixed solution of step 1 (step 2); And
And forming silver nanoparticles on the surface of the long fiber of step 2 (step 3).
The method according to claim 1,
Wherein the solvent of step 1 is a solution prepared by mixing dimethylsulfoxide (DMSO) and tetrahydrofuran (THF) in a weight ratio of 7: 3 to 2: 8 .
The method according to claim 1,
Wherein the silver nanoparticles of step 3 are formed through electroless plating.
The method of claim 3,
Wherein the electroless plating is performed using a mixed solution of an aqueous solution of silver nitrate and a reducing solution.
5. The method of claim 4,
Wherein the reducing solution is glucose or tartaric acid. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt;
The method according to claim 1,
Wherein the step (3) further comprises coating the surface of the long fiber with polyethyleneglycol (PEG) before forming the silver nanoparticles.
The method according to claim 6,
Wherein the coating is carried out by immersing the long fiber in an aqueous solution of polyethyleneglycol (PEG) in an amount of 0.5 to 4% by weight.
A silver-plated conductive filament produced by the manufacturing method of claim 1.
An electrode comprising the silver-plated conductive filament of claim 8.
An electronic device selected from the group consisting of a solar cell, a supercapacitor, and a display device, characterized by comprising the electrode of claim 9.

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