Fiber structure and method for manufacturing the same

Abstract

This invention provides a fibrous structure in which carbon nanotubes are firmly attached to a base fabric to improve conductivity, and a method for manufacturing the same. [Solution] The fiber structure 1 comprises a base fabric 10 made of synthetic fibers having grooves on its surface and an irregular cross-sectional shape, which are formed by smooth knitting, and carbon nanotubes 25 attached to the base fabric 10. The manufacturing method of the fiber structure 1 includes a carbon nanotube dispersion immersion step in which the base fabric 10 is immersed in a carbon nanotube dispersion 24, which is obtained by dispersing carbon nanotubes 25 in an aprotic solvent 23, and a solvent removal step after the carbon nanotube dispersion immersion step in which the base fabric 10 to which the carbon nanotube dispersion 24 has been attached is dried and the aprotic solvent 23 is removed.

Description

Technical Field

[0001] The present invention relates to a fiber structure and a method for manufacturing the same.

Background Art

[0002] Studies have been conducted in various fields to attach carbon nanotubes (CNTs) onto the surface of synthetic fibers to impart the function of conductive cloth. Patent Document 1 discloses a technique for forming conductive fibers by immersing synthetic fibers in a carbon nanotube dispersion liquid containing a binder.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in Patent Document 1, since the base fabric is formed after creating polyester textured yarns with attached carbon nanotubes, there is a possibility that the carbon nanotubes may peel off during the base fabric forming process and the resistance value may fluctuate. Furthermore, since the carbon nanotube dispersion liquid contains a non-conductive binder, there is a problem that the conductivity decreases.

[0005] The present invention has been made in view of the problems of such conventional techniques. An object of the present invention is to provide a fiber structure in which carbon nanotubes are firmly attached to a base fabric to improve conductivity, and a method for manufacturing the same.

Means for Solving the Problems

[0006] The fiber structure according to the present embodiment includes a base fabric formed by smooth knitting of synthetic fibers having grooves on the surface and an amorphous cross-sectional shape, and carbon nanotubes attached to the base fabric.

[0007] The method for manufacturing a fiber structure according to this embodiment is the method for manufacturing a fiber structure described above, comprising: a carbon nanotube dispersion immersion step in which a base fabric is immersed in a carbon nanotube dispersion liquid in which carbon nanotubes are dispersed in an aprotic solvent; and a solvent removal step after the carbon nanotube dispersion immersion step in which the base fabric to which the carbon nanotube dispersion liquid has adhered is dried and the aprotic solvent is removed. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a fibrous structure in which carbon nanotubes are firmly attached to a base fabric to improve conductivity, and a method for manufacturing the same. [Brief explanation of the drawing]

[0009] [Figure 1A] This is an SEM image showing the cross-sectional structure of the synthetic fiber according to this embodiment. [Figure 1B] This is a schematic diagram showing the smooth knit structure of synthetic fibers. [Figure 2] This is a schematic diagram showing the method for producing a fiber structure according to this embodiment. [Figure 3] This is a schematic diagram of an experiment to measure sheet resistance. [Figure 4] This is a schematic cross-sectional view showing the plain weave structure of a synthetic fiber. [Figure 5] This graph shows the measurement results of sheet resistance and carbon nanotube adhesion amount as a percentage of basis weight for the fiber structure according to this embodiment. [Figure 6A] This is an SEM image of a smooth-knit base fabric (basis weight 129 g / m2) before immersion in a CNT dispersion. [Figure 6B] This is an SEM image of a smooth-knit base fabric (basis weight 266g / m2) before immersion in a CNT dispersion. [Figure 7A] This is an SEM image of a plain weave base fabric (basis weight 134 g / m2) before immersion in a CNT dispersion. [Figure 7B]SEM photograph of a plain woven base fabric (areal density 273 g / m2) before immersion in the CNT dispersion liquid. [Figure 8A] SEM photograph of a smooth knitted base fabric (areal density 129 g / m2) after immersion in the CNT dispersion liquid. [Figure 8B] SEM photograph of a smooth knitted base fabric (areal density 266 g / m2) after immersion in the CNT dispersion liquid. [Figure 9A] SEM photograph of a plain woven base fabric (areal density 134 g / m2) after immersion in the CNT dispersion liquid. [Figure 9B] SEM photograph of a plain woven base fabric (areal density 273 g / m2) after immersion in the CNT dispersion liquid. [Figure 10A] Optical microscope photograph of the fiber structure according to this embodiment. [Figure 10B] Optical microscope photograph of a plain woven base fabric after immersion in the CNT dispersion liquid. [Figure 11A] Graph showing the measurement results of sheet resistance with respect to areal density for the fiber structure according to this embodiment. [Figure 11B] Graph showing the measurement results of the amount of carbon nanotube adhesion with respect to areal density for the fiber structure according to this embodiment. [Figure 12] Electron microscope photograph of the fiber structure according to this embodiment. [Figure 13] Electron microscope photograph of a base fabric of synthetic fiber with a round cross-section after immersion in the CNT dispersion liquid.

Mode for Carrying Out the Invention

[0010] Hereinafter, the fiber structure according to this embodiment and its manufacturing method will be described in detail with reference to the drawings. Note that the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may differ from the actual ratios.

[0011] [Fiber Structure] The fiber structure 1 comprises a base fabric 10 made of synthetic fibers having grooves on its surface and an irregular cross-sectional shape, which are formed by smooth knitting, and carbon nanotubes (hereinafter referred to as CNTs) 25 attached to the base fabric 10.

[0012] (Synthetic fiber) While the synthetic fiber is not particularly limited, it is preferable that it be at least one selected from the group consisting of polyester fibers, polyamide (nylon) fibers, polyolefin fibers, acrylic fibers, polyurethane fibers, and cellulose fibers. Of these, polyethylene terephthalate fiber (hereinafter referred to as PET fiber), which is a type of polyester fiber, is easily permeated by a carbon nanotube dispersion (hereinafter referred to as CNT dispersion) 24 in which CNTs 25 are dispersed in an aprotic solvent 23, and the CNTs 25 adhere strongly. For this reason, polyester fibers are more preferable as the synthetic fiber, and PET fibers are even more preferable.

[0013] Synthetic fibers have grooves on their surface and an irregular cross-sectional shape. An example of a synthetic fiber is Calculo®, a PET fiber manufactured by Teijin Frontier Ltd., as shown in Figure 1A. Calculo has an irregular cross-sectional shape with deep grooves on its fiber surface, and also has a random single-fiber cross-sectional shape in the fiber axis direction. Because it has large interfiber voids, it has superior water absorption and drying properties compared to conventional round-section PET fibers, and can provide sweat absorption and quick drying properties. By utilizing the characteristic cross-sectional shape of such PET fibers, the adhesion of the interface is improved through the anchoring effect and contact area expansion effect, making it easier for PET fibers and CNTs to intertwine and allowing CNTs to adhere firmly to the PET fibers.

[0014] (base fabric) The base fabric 10 is made of the above-mentioned synthetic fibers in a smooth knit. Smooth knit is a fabric made by knitting a general knit fabric in a double layer, as shown in Figure 1B. The basis weight of the base fabric 10 is 80 to 300 g / m from the viewpoint of conductivity. 2 Preferably, it is 129-266 g / m² 2This is more preferable. In a smooth knitted base fabric, as the basis weight increases, the voids between fibers increase, and these increased voids can increase the amount of carbon nanotubes (CNTs) that can be attached.

[0015] (Carbon nanotubes) The fiber structure 1 comprises CNTs 25 attached to a base fabric 10. As described later, the CNTs 25 can be attached to the base fabric 10 by immersing the base fabric 10 in a CNT dispersion 24. Alternatively, the CNTs 25 may be contained in a conductive film formed on the surface of the base fabric 10.

[0016] The carbon nanotubes (CNTs) are preferably at least one selected from the group consisting of single-walled carbon nanotubes (SWCNTs), double-walled carbon nanotubes (DWCNTs), and multi-walled carbon nanotubes (MWCNTs). From the viewpoint of conductivity, SWCNTs are more preferable. Furthermore, the central diameter of the SWCNTs is preferably 0.5 nm to 5 nm, and more preferably 1 nm to 3 nm. In addition, the length of the SWCNTs is preferably 1 μm to several tens of μm.

[0017] As described above, the fiber structure 1 according to this embodiment comprises a base fabric 10 made of synthetic fibers having grooves on its surface and an irregular cross-sectional shape, which are formed by smooth knitting, and CNTs 25 attached to the base fabric 10. According to the fiber structure 1 according to this embodiment, it is possible to provide a fiber structure in which the CNTs 25 are firmly attached to the base fabric 10 and the conductivity is improved.

[0018] [Method for manufacturing fiber structures] The method for manufacturing the fiber structure 1 comprises a carbon nanotube dispersion immersion step (hereinafter referred to as the CNT dispersion immersion step) and a solvent removal step.

[0019] (CNT dispersion immersion process) The CNT dispersion immersion step involves immersing the base fabric 10 in a CNT dispersion 24, which is a CNT dispersion 24 in which CNTs 25 are dispersed in an aprotic solvent 23.

[0020] An aprotic solvent 23 is used as the dispersion solvent for the CNT dispersion 24. The aprotic solvent 23 is preferably at least one selected from the group consisting of DMF (N,N-dimethylformamide), DMSO (dimethyl sulfoxide), DMA (N-methylacetamide), and acetonitrile. Both the aprotic solvent 23 and CNT 25 are highly polar, and even without the addition of dispersants such as surfactants, the CNT 25 is uniformly dispersed in the aprotic solvent 23, yielding a good CNT dispersion 24 composed solely of CNT 25. When the synthetic fiber is a PET fiber, DMF is more preferable from the viewpoint of its ease of penetration into the interior of the PET fiber.

[0021] DMF is an amide formed by the condensation of formic acid and dimethylamine. The amide bond is a relatively stable bond and does not react easily with nucleophiles or electrophiles, so it is used as an organic solvent. Furthermore, DMF has a carbonyl group and is polarized and highly polar, so it is called an aprotic polar solvent. On the other hand, CNT25 is highly polar and has high stereoregularity, exhibiting properties that make it easy for molecules to attract and aggregate. Since DMF molecules contain amide bonds, and amide bonds and carbon are easily adsorbed, a CNT dispersion 24 in which CNT25 is uniformly dispersed in the DMF solvent can be obtained without the addition of dispersants such as surfactants.

[0022] PET fibers have a microphase separation structure in which crystalline and amorphous regions are separated. When an aprotic solvent 23 (DMF) acts on them, the DMF penetrates the amorphous region of the PET fiber, causing softening and swelling. This effect is more pronounced at higher temperatures as molecular movement becomes more active, allowing for deeper penetration. Since the glass transition temperature of PET fibers is 70°C, at temperatures above 70°C, the molecular movement in the crystalline region also becomes more active, allowing DMF to penetrate into the interior of the crystalline region, disrupting the crystalline structure. This can lead to unstable dispersion of crystal grains during recrystallization, potentially causing a decrease in physical properties. Therefore, the action of DMF must be performed at temperatures below 70°C to maintain the physical properties of the PET fiber.

[0023] Furthermore, the interface between the PET fibers and CNTs becomes entangled in the surface layer due to the softening and swelling action of the PET fibers. When the DMF is removed, the PET fibers return to their original state, improving the adhesion strength of the interface, thus allowing the CNTs to adhere firmly to the PET fibers on their own.

[0024] As described above, a binder is not required in the CNT dispersion 24. In conventional methods, when synthetic fibers are immersed in a CNT dispersion containing a binder, the conductivity may decrease because the binder's components are nonconductive. In the manufacturing method of the fiber structure according to this embodiment, by not including a binder in the CNT dispersion 24, a fiber structure 1 with improved conductivity compared to conventional methods can be produced.

[0025] The method for preparing the CNT dispersion 24, in which CNTs 25 are dispersed in an aprotic solvent 23, is not particularly limited. To improve the dispersibility of CNTs 25 in the aprotic solvent 23, they can be pulverized using a grinder such as a ball mill, rotor speed mill, cutting mill, homogenizer, vibratory mill, or attritor, and then dispersed in the aprotic solvent 23. Since both the aprotic solvent 23 and CNTs 25 are highly polar, CNTs 25 can be uniformly dispersed in the aprotic solvent 23 without the addition of dispersants such as surfactants. Furthermore, the wettability of CNTs 25 in the aprotic solvent 23 is improved, and the CNTs 25 can be finely broken down.

[0026] The method for immersing the base fabric 10 in the CNT dispersion 24 is not particularly limited, and general impregnation methods such as those involving micro-vibration can be used. However, applying micro-vibration may cause a rise in the temperature of the CNT dispersion 24, making it easier for the aprotic solvent 23 to penetrate into the base fabric 10, increasing its attack on the base fabric 10, which could lead to dissolution of the base fabric 10, changes in its crystal structure, and a decrease in its physical properties.

[0027] Therefore, as a method for immersing the base fabric 10 in the CNT dispersion 24, it is preferable to use a ball mill 50, as shown in Figure 2. By using a ball mill 50, a uniform conductive film containing CNTs 25 can be formed on the base fabric 10 while maintaining the dispersibility of CNTs 25 in the aprotic solvent 23. Specifically, the base fabric 10 and the CNT dispersion 24 are placed in the ball mill 50, and the CNT dispersion 24 is dispersed on the base fabric 10 while stirring. A certain amount of balls 51, which are the dispersion medium, are placed in the cylindrical container of the ball mill 50. When the ball mill 50 is rotated around its horizontal axis, the balls 51 are lifted to a certain height along the inner wall as the cylindrical container rotates, and circulate in a certain direction within the cylindrical container by sliding along the inner wall or rolling down. A uniform conductive film can be formed on the base fabric 10 during the circulating movement of the balls 51. This method using the ball mill 50 results in almost no temperature rise, suppresses the penetration of the aprotic solvent 23 into the base fabric 10, and allows for the deposition of a conductive film containing CNTs 25 onto the base fabric 10 while minimizing the deterioration of the base fabric 10's physical properties.

[0028] The concentration of CNT25 in the CNT dispersion 24 is preferably 0.01 to 0.5% by mass, more preferably 0.05 to 0.2% by mass, and even more preferably 0.08 to 0.12% by mass, based on 100% by mass of the CNT dispersion 24. When the concentration of CNT25 is within the above range, it is easy to form a uniform conductive film containing CNT25 on the base fabric 10, and the CNTs can be firmly attached to the base fabric 10.

[0029] Prior to the CNT dispersion immersion step, a pretreatment step may be included in which the synthetic fiber or base fabric 10 is immersed in polydopamine (hereinafter referred to as PDA). PDA is a catechol-based polymer that mimics the byssal threads of the mussel (a type of bivalve), and has catechol groups, amino groups, and benzene rings, and can bind to various materials. It can change the surface properties of PET fibers, etc., and improve adhesion with the conductive film containing CNTs 25.

[0030] (Solvent removal process) The solvent removal step involves drying the base fabric 10 to which the CNT dispersion 24 has adhered after the CNT dispersion immersion step, thereby removing the aprotic solvent 23. As described above, when the temperature of the base fabric 10 exceeds the glass transition temperature, the movement of molecules in the crystalline portion becomes more active, the solvent penetrates into the crystal structure, the crystal structure collapses, and the dispersion of crystal grains becomes unstable during recrystallization, potentially leading to a decrease in physical properties. Therefore, it is preferable that the temperature of the solvent removal step be below the glass transition temperature of the base fabric 10.

[0031] From the viewpoint of adhesion of the conductive film to the base fabric 10, it is preferable to use a vacuum drying method for the solvent removal step. For example, if DMF is used as the aprotic solvent 23 and PET fiber is used as the synthetic fiber, the boiling point of DMF is 153°C, so drying conditions of 150°C or higher are required to remove DMF from the PET fiber. However, if heated above the glass transition temperature of PET fiber, 70°C, DMF will penetrate the crystalline structure of the PET fiber, degrading the physical properties of the PET fiber. Therefore, it is preferable to use vacuum drying and remove the solvent at a temperature of 70°C or lower. When drying, the PET fiber swollen by DMF shrinks back to its original state, further strengthening the adhesion at the interface between the PET fiber and the CNT. By the above method, a fiber structure 1 can be obtained.

[0032] As described above, the manufacturing method of the fiber structure 1 according to this embodiment includes a CNT dispersion immersion step in which a base fabric 10 is immersed in a CNT dispersion 24 in which CNTs 25 are dispersed in an aprotic solvent 23. Furthermore, the manufacturing method includes a solvent removal step after the CNT dispersion immersion step in which the base fabric 10 to which the CNT dispersion has adhered is dried and the aprotic solvent is removed. According to the manufacturing method of the fiber structure 1 according to this embodiment, it is possible to provide a manufacturing method of a fiber structure in which CNTs 25 are firmly attached to the base fabric 10 and conductivity is improved.

[0033] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0034] [Examples] In Examples 1 and 2, PET fiber (Calcuro) was used as the synthetic fiber. Test samples of base fabric constructed with smooth knit using PET fiber were prepared. On the other hand, as Comparative Example 1, a test sample of base fabric woven in a plain weave structure using the same PET fiber as in the examples was prepared. A plain weave structure consists of warp threads that extend and are arranged in the longitudinal direction, and weft threads that pass back and forth in the transverse direction, either above or below the warp threads. Furthermore, as Comparative Example 2, a test sample of base fabric constructed with smooth knit was prepared using PET fiber with a general round cross-sectional shape different from that of the examples. Each test sample was then cut with a hot slide cutter to prevent the fibers from unraveling from the ends. Hereafter, the test samples of base fabric in this state will be referred to as the test samples before immersion in the CNT dispersion.

[0035] Figures 6A and 6B show photographs of the test samples used in Example 1 and Example 2 before immersion in the CNT dispersion. On the other hand, Figures 7A and 7B show photographs of the test samples used in Comparative Example 1 before immersion in the CNT dispersion. In Example 1 and Example 2, the smooth knitted base fabric showed increased interfiber voids as the basis weight increased. On the other hand, in Comparative Example 1, the plain weave base fabric showed decreased interfiber voids as the basis weight increased.

[0036] The CNT dispersion immersion process was carried out on the test samples prepared as described above before immersion in the CNT dispersion. SWCNTs and DMF (a non-protic solvent) without a dispersant were prepared as raw materials for the CNT dispersion. OCSiAl's TUBALL® (outer diameter 1.6 ± 0.4 nm, length ≥ 5 μm) SWCNTs were used. The CNT dispersion was prepared by dispersing SWCNTs in DMF using an ultrasonic homogenizer to a SWCNT content of 0.1 mass%. The ultrasonic homogenizer was operated under conditions of a 10-second pulse cycle and a vibration amplitude of 40%, for 30 minutes.

[0037] Each test sample was immersed in a CNT dispersion using a ball mill. The ball mill settings were 350 rpm for 30 minutes. This immersion in the CNT dispersion was repeated several times.

[0038] Next, a solvent removal process was performed on each test sample after the CNT dispersion immersion step. The test samples with the CNT dispersion adhering to them were dried by vacuum drying at approximately 26°C for approximately 6 hours to remove the DMF. Hereafter, test samples in this state will be referred to as test samples after CNT dispersion immersion.

[0039] The sheet resistance of the test samples prepared as described above, after immersion in the CNT dispersion, was measured using the Van der Pauw method. As shown in Figure 3, the magnitude of the current when a current power supply was connected between two terminals and the resistances R1 and R2 due to the potential difference between the other two terminals were determined, and the correction coefficient f, which is determined by the ratio of resistances R1 and R2 (R1 > R2), was obtained from a numerical table. Then, the sheet resistance Rs (Ω / Sq.) was calculated by solving the following equation (1). Rs=(π / ln2)·(R1+R2) / 2·f(R1 / R2) (1)

[0040] The amount of CNTs attached was calculated by determining the increase in mass of the test sample after immersion in the CNT dispersion compared to the mass of the test sample before immersion in the CNT dispersion, resulting in the CNT attachment amount Δm(mg).

[0041] Figure 5 shows the measurement results of sheet resistance and CNT adhesion amount relative to basis weight for Example 1 and Comparative Example 1. For Example 1, the basis weight was 129 g / m². 2 or 266g / m² 2 The sheet resistance in this case is shown. In Example 1, as the basis weight increased, the amount of CNTs attached also increased, and the sheet resistance decreased significantly. This is thought to be because, as mentioned above, in a smooth knit base fabric, as the basis weight increases, the gaps between fibers increase, and the increased gaps lead to an increase in the amount of CNTs attached, thus decreasing the sheet resistance.

[0042] On the other hand, for Comparative Example 1, the basis weight was 134 g / m². 2or 273g / m² 2 The sheet resistance in this case is shown. In Comparative Example 1, the amount of CNTs attached decreased and the sheet resistance increased as the basis weight increased. This is thought to be because, as mentioned above, in a plain weave base fabric, as the basis weight increases, the gaps between fibers decrease, resulting in CNTs adhering only to the surface. Furthermore, in a plain weave structure, CNTs do not adhere to the areas where the warp and weft threads intersect when immersed in a CNT dispersion, so it is thought that the sheet resistance tends to be higher compared to a smooth knit structure.

[0043] Figures 8A and 8B show photographs of the test samples after immersion in the CNT dispersion used in Example 1 and Example 2. On the other hand, Figures 9A and 9B show photographs of the test samples after immersion in the CNT dispersion used in Comparative Example 1. In the smooth knit structure base fabrics of Example 1 and Example 2, the amount of CNT adhesion is thought to have increased because the number of voids between fibers increased with increasing basis weight. On the other hand, in the plain weave structure base fabric of Comparative Example 1, the amount of CNT adhesion is thought to be less likely to increase because the number of voids between fibers decreases as the basis weight increases.

[0044] The photograph on the left of Figure 10A shows the test sample of Example 1 after immersion in the CNT dispersion. On the other hand, the photograph on the right of Figure 10A shows the test sample of Example 1 after unraveling the knit of the sample after immersion in the CNT dispersion. As can be seen, the SWCNTs are entangled and attached to the smooth knit structure of the PET fibers, and the CNTs are uniformly attached to the inside of the base fabric.

[0045] The photograph on the left in Figure 10B shows the test sample of Comparative Example 1 after immersion in the CNT dispersion. On the other hand, the photograph on the right in Figure 10B shows the test sample of Comparative Example 1 after unraveling the weave after immersion in the CNT dispersion, with the white areas indicating areas where CNTs are not attached. These areas where CNTs are not attached exist because CNTs did not adhere to the points where the warp and weft threads intersect in the plain weave structure, and are considered to be the reason why the sheet resistance was higher compared to Example 1, which had a smooth knit structure.

[0046] Figure 11A shows the measurement results of sheet resistance as a function of basis weight for Example 2 and Comparative Example 2. Figure 11B also shows the measurement results of CNT adhesion as a function of basis weight for Example 2 and Comparative Example 2. In Example 2, similar to Example 1, the amount of CNT adhesion increased and the sheet resistance decreased as the basis weight increased. This is thought to be because, in a smooth knit base fabric, as the basis weight increases, the gaps between fibers increase, and these increased gaps increase the amount of CNT adhesion, thus decreasing the sheet resistance. Furthermore, Example 2 showed less variation in sheet resistance compared to Comparative Example 2. This is thought to be due to the stable entanglement of CNTs in the special fiber shape of Calquro, as shown in Figure 12. On the other hand, in Comparative Example 2, no increase in CNT adhesion was observed even as the basis weight increased, and there was a tendency for the sheet resistance to increase. This is thought to be because, as shown in Figure 13, there was less entanglement of CNTs in the round cross-section PET fibers, and therefore the effect of the smooth knit structure, where the gaps between fibers increase as the basis weight increases, could not be utilized.

[0047] These results show that, according to the fiber structure 1 of this embodiment, a fiber structure can be obtained in which CNTs are firmly attached to the base fabric and the conductivity is improved.

[0048] Although this embodiment has been described above, this embodiment is not limited to these, and various modifications are possible within the scope of the gist of this embodiment. [Explanation of Symbols]

[0049] 1. Fiber structure 10 Base fabric 23 Aprotic solvents 24. Carbon nanotube dispersion (CNT dispersion) 25 Carbon nanotubes (CNTs)

Claims

1. A base fabric made of synthetic fibers having grooves on its surface and an irregular cross-sectional shape, which are knitted in a smooth weave, Carbon nanotubes attached to the aforementioned base fabric, A fibrous structure comprising the above.

2. The basis weight of the aforementioned base fabric is 80 to 300 g / m². ２ The fiber structure according to claim 1.

3. The fiber structure according to claim 1 or 2, wherein the synthetic fiber is a polyester fiber.

4. A method for manufacturing a fiber structure according to claim 1 or 2, A carbon nanotube dispersion immersion step involves immersing the base fabric in a carbon nanotube dispersion, which is obtained by dispersing the carbon nanotubes in an aprotic solvent. Following the carbon nanotube dispersion immersion step, a solvent removal step is performed to dry the base fabric to which the carbon nanotube dispersion has adhered and to remove the aprotic solvent. A method for manufacturing a fibrous structure having the following characteristics.

5. The method for producing a fiber structure according to claim 4, wherein the aprotic solvent is N,N-dimethylformamide.

Images