KR101562477B1 - Fabrication method of Woven Carbon Fiber/Polyester Composites improved Mechanical Properties by Controlled Growth of CuO Nanowires and The same Composites - Google Patents

Abstract

In the present invention, an effect of a copper oxide (CuO) nanowire is researched for improvement of mechanical properties of a polyester resin composite based on a woven carbon fiber (WCF). The composite is manufactured by a vacuum-assisted resin transfer molding (VARTM) process. The copper oxide nanowire is grown by next process on the woven carbon fiber in continuous steps of seeding. A scanning electron microscope (SEM) shows growth of the copper oxide nanowire on the surface of the carbon fiber. The growth increases upon the number of seeding cycles and length of growing time. A crystal line peak of the copper oxide nanowire is increased with the growth of the nanowire. A new absorption peak shown in FTOR spectrum also presents growth of the copper oxide nanowire on the WCF.

Description

TECHNICAL FIELD The present invention relates to a method for producing a woven carbon fiber / polyester composite having improved mechanical properties by controlled growth of copper oxide nanowires, Composites}

The present invention relates to a method for producing a woven carbon fiber / polyester composite and a composite thereof, and more particularly, to a method for producing a woven carbon fiber / polyester composite, To a process for producing a woven carbon fiber / polyester composite improved in mechanical properties such as tensile properties and impact absorption by appropriately controlling the number of carbon fibers / polyester composites.

Copper oxide (CuO) is widely used as a one-dimensional p-type semiconductor material with a narrow bandgap of 1.2Ev and having different forms such as nanowires and nanorobes. CuO has exceptional physical properties and is used for many applications in the fields of electronics and optics required by piezoelectric, superconductors, and coarse resistors. CuO has a wide range of applications including gas sensors, field emitters, storage devices, and rectifiers, as well as various acoustic products. Between different synthesis routes such as thermal decomposition, thermal evaporation, solid phase reaction, autocatalyst growth, and solution-based techniques, hydrothermal processes are most suitable. The gas phase synthesis method consumes expensive equipment and a large amount of energy during the process. Solution-based technology is limited by toxic solvents and high temperature requirements. However, the hydrothermal method is free of major limitations and has a versatile synthesis that is cost effective, low energy consumption, safe and environmentally advantageous.

Over the past several decades, nanocomposites have attracted potential attention in many areas. Polymers reinforced with nanomaterials have received particular attention due to their unique improvements in mechanical properties such as strength, modulus, impact behavior, external surface stiffness and toughness. The inventor has already used whiskers for carbon fiber, glass fiber, cellulosic fiber and fiber reinforced materials for complex development. However, although different forms of carbon nanotubes, graphene oxides and other fillers are also used to enhance the properties of the polymer matrix, in each case the properties do not improve to the required level. In order to obtain an efficient reinforcing material, the filler must have a large proportion aspect, good alignment and sufficient dispersion in the polymer matrix. Without the presence of these parameters, the complexes lead to defective products. Furthermore, obviously, the fiber matrix interface is equally important in determining the overall capabilities of the composite. The strong fiber matrix interface leads to efficient load transfer, thereby improving the ability of the composite.

Sometimes, the interaction of the interfaces is not enough to obtain the required properties. In such cases, the alternative means must be applied to improve the stress transfer as well as the interface strength. This enables the development of multiscale hybrid composites using nanoscale whiskers, nanotubes, nanorods, and more than one reinforcing filler that contains nanowires on the surface of the fibers. The arrangement of these components widens out of the matrix, increases the surface area for bonding, and improves load transfer at the fiber matrix interface. For example, we have developed hybrid composites of carbon nanotubes grown on the surface of carbon fibers, such as Mathur, and observed significant improvements in bending strength and bending modulus. CuO nanowires are expected to exhibit strong interfacial interactions with carbon fibers. They also react with polar functional groups such as carboxyl, hydroxyl and carbonyl present on the surface of the carbon fibers. Their strong affinity results in strong tie forces within the composite that dramatically improve the amount of properties required as they react with the polymer bonds of the resin.

Korean Patent Publication No. 10-2014-0014700 Korean Patent Publication No. 10-2014-0091153

SUMMARY OF THE INVENTION The present invention has been made in order to solve all of the above problems, and it is an object of the present invention to provide a method of manufacturing a semiconductor device, To provide a method of making a carbon fiber / polyester composite woven to improve the impact strength and tensile strength of carbon fiber-based polymer composites by growing the nanowires.

Another object is to provide a woven carbon fiber / polyester composite which is made using the one produced by the above-mentioned manufacturing method.

In order to achieve the above object, the present invention provides a method for producing a woven carbon fiber / polyester composite having improved mechanical properties by controlled growth of copper oxide nanowires, Characterized in that the woven carbon fiber (WCF) having the Cu (Cu) nanowires grown thereon is combined with a polyester.

The growth of the copper oxide nanowire is preferably performed by growing copper nanoparticles grown on the woven carbon fiber with nanowires.

Further, it is preferable that the woven carbon fiber (WCF) is combined with a polyester by a vacuum auxiliary resin deformation molding (VARTM) process.

The growth of the CuO nanowires is achieved by repeating a seeding cycle several times at a constant concentration of growth solution and growth time, the concentration of the growth solution is 10 to 60 Mm, the growth time is 5 To 8 hours, the number of seeding cycles is 5 to 8 seeding cycles, and the growth time of the growth solution is 8 hours, and the seeding cycle is preferably 8 seeding cycles.

In the growth solution of copper acetate monohydrate _{((Cu (CH 3 COO)} 2 .H 2 O) is sodium hydroxide (NaOH) dissolved in ethanol is added and the final solution was prepared in, to prepare the growth solution to the desired concentration (Zn (NO ₃ ) ₂ .H ₂ O) and hexamethylenetetramine (C ₆ H ₁₂ N ₄ , HMTA) mixed in a molar ratio of 1: 1 to the final solution .

The pH of the growth solution is preferably maintained at 6 to 8.

And further contributes to the improvement of the mechanical properties by the reaction of the polar functional group of the surface of the carbon fibers with the polyester resin.

It is also preferred that the polar functional group on the surface of the carbon islands is carboxyl, hydroxyl and carbonyl.

Another feature of the present invention is to use a woven carbon fiber / polyester composite produced by the above production method.

According to the method for producing a woven carbon fiber / polyester composite in which the mechanical properties are improved by controlled growth of the copper oxide nanowire of the present invention and the composite thereof,

1 is a schematic diagram of a CuO nanowire grown on the surface of a WCF
Figure 2 is a process schematic diagram of a VARTM fabricating a CuO nanowire / polyester WCF composite.
FIG. 3 is a scanning electron microscopic microstructure photograph of WCF samples after hydrothermal treatment under different conditions.
Figure 4 shows scanning electron microscopic microstructure photographs of WCF samples after growth of CuO nanowires under different reaction conditions.
Figure 5 shows the change in the weight ratio of CuO nanowires grown on the surface of WCF
Figure 6 shows XRD analysis of CuO nanowire / polyester WCF composites under different growth conditions.
Figure 7 shows the FTIR spectra of WCF and WCF-CuO nanowires
Figure 8 shows the final strength and tensile modulus of WCF and CuO nanowire / polyester WCF composites
Figure 9 shows the stress-strain curves of WCF and CuO nanowire / polyester WCF composites
Figure 10 shows the total impact energy absorbed by WCF and CuO nanowire / polyester WCF composites

Hereinafter, a method for producing a woven carbon fiber / polyester composite having improved mechanical properties by controlled growth of copper oxide nanowires according to the present invention and preferred embodiments of the composite will be described in detail with reference to the accompanying drawings. It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to inform.

1. Introduction

In the present invention, CuO nanowire / polyester resin based Woven Carbon Fiber (WCF) composites were developed through cost-effective and time-efficient vacuum assisted resin transfer molding (VARTM) technology, Property can be guaranteed. The growth mechanism and optimal growth of CuO nanowires were investigated by scanning electron microscopy (SEM). The results were verified by using weight gain analysis, X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The effects of nanowire growth on the mechanical properties and impact resistance of the composites were also investigated. This will be described in detail as follows.

2. Experimental Method

2.1 Materials

Woven carbon fiber (WCF, T-300 grade) was obtained from Amoco (Chicago, IL, USA) and used as is. Aldrich (St. Louis, Mo., USA), copper acetate monohydrate (Cu (CH3COO) 2.H2O), copper nitrate tetrahydrate (Zn (NO3) 2.H2O), and hexamethylenetetramine (C6H12N4) Lt; / RTI > and used. The analytical grade of sodium hydroxide (Samcheon Pure Chemical Co., Ltd., Pyungtaek, Korea) and ethanol (J.T Baker, Phillipsburg, NJ, USA) were used as is.

2.2 Preparation of CuO seed solution and growth solution

0.02M Cu acetate monohydrate was dissolved in 400 ml of ethanol at 65 ° C followed by continuous stirring for 30 minutes. To the ethanol solution, 80 mL of 0.02 M NaOH was prepared at 65 DEG C for 30 minutes. This ethanol solution was then injected into the prepared copper acetate monohydrate solution. The total volume was adjusted to 800 ml by the addition of 320 ml of extra ethanol. The final solution was further stirred at room temperature for 30 minutes to ensure complete and constant mixing. The pH of the seed solution was measured and maintained at 5-6 to obtain efficient seeding. The resulting light blue solution containing a suspension of CuO particles was cooled at room temperature for 1 hour or more. The chemical reactions taking place in the CuO seed solution were as follows:

Cu^{2 +}+ 4OH^- ↔ [Cu (OH) 4]^2- (One)

^{[Cu (OH) 4] 2-} ↔ CuO 2 2 - + 2H 2 O (2)

CuO ₂ ^{2 -} + H ₂ O ↔ CuO 2 OH ^- (3)

CuO + OH ^- ↔ CuOOH ^- (4)

To prepare the CuO growth solution at the desired concentration, copper nitrate tetrahydrate and hexamethylenetetramine (C ₆ H ₁₂ N ₄ , HMTA) were mixed at a molar ratio of 1: 1. To prepare a 20 mM CuO growth solution, 20 mM HMTA was dissolved in 630 ml of distilled water for 10 minutes at room temperature. This led to the addition of 20 mM copper nitrate tetrahydrate. The entire solution was stirred for 30 minutes. The pH of the growth solution was maintained at 6-8. A similar procedure led to 30, 40, 50, 60 mM growth solutions. Their final solution was used to grow CuO nanowires in treated WCFs. The growth of CuO nanowires in WCF is shown in Fig. Chemical reactions involved in the growth of CuO and OH? And the synthesis of CuO from Cu ^{2 +} were as follows:

C₆H₁₂N₄ + 6H₂O ↔ 6HCHO + 4NH₃  (5)

4NH ₃ + H ₂ O ↔ NH ₄ ⁺ + OH ^- (6)

OH ^- + Cu ^{2 -} ↔ Cu (OH) ₂ (7)

Cu (OH) ₂ ↔ CuO + H ₂ O (8)

2.3 Fabrication of CuO / Polyester Woven Carbon Fiber Samples

Woven carbon fiber (WCF) samples were placed in the seed solution mentioned below, and then each was heated at 150 ° C for 10 minutes to remove solvents and other organic materials. This process was repeated for several cycles. Samples were placed in a stainless steel pressurized steriliser filled with growth solution followed by sealing. The pressurized sterilizer lasted for several hours at 90 ° C. After completion of this hydrothermal process, the samples were washed with ionized water to stop the growth of all layers of CuO. Finally, the fiber samples with the combined CuO nanowires were dried naturally for one day.

A vacuum assisted resin deformation molding (VARTM) process was used to prepare the final composite materials from CuO nanowire-grown fiber specimens. Unsaturated polyester resin was used in all samples. Figure 2 shows a systematic diagram of the VARTM process concluding with the seeding process and final preparation of the composite sample.

3. Results and Discussion

A robust experimental design was clearly demonstrated before starting a series of reactions of the CuO growth pattern on woven carbon fibers. Minitab 1.6 software was used to design experimental parameters. The following three parameters were considered during the experimental process: the number of seeding cycles (2, 4, 6 and 8), the concentration of growth solution (10, 20, 30, 40, 50 and 60 mM) Length (1, 3, 4, 5 and 8 hours). Depending on the respective results, the combinations of the various parameters are listed in Table 1.

3.1. Scanning electron microscope study

A preliminary investigation of the growth of CuO nanowires in woven carbon fiber (WCF) was performed using a scanning electron microscope (SEM; Nanonova 230; FEI, Hillsboro, OR, USA) at an operating voltage of 15 kV. Figure 3 shows a SEM image of WCF samples treated with a hydrothermal process for different treatment conditions. The inventors of the present invention have previously obtained CuO nanofibers well grown on polycarbonate bases by applying copper nuclei as seed carriers during the growth process. However, in the present invention, it was revealed that, despite the concentration of the growth solution and the growth time, there was no growth of CuO nanowires at two seeding cycles. Although the concentration and growth time of the growth solution were adequate, the nanowires did not grow due to a small number of seeding cycles. These results established the seeding process as an important parameter in the growth process. WCF samples with four seeding cycles and one hour of growth time did not show any growth of the CuO nanowires, even at growth solution concentrations of 40 and 50 Mm. The growth time of short nanowires played a major role because the seed nuclei did not have enough time to grow, even though the concentration of the growth solution was quite high.

An SEM image of CuO nanowires successfully grown on woven carbon fibers (WCF) is shown in FIG. From the following Table 1, almost all growth cycles of 4 or more showed meaningful growth of the nanowires. Although the growth solution concentration is not an important parameter, the length of the hydrothermal treatment plays a very important role. Zhang and others have successfully demonstrated the controllable growth of CuO nanostructures using an ethylene glycol-assisted hydrothermal process. Under all growth solution concentrations from 10 mM to 60 mM, CuO nanowires were successfully grown for all growth times greater than one hour. The maximum concentration of nanowires occurred during 8 seeding cycles and 8 hours of growth time. Therefore, the growth process was mainly dependent on seeding cycle and growth time. The nanowires were grown at almost all growth solution concentrations.

* Combination of each parameter and result

3.2. Weight gain

The weight change of the woven carbon fiber (WCF) samples after successful growth of the CuO nanowires is shown in FIG. With the seeding cycle increasing and decreasing, the growth of CuO nanowires occurred in almost all cases except for sample (e). The low growth of nanowires in sample (e) was due to very low growth time compared to other samples. With more than four hours of growth time, all samples showed fairly good weight changes. Samples with 8 seeding cycles and 8 hours of growth time had the largest proportion of weight change. The growth solution concentration had only marginal effects. These results support the results discussed in Section 3.1.

3.3 X-ray diffraction analysis

Figure 6 shows an X-ray diffraction pattern of WCF samples with no CuO nanowire growth in WCF samples. These were obtained with a wide-angle X-ray diffractometer (Bruker, Billerica, MA, USA) using crystalline monochromate CuKα radiation in an angular range of 20 to 80 ° (2θ) with a current of 20 mA and an operating voltage of 40 kV. The large diffraction peaks observed at 25.8 ° (002) were due to the presence of carbon in the carbon fiber. However, due to the growth of CuO nanowires on the surface of WCF, the (110), (111), (-111), (-202), (020), (202), (-113) 220 and (004), respectively. The intensity of the diffraction peak increased with the concentration of CuO nanowires. With 8 seeding cycles, a concentration of growth solution of 60 mM and a growth time of 8 hours, WCF resulted in the highest diffraction peak followed by a sample with 8 seeding cycles, a growth solution concentration of 40 mM and an 8 hour growth time. These results provide evidence of further CuO nanowire growth at the surface of the WCF.

3.4. Fourier transform infrared (FTIR) analysis

FTIR analysis was performed using a 670IR (Agilent, USA) spectrometer. Figure 7 shows FTIR spectra for woven carbon fibers (WCF) with and without woven carbon fibers (WCF) with CuO nanowires. The broad absorption peaks appearing between 3200 and 3500 cm ^-1 were mainly due to the presence of hydroxyl, carboxyl and moisture on the carbon fiber surface. At 2921 and 2856 cm ^-1 the peak was attributed to -CH stretching of the methylene group. The peaks at 3433, 2924 and 2851 cm ^-1 of the WCF-CuO nanowire were attributed to the surface hydroxyl group and the methylene group surface. Moreover, the absorption of water molecules at the surface of CuO nanowires was characterized by a peak at 3433 cm ^-1 . At 1632, 1427, 1361, and 1082 cm ^-1 , the surface carboxyl group had a peak at 1722 cm ^-1 , which meant the bonding of carbon fiber to CuO, whereas the new peak was attributed to the stretching vibration of C = C and CO . The peak at 617 cm ^-1 was the result of Cu-O stretching in the [? 101] direction. The peak at 531 cm ^-1 was due to the Cu-O stretching along the [101] direction of the WCF-CuO nanowire.

3.5. Tensile test

The tensile test of the specimens was performed using an Instron 5982 universal testing machine with a maximum load of 100 kN. Five specimens were tested for each sample at a displacement rate of 2 mm / min in accordance with ASTM D3039 standard. Average values are recorded here. The tensile modulus and tensile strength results are shown in Fig. WCF-reinforced polyester composite samples without CuO nanowires had the lowest strength and coefficient values because these samples also had the lowest degree of interfacial interaction between the fibers and the resin. As the CuO nanowires were included on the surface of the carbon fibers, the surface area of the fibers increased.

The stress-strain curve of the WCF composite and the CuO nanowire / CF / polyester composite is also shown in FIG. The amount of increase corresponds directly to the degree of interaction between the carbon fiber and the polyester resin. These results show a general trend of increasing strength and counting values: more CuO nanowire growth has resulted in improved results. Early research shows that external impact energy causes fiber breakage in fragile composites. The higher growth rate of CuO nanowires leads to increased energy demand for more efficient load sharing, fiber breakage by the nanowires with the fibers.

Composites with CuO nanowires grown at 8 seeding cycles and 8 hour growth times using a 60 mM growth solution concentration resulted in a maximum modulus (33.1%) and strength (42.8%). However, surface functional groups (e.g., hydroxyl, carboxyl, and carbonyl) of carbon fibers have also reacted with the ester groups of nanowires and polyester resins, as discussed earlier. These extra interface interactions significantly increased the overall tensile strength of the final composite. Galan, et al., Have improved the mechanical properties of carbon fiber / resin composites caused by modifying metal oxide nanowires. Furthermore, the seeding process of CuO nanowires leads to the self-assembly of CuO nanoparticles at the functional location of carbon fibers, which increases ionic bonding through the interfacial area. As a result, the CuO nanowire-entangled network leads to higher interfacial properties as the shear strength of the interface increases. This network increases load transfer from the resin matrix in the fiber and protects the fiber from breakage.

3.6. Impact test

As with Mi, we observed an increase in intrinsic toughness when metal nanowires were grown on a polyurethane base. Therefore, impact energy absorption studies were performed using an Instron 5982 drop-weight impact tester (Norwood, MA, USA). Before starting, a circular clamp was placed with a diameter of 40 mm. The data were collected between the initial impact contact point and the penetration point. The data can also be calculated from the weight capacity of the test apparatus at maximum impact. The impact energy was measured by the combination of repulsion and absorption energy. When ignoring the repulsive energy, all energy was completely absorbed by the resin and fiber.

Delamination energy and coupled strain energy were included in the energy absorbed during the low velocity impact. However, the fragile nature of the composite leads to a minimum level of absorption energy when the fiber is broken. The remaining energy, including shear-out energy, total strain energy and delamination energy, was absorbed through the impact energy of the specimen. Figure 10 shows the impact energy absorption results of WCF without CuO nanowires and WCF / CuO nanowire / polyester resin composite specimens. WCF specimens without CuO nanowires had the lowest impact energy absorption. The impact energy absorption increased to 7.2% with minimal growth of CuO nanowires in WCF and continued to increase with the growth of CuO nanowires.

As the growth of the CuO nanowires increased, they increased in a linear fashion, enhancing the interaction of the CuO nanowires with the surface and also with the carbon fibers and the matrix. These interactions lead to strong entanglement within the complex, which can absorb and pass enough energy through the interface. 8 seeding cycles, growth time of 8 hours and growth solution concentrations of 40 and 60 mM had the highest CuO nanowire growth, as described above, and therefore 124.7% and 136.8%, respectively, compared to WCF specimens without CuO nanowires. The maximum efficiency against the impact energy was obtained.

Furthermore, the affinity of surface functional groups shows that carbon fibers play an important role in improving properties. The surface of the carbon fiber naturally includes carboxyl, hydroxyl and carbonyl groups. The hydroxyl and carboxyl groups interact with the Cu ^{2 +} ions of CuO resulting in the formation of strong ionic bonds. The extra long pair shown in the carboxyl group also shows a strong affinity towards CuO. Moreover, the functional groups also react with the ester groups of the polyester resin to form strong bonds. Thus, bonding these factors, carbon fiber and polyester resin, improved the overall impact absorption energy of the final composite.

4. Conclusion

Copper oxide (CuO) nanowires contained in woven carbon fiber (WCF) based polyester resin composites were developed using the VARTM process. Prior to the VARTM process, copper oxide (CuO) nanoparticles were planted on carbon fibers, and nanoparticles were allowed to grow into nanowires on the surface of carbon fibers. Regardless of the concentration of the growth solution or the length of the growth time, the scanning electron microscope revealed that the nanowire did not grow when it was only two seeding cycles. Except in one case where the growth time (1 hour) was very short, the nanowires grew with a seeding cycle of 4 to 8. The maximum growth of nanowires occurring during 8 seeding cycles, 60 mM growth solution concentration, and 8 hour growth period was observed from analyzing SEM images and changes in weight gain. X-ray diffraction analysis was performed over a range of 20 to 80 degrees of 2 &thetas;. The remarkable growth of nanowires on the carbon fiber surface was confirmed by evaluating new peaks at different levels. The results of FTIR (Fourier transform infrared) spectroscopy show the growth of copper oxide (CuO) nanowires on the surface of carbon fibers. In terms of strength (42.8%) and modulus (33.1%), the tensile properties increased compared to surfaces without CuO nanowires after growth of copper oxide (CuO) nanowires on carbon fibers. The impact energy absorption increased to 136.8% in the sample for maximum growth of copper oxide (CuO) nanowires. Improved interfacial interaction between nanowires, woven carbon fibers, and polyester resins was a major cause of the consequences. However, the interaction of functional groups that appear on carbon fibers between copper oxide (CuO) nanowires and epoxy resins has also been a key factor in this area of interest.

As described above, the method of producing a woven carbon fiber / polyester composite having improved mechanical properties by controlled growth of copper oxide nanowires according to the present invention and a composite thereof have been described with reference to the drawings. However, It is to be understood that the invention is not limited to the disclosed embodiments and drawings, and that various modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims (11)

Characterized in that the woven carbon fiber (WCF) is produced by combining the woven carbon fiber (WCF) on which a copper oxide (Cuo) nanowire is grown on the surface of woven carbon fiber (WCF) A method of making a woven carbon fiber / polyester composite having improved properties. The method according to claim 1,
Characterized in that the growth of the copper oxide nanowires is achieved by growing copper nanoparticles grown on the woven carbon fibers with nanowires, wherein the woven carbon fiber / polyester composite improved mechanical properties by controlled growth of the copper oxide nanowires . The method according to claim 1,
Characterized in that the woven carbon fiber (WCF) and the polyester are combined by a vacuum assisted resin transformation molding (VARTM) process. The woven carbon having improved mechanical properties by controlled growth of the copper oxide nanowire Fiber / polyester composite. The method according to claim 1,
Characterized in that the growth of the copper oxide (Cuo) nanowire is carried out by repeating a seeding cycle several times at a certain concentration of a growth solution and at a growth time, and the mechanical properties are improved by controlled growth of the copper oxide nanowire A method of making a woven carbon fiber / polyester composite. 5. The method of claim 4,
Wherein the concentration of the growth solution is 10 to 60 Mm, the growth time is 5 to 8 hours, and the seeding cycle of several times is 5 to 8 seeding cycles. / RTI > carbon fiber / polyester composite. 6. The method of claim 5,
Wherein the growth time of the growth solution is 8 hours and the seeding cycle is 8 seeding cycles. The method of producing a woven carbon fiber / polyester composite with enhanced mechanical properties by controlled growth of copper oxide nanowires. 5. The method of claim 4,
The growth solution is copper acetate monohydrate _{((Cu (CH 3 COO)} 2 .H 2 O) is sodium hydroxide (NaOH) dissolved in ethanol is added and the final solution was prepared in order to prepare the growth solution to the desired concentration (Zn (NO ₃ ) ₂ .H ₂ O) and hexamethylenetetramine (C ₆ H ₁₂ N ₄ , HMTA) mixed in the final solution at a molar ratio of 1: 1 Characterized in that the mechanical properties of the woven carbon fiber / polyester composite are improved by controlled growth of copper oxide nanowires. 8. The method of claim 7,
Wherein the pH of the growth solution is maintained at 6 to 8. The method of claim 1, wherein the pH of the growth solution is maintained at 6 to 8 by controlling growth of the copper oxide nanowires. The method according to claim 1,
Wherein the functional groups of polar functional groups on the surface of the carbon fibers and the polyester resin contribute to the improvement of the mechanical properties by the reaction between the functional groups of the carbon fibers and the polyester resin. / RTI > 10. The method of claim 9,
Characterized in that the polar functional group on the surface of said carbon islands is carboxyl, hydroxyl and carbonyl. Woven carbon fibers with improved mechanical properties by controlled growth of copper oxide nanowires / Polyester < / RTI > A woven carbon fiber / polyester composite improved in mechanical properties by controlled growth of copper oxide nanowires using the composite produced by the method of any one of claims 1 to 10.

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