KR101816173B1 - Nano complex body being a combination of single wall carbon nano tube and cellulose fiber - Google Patents
Nano complex body being a combination of single wall carbon nano tube and cellulose fiber Download PDFInfo
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- KR101816173B1 KR101816173B1 KR1020160010640A KR20160010640A KR101816173B1 KR 101816173 B1 KR101816173 B1 KR 101816173B1 KR 1020160010640 A KR1020160010640 A KR 1020160010640A KR 20160010640 A KR20160010640 A KR 20160010640A KR 101816173 B1 KR101816173 B1 KR 101816173B1
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/285—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acid amides or imides
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
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- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
- D06M11/74—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/01—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural macromolecular compounds or derivatives thereof
- D06M15/03—Polysaccharides or derivatives thereof
- D06M15/05—Cellulose or derivatives thereof
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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Abstract
The nanocomposite comprising the single-walled carbon nanotube and the cellulose fiber according to an embodiment of the present invention includes a single-walled carbon nanotube and a polyacrylamide (PAM) aqueous solution and a poly ethylene oxide (PEO) Wherein the volume ratio of the polyacrylamide (PAM) aqueous solution to the polyethylene oxide (PEO) aqueous solution is 1:10 to 1: 3.
Description
The present invention relates to a nanocomposite in which a single-walled carbon nanotube and a cellulose fiber are combined, and more particularly, to a nanocomposite comprising a high molecular weight polyethylene oxide (PEO) and a polyacrylamide (PAM).
Carbon nanotubes are a new material in which carbon is connected to each other to form a hexagonal honeycomb pattern and form a tube. The diameter of the tube is extremely small to the nanometer level. Carbon nanotubes are available in two symmetrical configurations known as zigzag and armature. In practice, most carbon nanotubes have a chiral structure spirally arranged along a honeycomb-shaped hexagonal tube axis instead of this symmetrical structure. Carbon nanotubes have a graphite surface that is rounded to a diameter of nanometer size and exhibits the characteristics of metals or semiconductors depending on the angle and structure of the graphite surface. In addition, according to the number of the bonds forming the wall, single wall carbon nanotubes (SWCNT), double wall carbon nanotubes (DWCNT), multiwall carbon nanotubes (MWCNT), and multicarbon carbon nanotubes (RCNT) are distinguished.
Particularly, metals such as copper, iron, nickel, aluminum, tin, zinc and the like having good electromagnetic characteristics have been spotlighted as shielding materials, but the metals are generally heavy, have poor processability and cause corrosion. Conductive polymers have been proposed as substitute materials.
However, conductive polymers have a disadvantage in that they have poor thermal stability and conductivity is lower than that of metal. Therefore, various conductive composites are being studied to increase conductivity and shielding ratio. As a part of this research, researches using carbon nanofibers and carbon nanotubes, which are excellent in mechanical and electrical properties, as a filler of composites are being actively carried out.
Cellulose is an eco-friendly polymer that is abundant in nature and reusable. Recently, concerns about pollution and depletion of petroleum resources have increased, and interest in renewable polymers is increasing. In the case of traditional Korean paper, which is superior in mechanical strength, cellulose is the main component, and active research is needed on how to utilize the composite material obtained by bonding between carbon nanotubes and environmentally friendly high molecular materials.
It is an object of the present invention to provide an environmentally friendly nanocomposite which is capable of conducting and shielding by using a nanocomposite comprising a single wall carbon nanotube (SWCNT) dispersion and cellulose fibers.
The nanocomposite comprising the single-walled carbon nanotube and the cellulose fiber according to an embodiment of the present invention includes a single-walled carbon nanotube and a polyacrylamide (PAM) aqueous solution and a poly ethylene oxide (PEO) Wherein the volume ratio of the polyacrylamide (PAM) aqueous solution to the polyethylene oxide (PEO) aqueous solution is 1:10 to 1: 3.
Here, the volume ratio of the polyacrylamide (PAM) aqueous solution and the polyethylene oxide (PEO) aqueous solution may be 1: 7.
The polyacrylamide in the polyacrylamide (PAM) aqueous solution may be 0.2 wt%, and the polyethylene oxide in the polyethylene oxide (PEO) aqueous solution may be 0.2 wt%.
The cellulose fibers may be cellulose fibers having a fiber length of 7.4 to 23.8 mm and a fiber width of 10 to 20 탆.
A method for preparing a nanocomposite according to an embodiment of the present invention comprises the steps of immersing cellulose fibers in distilled water, mixing aqueous solution of polyacrylamide (PAM) and aqueous solution of polyethylene oxide (PEO) in distilled water containing cellulose fibers, And mixing the nanotube dispersion.
Here, the step of mixing the aqueous solution of polyacrylamide (PAM) with the aqueous solution of polyethylene oxide (PEO) in the distilled water containing the cellulose fibers may be carried out by mixing the aqueous solution of polyacrylamide (PAM) and the aqueous solution of polyethylene oxide (PEO) 1: 3 by volume ratio.
The step of mixing the polyacrylamide (PAM) aqueous solution and the polyethylene oxide (PEO) aqueous solution into the distilled water containing the cellulose fibers is carried out by mixing a polyacrylamide (PAM) aqueous solution and a polyethylene oxide (PEO) aqueous solution at a ratio of 1: 7 Mixing < / RTI >
The nanocomposite according to the embodiment of the present invention can manufacture a shielding agent having an excellent shielding effect, and there is no fear of environmental pollution by using an eco-friendly process and an eco-friendly material.
1 is a graph showing a result of electromagnetic wave shielding of a nanocomposite according to an embodiment of the present invention.
2 is a flow chart of a method of manufacturing a nanocomposite according to an embodiment of the present invention.
It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are presented for the purpose of describing embodiments only in accordance with the concepts of the present invention, May be embodied in various forms and are not limited to the embodiments described herein.
Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that there is no intention to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes modifications, equivalents, or alternatives falling within the spirit and scope of the present invention.
The terms first, second, or the like may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, Similarly, the second component may also be referred to as the first component.
It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Expressions that describe the relationship between components, for example, "between" and "immediately" or "directly adjacent to" should be interpreted as well.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ", or" having ", and the like, are used to specify one or more of the features, numbers, steps, operations, elements, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a nanocomposite comprising a single-walled carbon nanotube and a cellulose fiber according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
The nanocomposite comprising the single-walled carbon nanotube and the cellulosic fiber according to the embodiment of the present invention may be a single-walled carbon nanotube (SWCNT), a polyacrylamide (PAM) aqueous solution and a poly ethylene oxide (PEO) aqueous solution, wherein the volume ratio of the polyacrylamide (PAM) aqueous solution to the polyethylene oxide (PEO) aqueous solution is 1 : 10 ~ 1: 3. Preferably a volume ratio of 1: 7.
Single-Walled Carbon Nanotubes are a type of carbon nanotubes called single-walled carbon nanotubes (SWCNTs) and have a diameter of 1.2 to 3 nm, a tension of 45 GPa or less, a density of 1.33 to 1.4 g / cc, -6 Ω · m, a current density of 109 A / m 2 or less, and a thermal conductivity of 6000 W / m · K or less.
The cellulosic fiber may be cellulose fibers having a fiber length of 7.4 to 23.8 mm and a fiber width of 10 to 20 탆, and may be cellulose fibers used in the manufacture of Korean paper.
The polyacrylamide (PAM) aqueous solution is a liquid material containing a polyacrylamide (PAM) polymer, and the polyacrylamide functions as a dispersing agent for dispersing the cellulose fiber. Cellulosic fibers make up a piece of paper in the form of thin, multi-threaded twisted chains. When the aqueous solution of polyacrylamide is brought into contact with the cellulose fibers, the multiple fine threads are loosened and the bonds between them are released.
The polyethylene oxide (PEO) aqueous solution is a liquid material containing a polyethylene oxide (PEO) polymer. The polyethylene oxide (PEO) binds negatively charged substances on the surface of the material to neutralize or positively charge the material surface And the like.
<Experimental Example>
The nanocomposite comprising the single-walled carbon nanotube and the cellulose fiber according to an embodiment of the present invention includes a single-walled carbon nanotube and a polyacrylamide (PAM) aqueous solution and a poly ethylene oxide (PEO) The zeta potential was measured to predict the amount of charge on the surface of the carbon nanotube and on the surface of the cellulose fiber as a nanocomposite comprising a single-walled carbon nanotube and a cellulose fiber including a sample made of an aqueous solution.
(0.2 wt%), a polyacrylamide (PAM) aqueous solution (0.2 wt%), and a polyethylene oxide (PEO) aqueous solution (0.2 wt%). ) To prepare a nanocomposite.
<Zeta potential measurement result>
As a parameter for measurement, the zeta potential was measured while varying the volume of the polyacrylamide (PAM) aqueous solution and the polyethylene oxide (PEO) aqueous solution.
(mV)
The carbon nanotubes are dispersed using SDS, and the surface charge of the carbon nanotubes is negatively charged. In addition, when cellulose is dispersed in a polyacrylamide (PAM) aqueous solution, the cellulose surface is also negatively charged.
In this process, the carbon nanotubes and the cellulose are charged with the same polarity, and the carbon nanotubes do not stick to the cellulose surface. These results can be confirmed by measuring the zeta potential in the case of PAM: PEO = 1: 0. That is, the total average power is -23.26, which is charged to a slightly higher negative charge.
Also, as expected, PAM: PAO = 3: 1 and 1: 1 can not overcome the polarities of carbon nanotubes and cellulosic fiber surfaces and prevent carbon nanotubes from adhering to the surface of cellulosic fibers.
On the contrary, when the volume of aqueous solution of polyethylene oxide (PEO) which is neutralized or positively charged with surface charge by PAM: PEO = 1: 3 is larger than the volume of aqueous solution of polyacrylamide (PAM), the zeta potential value becomes -21.96 We can confirm that it is improving.
In order to make the surface potential of the carbon nanotube sufficiently close to zero so that the carbon nanotube is adsorbed on the surface of the cellulose fiber, the volume of the aqueous solution of polyethylene oxide (PEO) is 7 times the volume of the aqueous solution of polyacrylamide (PAM) It can be predicted that the zeta potential is -0.14 when the charge is applied and the surface charge value near to neutrality is shown.
If only a sufficient amount (80 ml) of polyethylene oxide (PEO) is added without adding an aqueous solution of polyacrylamide (PAM), the zeta potential may become closer to 0 or possibly have a positive value do.
<Results of sheet resistance measurement>
Experiments were carried out under the same conditions as in the above Experimental Example except that the volume of aqueous solution of polyacrylamide (PAM) and polyethylenoxide (PEO) was adjusted as shown in Table 2 below.
(Total average of 5 measurements)
As the sheet resistance value is low, it is expected that the electric current will flow well and the electromagnetic wave shielding effect will be also great. Therefore, in the nanocomposite having the single wall carbon nanotube and the cellulose fiber according to the embodiment of the present invention, As a result of measuring the total sheet resistance value while controlling the volume and the volume of the aqueous solution of polyethylene oxide (PEO), it was confirmed that as the volume specific gravity of the polyethylene oxide (PEO) solution becomes larger, the total sheet resistance value decreases have.
≪ Measurement results of electromagnetic wave shielding effect >
1 is a graph showing a result of electromagnetic wave shielding of a nanocomposite according to an embodiment of the present invention.
As shown in FIG. 1, the degree of total electromagnetic wave shielding was expressed by SE [dB] while controlling the volume of the polyacrylamide (PAM) aqueous solution and the volume of the aqueous solution of polyethylene oxide (PEO) Volume: the volume ratio of polyethylene oxide (PEO) aqueous solution was 1: 7.
As a result, the nanocomposite containing only polyethylene oxide (PEO) aqueous solution hardly causes the dispersion of the actual cellulose. Therefore, the polyethylene nano-particles (PEO) The adsorption of the tubes can be done well, but the dispersion does not occur and the carbon nanotubes are not evenly distributed on the whole surface.
However, when polyethylene oxide (PEO) is used, the amount of carbon nanotubes to be bonded to the cellulose surface can be increased, thereby making a material having high electrical conductivity.
The nanocomposite comprising the single-walled carbon nanotube and the cellulose fiber according to an embodiment of the present invention has been described above. Hereinafter, a method for producing a nanocomposite in which a single-walled carbon nanotube and a cellulose fiber are combined is described as another embodiment of the present invention.
2 is a flow chart of a method of manufacturing a nanocomposite according to an embodiment of the present invention.
2, a method of fabricating a nanocomposite according to an embodiment of the present invention includes the steps of immersing cellulose fibers in distilled water (S100), adding an aqueous solution of polyacrylamide (PAM) and polyethylene oxide (PEO) to distilled water containing cellulosic fibers (S200), and mixing the single walled carbon nanotube dispersion (S300).
The step of immersing the cellulose fibers in the distilled water (S100) is a step of loosening the bonding relationship between the fibers by dissolving the cellulose fibers in the distilled water.
The step (S200) of mixing an aqueous solution of polyacrylamide (PAM) and an aqueous solution of polyethylene oxide (PEO) in distilled water containing cellulose fibers (S200) is a step of mixing polyacrylamide (PAM), a dispersing agent for dispersing cellulose fibers, (PEO) which is converted into a positive charge close to the positive charge.
In this case, the volume ratio of the polyacrylamide (PAM) aqueous solution and the polyethylene oxide (PEO) aqueous solution may be 1:10 to 1: 3, and preferably 1: 7.
Single-walled carbon nanotubes injected through the step of mixing the single-walled carbon nanotube dispersion (S300) can be easily adsorbed onto the surface of the cellulose by the single-walled carbon nanotubes having a negative charge on the surface thereof by polyethylene oxide (PEO) do.
And then drying the liquid component such as distilled water, which has been introduced, to produce the nanocomposite.
The thus produced single-walled carbon nanotube-cellulose composite nanocomposite is flexible and can be used as a shielding material having a relatively high rupture strength.
Claims (8)
A sample made of an aqueous solution of polyacryl amide (PAM) and a solution of polyethylene oxide (PEO); And
A nanocomposite comprising a cellulose fiber,
Wherein the volume ratio of the aqueous solution of polyacrylamide (PAM) to the aqueous solution of polyethylene oxide (PEO) is 1: 7 for improving the electromagnetic wave shielding effect of the nanocomposite. Bonded nanocomposite.
Wherein the polyacrylamide in the polyacrylamide (PAM) aqueous solution is 0.2 wt%, and the polyethylene oxide in the polyethylene oxide (PEO) aqueous solution is 0.2 wt%. The single-walled carbon nanotube and the cellulose fiber are combined Nanocomposites.
Wherein the cellulose fibers are cellulose fibers having a fiber length of 7.4 to 23.8 mm and a fiber width of 10 to 20 占 퐉, wherein the single-walled carbon nanotube and the cellulose fiber are combined.
(a) dipping cellulosic fibers in distilled water;
(b) mixing an aqueous solution of polyacrylamide (PAM) and an aqueous solution of polyethylene oxide (PEO) in distilled water containing cellulosic fibers; And
(c) mixing the single-walled carbon nanotube dispersion,
The step (b) comprises mixing the aqueous solution of polyacrylamide (PAM) and the aqueous solution of polyethylene oxide (PEO) in a volume ratio of 1: 7 to improve the electromagnetic wave shielding effect of the nanocomposite. A method for producing a nanocomposite in which cellulose fibers are bonded.
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