KR20140017335A - Stretchable and conductive composite fiber yarn, manufacturing method thereof, and stretchable and conductive composite spun yarn including the same - Google Patents

Abstract

The present invention provides a stretchable and conductive composite fiber yarn which includes: a stretchable filament yarn; and a stretchable and conductive nanofiber containing a conductive nanoparticle fixed on at least one selected from a conductive polymer and a stretchable polymer. The stretchable filament yarn is covered by the stretchable and conductive nanofiber.

Description

Stretchable conductive composite yarn, a method of manufacturing the same, and a stretched conductive composite yarn comprising the same

The present invention relates to a stretchable conductive composite yarn, a method of manufacturing the same, and a stretchable conductive composite yarn including the same, in detail, a stretchable conductive composite yarn usable for an electronic device due to its excellent durability and excellent surface insulation effect, and a stretchable conductive composite including the same It is about the yarn.

The present invention is derived from the results of Samsung Electronics' 'Nano-based Soft Electronics Research' of the 'Global Frontier R & D Project', a national R & D project of the Ministry of Education, Science and Technology:

Assignment number: 2011-0031659

Department name: Ministry of Education, Science and Technology

Research Project Name: Global Frontier R & D Project

Research title: Nano-based soft electronics research

Organizer: Samsung Electronics

Period of study: August 1, 2011 ~ July 31, 2012.

Contribution rate: 100%

Specialized research management organization: Samsung Electronics

Fiber-based electronic devices are still in the conceptual stage, but they can replace many electronic device markets due to various advantages such as the possibility of stretching and weaving fibers, large surface area, variety of surface treatments, and ease of composite construction. Most likely.

The polymer materials that make up most of the fibers are usually materials with low electrical conductivity, so that the fibers are usually used as electrical insulators and are inadequate for use as conductive materials. The method of manufacturing an electrically conductive fiber by the addition of such a method is widely used.

However, the conductive fibers or fabrics thus prepared, despite their excellent conductivity, are very inflexible and still inconvenient for use directly in electronic devices or for interconnecting electronic devices.

It is intended to provide a composite yarn that can be used for electronic devices due to its flexibility and excellent electrical properties.

The present invention provides a method of manufacturing a stretchable conductive composite yarn using stretchable filament yarn and stretchable conductive nanofibers.

It is intended to provide a stretchable conductive composite yarn that can be used in electronic devices due to its excellent durability and excellent surface insulation effect.

According to one aspect, stretch filament yarn; And a stretchable conductive nanofiber comprising conductive nanoparticles immobilized on at least one of the conductive polymer and the stretchable polymer.

The stretchable filament yarn may be covered by the stretchable conductive nanofibers.

The conductive polymer may include at least one of polyacetylene, polypyrrole, polythiophene, polyethylenedioxythiophene, polyphenylenevinylene, polyphenylene, polysilane, polyfluorene, polyaniline and poly sulfonide. .

The stretchable polymer may be polybutadiene, poly (styrene-butadiene, poly (styrene-butadiene-styrene), poly (styrene-ethylene-butylene-styrene), ethylene propylene diene rubber (EPDM), acrylic rubber, polychloroprene rubber (CR ), Polyurethane (PU), fluorine rubber, butyl rubber and polyisoprene.

The conductive nanoparticles may include at least one of carbon nanotubes, graphene, and metal wires.

The carbon nanotubes are carbon nanotubes surface-modified with 3,4-dihydroxy-L-phenylalanine (CNT-DOPA), carbon nanotubes surface-modified with acryl (CNT-Acryl) and carbon nanotubes modified with epoxy It may include at least one of the tube (CNT-Epoxy).

The conductive polymer and the stretchable polymer may form a sheath and the conductive nanoparticles may form a core.

The conductive polymer and the stretchable polymer may form a sea part, and the conductive nanoparticles may form an island part.

The weight ratio of the conductive polymer and the stretchable polymer may be 1 to 50:10 to 50.

The content of the conductive nanoparticles may be 0.2 to 20% by weight relative to the total weight of the stretchable conductive nanofibers.

The stretchable conductive nanofibers may further include metal nanoparticles.

According to another aspect, the step of drafting the stretchable filament yarn in one direction to guide the vortex tube region; Forming a stretchable conductive nanofiber including conductive nanoparticles immobilized on at least one of the conductive polymer and the stretchable polymer and supplying the stretched conductive nanofiber to the vortex tube region; And covering the stretchable filament yarn with the stretchable conductive nanofibers in the swirl tube region.

The stretchable conductive nanofibers may be formed by electrospinning a composition including the conductive polymer, the stretchable polymer, and the conductive nanoparticles.

The stretchable conductive nanofibers may be supplied to meet acutely with the stretchable filaments within the swirl tube region.

The covering may be to give a twist using a vortex of air.

The stretchable conductive yarn; And it is provided with a stretch conductive composite spun yarn comprising a staple fiber.

The staple fiber may comprise at least one of cotton, wool, hemp, silk, polyester, nylon and rayon.

The stretchable conductive yarn may form a core and the staple fibers may form a sheath.

As a fabric comprising the stretch conductive composite spun yarn, a fabric for generating or transmitting electrical signals is provided.

The stretchable conductive composite according to one aspect may be usefully applied to the field of electronic devices having excellent flexibility and conductivity and requiring electrical properties.

The stretchable conductive composite yarn may maintain a strong adhesive force by forming a stable interface between the stretchable filament yarn and the stretchable conductive nanofibers constituting the composite yarn.

The stretchable conductive yarn may be effectively manufactured by covering the stretchable filament yarn with stretchable conductive nanofibers.

According to another aspect, a stretchable conductive composite yarn has excellent durability and surface insulation and can be stably applied to an electronic device field requiring electrical characteristics.

1 is a cross-sectional view of a stretchable conductive yarn according to one embodiment.
2 is a side view of the sheath-core type stretchable conductive nanofibers constituting the stretchable conductive composite yarn according to one embodiment.
3 is a cross-sectional view of an island-in-the-sea stretchable conductive nanofiber constituting the stretchable conductive composite yarn according to one embodiment.
FIG. 4 is a schematic diagram illustrating the hydrogen hydrogen bonding of carbon nanotubes and metal nanoparticles surface-modified with DOPA to the stretchable conductive nanofibers constituting the stretchable conductive composite yarn according to one embodiment.
FIG. 5 is a schematic view schematically showing an electrospinning apparatus used to manufacture a stretchable conductive nanofiber constituting the stretchable conductive composite yarn according to one embodiment.
6 is a photograph taken with an electron microscope of the stretchable conductive nanofibers constituting the stretchable conductive composite yarn according to one embodiment.
7 is a schematic view showing a method of manufacturing a stretchable conductive composite yarn according to one embodiment.
8 is a cross-sectional view of a stretchable conductive spun yarn according to another embodiment.
9 is a photograph taken with an electron microscope of a cross section of the stretchable conductive spun yarn according to Example 2. FIG.
10 is a photograph taken with an electron microscope of the side of the stretchable conductive spun yarn according to Example 2.

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Parts irrelevant to the description for clearly describing the present invention have been omitted, and the size of each component shown in the drawings are arbitrarily shown for convenience of description, and the present invention is not necessarily limited to the illustrated. In addition, the present invention is not limited to the specific embodiments described herein and may be embodied in other forms. The embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art.

1 is a cross-sectional view of the stretchable conductive composite yarn 100 according to one embodiment.

Stretch conductive composite yarn 100 according to one embodiment is a stretchable filament yarn 110; And a stretchable conductive nanofiber 120 including the conductive nanoparticles immobilized on at least one of the conductive polymer and the stretchable polymer.

The elastic filament yarn 110 refers to a fiber having elasticity and exhibiting elasticity in tension and relaxation, and having a filament form.

The stretchable conductive nanofiber 120 is a nano-sized fiber including a conductive polymer, a stretchable polymer, and a conductive nanoparticle, and refers to a fiber having elasticity by these components, exhibiting flexibility in tension and relaxation, and having conductivity.

The conductive polymer refers to a molecule capable of forming a fibrous structure, among others, a conductive polymer capable of passing electricity. Conductive polymers are conductive, fibrous molecules that can be dissolved in a solvent, for example, after electrospinning, wet spinning, conjugate spinning, melt blown spinning. Or a molecule capable of producing fibers when spun by conventional spinning methods including flash spinning or the like. The conductive polymer may be a support capable of forming the structure of the fiber, and may have affinity for the stretchable polymer to form the structure of the fiber together.

A stretchable polymer is a polymer that has elasticity and exhibits elasticity in tension and relaxation, and among these, refers to a molecule capable of forming a fiber structure. Stretchable polymers are molecules capable of making fibers, which can be prepared when they are dissolved in a solvent and then spun by conventional spinning methods including electrospinning, wet spinning, composite spinning, melt blown spinning or flash spinning. It means a molecule that can. The stretchable polymer may be a support capable of forming the structure of the fiber, and may have affinity for the conductive polymer to form the structure of the fiber together.

Conductive nanoparticles are conductive nano-sized particles that refer to a substance in the form of particles that can be fixed to at least one of the conductive polymer and the stretchable polymer by non-covalent bonds or physical forces.

The stretchable conductive nanofibers 120 have a diameter of a nano size and the diameter may be about 1 nm to 500 nm. When the diameter of the stretchable conductive nanofibers 120 satisfies the above range, the stretchable conductive nanofibers 120 have excellent conductivity resulting from the nano size.

The stretchable conductive composite yarn 100 includes such stretchable filament yarns 110 and stretchable conductive nanofibers 120 and has excellent flexibility and conductivity, and may be particularly useful in the field of electronic devices requiring electrical properties.

The stretchable conductive composite yarn 100 may be formed by covering the stretchable filament yarn 110 with the stretchable conductive nanofibers 120. Specifically, the stretchable conductive composite yarn 100 may have a structure in which the stretchable filament yarn 110 is examined and the stretchable conductive nanofibers 120 are effect yarns.

Since the stretchable filament yarn 110 to be examined has elasticity, the stretchable conductive composite yarn 100 is stretched in the longitudinal direction of the composite yarn when tension is applied from the outside, and contraction occurs in the longitudinal direction of the composite yarn when the tension is relaxed. By rising, it can be actively stretched and contracted by an external force, and on the other hand, the stretchable conductive nanofiber 120 that is an effector can have electrical conductivity and transmit an electrical signal to the outside. In addition, an interface is created by the stretchable conductive nanofibers 120 covering the stretchable filament yarn 110, and the surfaces of the stretchable conductive nanofibers 120 and the stretchable filament yarn 110 are heterogeneous as materials having elasticity. Since it does not have a very stable interface can be formed as a result strong adhesion can be maintained.

Examples of the stretchable filament yarn 110 may include spandex filament yarn or stretch polyester filament yarn. The stretchable polyester filament yarn 110 may be a polyester-based filament yarn manufactured by copolymerizing or adding a component to impart elasticity to the polyester component, but is not limited thereto.

The conductive polymers constituting the stretchable conductive nanofibers 120 include polyacetylene, polypyrrole, polythiophene, polyethylenedioxythiophene, polyphenylenevinylene, polyphenylene, polysilane, polyfluorene, polyaniline, and poly sulfonide. At least one of them.

The stretchable polymer constituting the stretchable conductive nanofibers 120 may include natural rubber, synthetic rubber, or elastomer, and specifically, natural rubber, foam rubber, acrylonitrile butadiene rubber, fluorine rubber, silicone rubber, and ethylene. Propylene rubber, urethane rubber, chloroprene rubber, styrene butadiene rubber, chlorosulfonated polyethylene rubber, polysulfide rubber, acrylate rubber, epichlorohydrin rubber, acrylonitrile ethylene rubber, urethane rubber, polystyrene elastomer, polyolefin Elastomeric polymers, polyvinyl chloride elastomers, polyurethane elastomers, polyester elastomers, or polyamide elastomers. Stretchable polymers include, for example, polybutadiene, poly (styrene-butadiene, poly (styrene-butadiene-styrene), poly (styrene-ethylene-butylene-styrene), ethylene propylene diene rubber (EPDM), acrylic rubber, polychloroprene rubber (CR ), Polyurethane (PU), fluorine rubber, butyl rubber and polyisoprene.

The conductive nanoparticles constituting the stretchable conductive nanofibers 120 may be at least one of carbon nanotubes, graphene, metal wires, and liquid metals. Carbon nanotubes, graphene or metal wires are particles capable of forming a conductive electrode, and are immobilized on at least one of a conductive polymer and a stretchable polymer capable of forming a fiber to impart excellent conductivity to the fiber.

The carbon nanotubes may include single walled carbon nanotubes or multi walled carbon nanotubes. Carbon nanotubes may include surface modified carbon nanotubes, surface unmodified carbon nanotubes, or mixtures thereof. For example, the carbon nanotubes may be a mixture of surface modified carbon nanotubes and surface unmodified carbon nanotubes.

The surface-modified carbon nanotubes may include surface-modified carbon nanotubes with good compatibility materials. For example, the surface-modified carbon nanotubes include urea, melamine, phenol, unsaturated polyester, epoxy, resorcinol, vinyl acetate, polyvinyl alcohol, vinyl chloride, polyvinyl acetal, At least one of acrylic, saturated polyester, polyamide, polyethylene, butadiene rubber, nitrile rubber, butyl rubber, silicone rubber, chloroprene rubber, vinyl, phenol-chloroprene rubber, polyamide and nitrile rubber-epoxy watches It may include a carbon nanotube surface-modified with a miscible material comprising a.

Carbon nanotubes include, for example, carbon nanotubes surface-modified with 3,4-dihydroxy-L-phenylalanine (CNT-DOPA), carbon nanotubes surface-modified with acryl (CNT-Acryl) and carbon nanotubes modified with epoxy It may include at least one of the tube (CNT-Epoxy).

2 is a side view of the sheath-core type stretchable conductive nanofibers 220 constituting the stretchable conductive composite yarn according to one embodiment.

Referring to FIG. 2, the stretchable conductive nanofibers 220 may have a dual layer of a core and a sheath, the conductive polymer and the stretchable polymer 221 may form a sheath, and the conductive nanoparticles 223 may form a core. The sheath-core structure of the fiber can be obtained by spinning the composition for fiber production using the shape of the spinning nozzle as a double nozzle of the inner nozzle and the outer nozzle. The core composed of the conductive nanoparticles 223 provides conductivity to the stretchable conductive nanofibers 220, and the sheath composed of the conductive polymer and the stretchable polymer 221 provides flexibility with the stretchable conductive nanofibers 220 conductivity. .

3 is a side view of the island-in-the-sea stretch-conductive nanofiber 320 constituting the stretch-conductive composite yarn according to one embodiment.

Referring to FIG. 3, the stretchable conductive nanofiber 320 may have a sea island-like cross section as if an island is located in the sea, and the conductive polymer and the stretchable polymer 321 form a sea part and are conductive. Nanoparticles 323 may form island parts. The islands of the islands-in-sea structure can likewise be obtained by spinning the composition for fiber production using a spinning nozzle appropriately designed to have an island-in-sea cross-sectional shape. The figure portion composed of the conductive nanoparticles 323 imparts conductivity to the stretchable conductive nanofibers 320 and the solution portion composed of the conductive polymer and the stretchable polymer 321 provides flexibility with the stretchable conductive nanofibers 320 conductivity. Grant.

The weight ratio of the conductive polymer and the stretchable polymer constituting the stretchable conductive nanofibers may be 1 to 50:10 to 50. When the weight ratio of the conductive polymer and the stretchable polymer satisfies the above range, the cross-section of the stretchable conductive nanofiber may be formed in a satisfactory shape without distortion.

The content of the conductive nanoparticles may be 0.2 to 20% by weight relative to the total weight of the stretchable conductive nanofibers. When the content of the conductive nanoparticles satisfies the above range, a satisfactory level of conductivity may be imparted while appropriately spinning the stretchable conductive nanofibers.

The stretchable conductive nanofibers may further include metal nanoparticles.

The metal nanoparticles may be disposed on the surface of the stretchable conductive nanofibers or disposed within the fibers. For example, metal nanoparticles can be disposed in the fiber.

FIG. 4 is a schematic diagram showing the hydrogen hydrogen bonding of carbon nanotubes 425 and metal nanoparticles 427 surface-modified with DOPA to stretchable conductive nanofibers constituting the stretchable conductive composite yarn according to one embodiment.

Referring to FIG. 4, in the stretchable conductive nanofibers, the metal nanoparticles 427 may be connected to and disposed by surface hydrogen-modified carbon nanotubes or surface-modified carbon nanotubes.

The metal nanoparticles 427 include silver, copper, nickel, gold, tin, zinc, platinum, tungsten, molybdenum, magnesium oxide, beryllium oxide, chromium oxide, titanium oxide, zinc oxide, barium titanate, diamond, graphite, and carbon nanoparticles. And at least one of silicon nanoparticles, boron nitride, aluminum nitride, boron carbide, titanium carbide, silicon carbide, and tungsten carbide.

Metal nanoparticles 427 may, for example, have a diameter in the range of about 100-300 nm. When the diameter of the metal nanoparticles 427 satisfies the above range, the metal nanoparticles 427 may form a hydrogen hydrogen bond appropriately with the carbon nanotubes 425.

The metal nanowires may include at least one of silver, nickel, platinum, and gold nanowires.

In addition, the metal in liquid form may be disposed on the surface of the stretchable conductive nanofibers or disposed within the fibers. For example, metal nanoparticles can be disposed in the fiber.

FIG. 5 is a schematic view schematically showing an electrospinning apparatus used to manufacture a stretchable conductive nanofiber constituting the stretchable conductive composite yarn according to one embodiment.

The stretchable conductive nanofibers may be prepared by fabricating a spinning composition including a conductive polymer, a stretchable polymer, and a conductive nanoparticle by electrospinning, wet spinning, composite spinning, melt blown spinning, or flash spinning.

When the elastic conductive nanofibers are manufactured by electrospinning, the spinning composition is placed in the syringe 511 and pushed out of the nozzle 513 at a constant speed using the syringe pump 512. When droplets originating from the spinning composition are formed outside the nozzle 513, a high voltage of 10-20 Kv is applied to the nozzle with the power supply 515 to electrospin the spinning composition to the collector 517. The diameter of the stretchable conductive nanofibers is controlled by controlling the pump speed of the syringe 511, the diameter of the nozzle 513, the magnitude of the voltage applied to the nozzle 513, the spinning speed and the distance between the nozzle 513 and the collector 517. Physical properties such as can be easily changed.

Double nozzles may be used as the nozzles 513 of the electrospinning apparatus to produce stretch-conductive nanofibers having a sheath-core or island-in-sea structure. For example, the inner nozzle uses a composition containing conductive nanoparticles or conductive nanoparticles and metal nanoparticles, and the outer nozzle uses a composition containing a conductive polymer and a stretchable polymer, thereby stretching the cis-core or island-in-sea structure. Conductive nanofibers can be prepared.

Optionally, the spinning composition may be spun onto an electrode on which an electric field is applied to prepare stretchable conductive nanofibers arranged in a specific direction.

The method may further comprise curing the stretchable conductive nanofibers produced by spinning. Curing may include, for example, heat or UV treatment.

6 is a photograph taken with an electron microscope of the stretchable conductive nanofibers constituting the stretchable conductive composite yarn according to one embodiment. Referring to FIG. 6, the stretchable conductive nanofibers appear to have a uniform shape.

7 is a schematic diagram illustrating a method of manufacturing a stretchable conductive composite yarn 700 according to one embodiment.

According to another embodiment, a method of manufacturing a stretchable conductive composite yarn 700 may include: drawing a stretchable filament yarn 710 in one direction to guide the vortex tube region 719; Forming a stretchable conductive nanofiber 720 including conductive nanoparticles immobilized on at least one of the conductive polymer and the stretchable polymer and supplying the stretched conductive nanofiber 720 to the vortex tube region 719; And covering the stretchable filament yarn 710 with the stretchable conductive nanofibers 720 in the swirl tube region 719.

Since the stretchable conductive composite yarn 700 is manufactured using the filament yarn 710 as the screening and the stretchable conductive nanofiber 720 as the effect yarn, the stretchable composite yarn 700 exerts elasticity by the screening against external force applied to the composite yarn. The electrical signal is applied by the effector to deliver the electrical signal. In addition, since the filament yarn 710 and the conductive nanofiber 720 having similar properties are used, the interface between them is chemically stable, so that the screening and effector can be tightly focused.

First, to provide screening to the vortex tube region 729 where the covering takes place, the stretchable filament yarn 710 is drafted in one direction to guide the vortex tube region 719.

Likewise, in order to provide an effect yarn to the swirling tube region 729 where the covering takes place, the stretchable conductive nanofibers 720 including the conductive nanoparticles immobilized on at least one of the conductive polymer and the stretchable polymer are formed to form the swirl tube. Supply to area 719. The stretchable conductive nanofibers 720 may be formed by electrospinning the composition including the conductive polymer, the stretchable polymer, and the conductive nanoparticles to the collector 717 through the nozzle 713 as described above. Thus, this step may be to supply the vortex tube region 719 while simultaneously electrospinning the stretchable conductive nanofibers 720.

Finally, stretchable filament yarn 710 is covered with stretchable conductive nanofibers 720 in the vortex tube region 719.

The stretchable conductive nanofibers 720 may be supplied to acutely meet the stretchable filaments 710 within the swirl tube region 719. By meeting at such an acute angle, the covering by the vortex can be made more effectively.

Covering the stretchable filament yarn 710 with the stretchable conductive nanofibers 720 may be made by twisting using the vortex of air.

8 is a cross-sectional view of a stretchable conductive composite yarn 1000 according to another embodiment.

Stretch conductive composite yarn 1000 according to another embodiment is the stretchable conductive composite yarn 800 described above; And staple fibers 900.

Since the stretch conductive composite yarn 1000 is wrapped around the stretch conductive yarn 800 by the staple fiber 900, the stretch conductive yarn 800 may be protected, and thus the stretchability may last for a long time.

The stretchable conductive spun yarn may be formed by using a ring spinning machine that is commonly used to form the stretchable conductive composite yarn 800 as a core and the staple fiber 900 as a sheath.

The stretchable conductive composite yarn 1000 has excellent elasticity and electrical properties by the stretchable conductive yarn 800 as a core, and the surface of the stretchable conductive yarn 800 is made of a non-conductive material by the staple fiber 900 which becomes the sheath. Wrapped in, it has excellent insulation. Thus, the stretch conductive composite yarn 1000 has durability against repeated stretch and also has an insulating effect to protect the conductive surface.

In particular, the stretchable conductive spun yarn 1000 may have various characteristics by controlling the surface exposure ratio of the stretchable conductive composite yarn 800 serving as a core and the staple fiber 900 serving as a sheath.

As the staple fibers, natural fibers or synthetic fibers may be used, and for example, at least one of cotton, wool, hemp, silk, polyester, nylon, and rayon may be used.

Fabrics according to another embodiment include the stretchable conductive spun yarn described above to generate or transmit electrical signals.

The fabric including the stretchable conductive spun yarn can be used as an electrode of a biometric information acquisition sensor for obtaining biometric information, for example. In addition, fabrics containing stretchable conductive spun yarns are textile-based electronic devices for textile solar cells, stretchable transistors, stretchable displays, externally stimulating drug delivery, biosensors and gas sensors, photoregulated functional textiles, functional clothing, and defense industry. It can be used for functional products and the like.

Hereinafter, an organic light emitting display device according to an embodiment will be described in more detail. However, the present invention is not limited to the following examples.

Example  One

DOPA Fabrication of Surface Modified Carbon Nanotubes

0.03 g of carbon nanotubes (ILJIN CNT AP-Grade, Iljin Nanotech, Korea) was added to 20 ml of acetone and the particles were evenly dispersed by sonication for 1 hour. 10 ml of dopamine and 10 ml of EDC (1- (3-dimethylaminopropyl0-3-ethylcarbodiimide hydrochloride) were added to the resulting solution, followed by stirring for 4 hours to obtain a surface-modified carbon nanotube with DOPA.

Preparation of Stretch Conductive Nanofibers

The components were mixed according to the composition shown in Table 1 below, and uniformly mixed under sonication to prepare a composition for spinning. The composition was placed in a syringe and then pushed out of the nozzle at a constant rate (0.3 ml / h) using a syringe pump. When droplets of the spinning composition were formed out of the syringe nozzle, a fiber having a diameter of several tens to hundreds of nm was electrospun onto the collector by applying a voltage of 15 kv through a power supply to prepare a stretchable conductive nanofiber.

ingredient Example 1 Poly (3-hexylthiophene) (P3HT) (g) One SBS (g) One CNT (g) 0.2 CNT-DOPA (g) 0.1 1,3-dimethylimidazolysin tetrafluoroborate (g) 0.1 Gold nanoparticles (g) 0.1 DMF (g) 3

Preparation of Stretch Conductive Composite Yarn

Draft the spandex filament yarn in one direction to guide the stretched conductive nanofibers and feed the stretchable conductive nanofibers into the swirling tube region immediately upon electrospinning, while in the swirling tube region the elastic conductive nanofibers cover the spandex by vortexing with air. Thereby, the stretchable conductive composite yarn was manufactured.

Comparative Example  One

A composite yarn was manufactured in the same manner as in Example 1, except that CNT, CNT-DOPA, and gold nanoparticles were not included.

Evaluation example

(1) Measurement of conductivity of stretchable conductive yarn

The electrical conductivity of the composite yarn was measured at a relative humidity of 50% at room temperature by a conventional four line probe method. Carbon paste is used to prevent corrosion when contacting the gold wire electrode, and current (i), voltage (V), and two outsides of film type specimens (thickness t, width w) are generally 1-100㎛ thick. The conductivity for the distance l between the electrode and the two inner electrodes was measured using a Keithley conductivity measuring device.

The conductivity was calculated using the following formula, and the unit of conductivity was Siemens / cm or S / cm. In order to confirm the uniformity of the conductivity of the specimen, it was measured by a van der Pauw method, which is a standard four point probe.

Conductivity = (l.i) / (w.t.v)

(2) Internal stress measurement of stretch conductive composite yarn

Rotor type (Oscillating Disc Rheometer, ASTM D 2084-95) or Rotorless type (Curastometer ASTM D5289) can be used as a method to measure the internal stress (dynamic modulus) of the composite yarn. Internal stresses were measured as a ratio to the maximum length at which the fiber did not break with an elongated length when pulled with a force of / m 2.

Sample 1 (Example 1) The conductivity and the internal stretching stress measured in Sample 2 (Comparative Example 1) are shown in Table 2 below.

division Electrical Conductivity (S / cm) Internal stretching stress (%) Example 1 35 130 Comparative Example 1 One 20

As shown in Table 2, the stretchable conductive composite yarn according to Example 1 can be confirmed that the electrical conductivity and the internal stretch stress increased compared to the composite yarn of Comparative Example 1.

Example  2

Fabrication of Stretch Conductive Composite Spun Yarn

A stretch conductive composite spun yarn was prepared using the stretch conductive composite yarn as a core and a polyester fiber as a sheath using a ring spinning machine that is commonly used.

9 is a photograph taken with an electron microscope of a cross section of the stretchable conductive composite yarn thus obtained. It can be seen that the stretch conductive composite yarn is wrapped by staple fibers and can be well protected from the outside.

10 is a photograph taken with an electron microscope of the side of the stretchable conductive spun yarn. It can be seen that the stretchable conductive spun yarn has a uniform shape.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various modifications and equivalent arrangements may be made therein without departing from the scope of the present invention . Accordingly, the true scope of the present invention should be determined by the technical scope of the appended claims.

100, 700, 800: Stretch Conductive Composite Yarn
110, 710: stretch filament yarn
120, 220, 320, 720: stretchable conductive nanofibers
221, 321: conductive polymers and stretchable polymers
223, 323: conductive nanoparticles
425 carbon nanotube
427: metal nanoparticles
511: syringe
512: syringe pump
513, 713: nozzle
515: power supply
517, 717: collector
719: vortex tube region
900: staples
1000: stretch conductive composite yarn

Claims (20)

Stretch filament yarns; And
Stretchable conductive nanofibers including conductive nanoparticles immobilized on at least one of a conductive polymer and a stretchable polymer;
Stretch conductive composite yarn comprising a. The stretch conductive composite yarn of claim 1, wherein the stretch filament yarn is covered by the stretch conductive nanofibers. The stretch conductive composite yarn according to claim 1, wherein the stretch filament yarn is spandex filament yarn or stretch polyester filament yarn. The method of claim 1, wherein the conductive polymer is at least one of polyacetylene, polypyrrole, polythiophene, polyethylenedioxythiophene, polyphenylenevinylene, polyphenylene, polysilane, polyfluorene, polyaniline and poly sulfonide. Stretch conductive composite yarn comprising species. The method of claim 1, wherein the stretchable polymer is polybutadiene, poly (styrene-butadiene, poly (styrene-butadiene-styrene), poly (styrene-ethylene-butylene-styrene), ethylene propylene diene rubber (EPDM), acrylic rubber And at least one of polychloroprene rubber (CR), polyurethane (PU), fluorine rubber, butyl rubber and polyisoprene. The stretchable conductive composite yarn of claim 1, wherein the conductive nanoparticles include at least one of carbon nanotubes, graphene, metal wires, and liquid metals. According to claim 6, wherein the carbon nanotubes are carbon nanotubes (CNT-DOPA) surface-modified with 3,4-dihydroxy-L-phenylalanine, carbon nanotubes (CNT-Acryl) and epoxy surface-modified with acrylic Elastic conductive composite yarn comprising at least one of the surface-modified carbon nanotubes (CNT-Epoxy). The stretchable conductive yarn of claim 1, wherein the conductive polymer and the stretchable polymer form a sheath and the conductive nanoparticles form a core. The stretchable conductive composite yarn of claim 1, wherein the conductive polymer and the stretchable polymer form a sea part, and the conductive nanoparticles form an island part. The stretchable conductive composite yarn according to claim 1, wherein a weight ratio of the conductive polymer and the stretchable polymer is 1 to 50:10 to 50. The stretchable conductive composite yarn according to claim 1, wherein the content of the conductive nanoparticles is 0.2 to 20 wt% based on the total weight of the stretchable conductive nanofibers. The stretchable conductive composite yarn of claim 1, wherein the stretchable conductive nanofibers further include metal nanoparticles. Drafting the stretchable filament yarn in one direction to guide the vortex tube region;
Forming a stretchable conductive nanofiber including conductive nanoparticles immobilized on at least one of the conductive polymer and the stretchable polymer and supplying the stretched conductive nanofiber to the vortex tube region; And
Covering the stretchable filament yarn with the stretchable conductive nanofibers in the swirl tube region;
Method of manufacturing a stretchable conductive composite yarn comprising a. The method of claim 13, wherein the stretchable conductive nanofibers are formed by electrospinning a composition including the conductive polymer, the stretchable polymer, and the conductive nanoparticles. The method of claim 13, wherein the stretchable conductive nanofibers are supplied to meet the stretchable filaments at an acute angle within the vortex tube region. The method of claim 13, wherein the covering is twisted using vortex of air. The stretchable conductive composite yarn of any one of claims 1 to 12; And
Staple fibers;
Stretch conductive composite yarn comprising a. 18. The stretch conductive conjugated yarn of claim 17, wherein the staple fibers comprise at least one of cotton, wool, hemp, silk, polyester, nylon, and rayon. 18. The stretch conductive composite yarn of claim 17, wherein the stretch conductive yarns form a core and the staple fibers form a sheath. A fabric comprising the stretchable conductive spun yarn of claim 17, wherein the fabric generates or transmits electrical signals.

Images