WO2012115344A1 - Composite polymère/charge, électriquement conducteur, et son procédé de préparation - Google Patents

Composite polymère/charge, électriquement conducteur, et son procédé de préparation Download PDF

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Publication number
WO2012115344A1
WO2012115344A1 PCT/KR2011/010189 KR2011010189W WO2012115344A1 WO 2012115344 A1 WO2012115344 A1 WO 2012115344A1 KR 2011010189 W KR2011010189 W KR 2011010189W WO 2012115344 A1 WO2012115344 A1 WO 2012115344A1
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polymer
styrene
acrylonitrile
copolymer
composite
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PCT/KR2011/010189
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English (en)
Korean (ko)
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김우년
이윤균
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고려대학교 산학협력단
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Publication of WO2012115344A1 publication Critical patent/WO2012115344A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/005—Reinforced macromolecular compounds with nanosized materials, e.g. nanoparticles, nanofibres, nanotubes, nanowires, nanorods or nanolayered materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C08K3/041—Carbon nanotubes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/08—Copolymers of styrene
    • C08L25/12—Copolymers of styrene with unsaturated nitriles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
    • C08L55/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds

Definitions

  • the present invention relates to a polymer / carbon nanotube composite having excellent electrical properties through a physical method using the structural properties of the polymer blend and the selective dispersing property of the conductive filler and a method of manufacturing the same.
  • the present invention relates to a polymer composite having excellent electrical properties by adding carbon nanotubes as a conductive filler to a polycarbonate and poly (acrylonitrile-butadiene-styrene) copolymer blend, and a method of manufacturing the same using a twin screw extruder. will be.
  • carbon nanotubes Compared to most conductive fillers including metals, carbon nanotubes have a low density, high tensile strength and tensile elasticity, excellent abrasion resistance, and excellent electrical properties, which are very effective materials for electrostatic dispersion and electromagnetic shielding. In addition, carbon nanotubes can obtain high electrical properties with a small content based on a high aspect ratio. Therefore, if carbon nanotubes are used as the conductive fillers in polymers, the composites can be developed with excellent electrical properties at low contents.
  • carbon nanotubes having such excellent properties are used as a conductive filler. If the conductive filler added during the preparation of the polymer composite including the conductive filler is not evenly dispersed in the polymer matrix, it is difficult to expect excellent electrical properties. Carbon nanotubes also have low dispersion in polymer materials due to their long length and strong attraction between carbon nanotubes, and thus have limitations in their applicability and productivity.
  • Polycarbonate / Acrylonitrile-Butadiene-Styrene copolymer blend belongs to the general engineering plastics category, and various grades such as flame retardant, plating, foaming, reinforcement, and antistatic are developed as well as property / price design by prescription control.
  • carbon nanotubes which are conductive fillers, are added to a blend of polycarbonate and acrylonitrile-butadiene-styrene copolymer to prepare a composite having excellent electrical properties.
  • the first object of the present invention is electrostatic dispersion in polycarbonate / acrylonitrile-butadiene-styrene copolymer blends used in automobiles and various electrical and electronic components to prevent damage caused by static electricity and furthermore, damage caused by electromagnetic shielding.
  • the second problem of the present invention It is to provide a method for producing a polymer / conductive filler composite having an electrostatic dispersion characteristic as described above.
  • the (c) maleic anhydride graft styrene acrylonitrile copolymer is 1-10 parts by weight
  • (d) carbon nanotubes The polymer / carbon nanotube composite is characterized in that it comprises 0.1-15 parts by weight.
  • the polymer / carbon nanotube composite is characterized in that the conductive filler is a multi-walled carbon nanotubes or single-walled carbon nanotubes of the carbon nanotubes.
  • a mixture of polycarbonate and poly (acrylonitrile-butadiene-styrene) in a weight ratio of 4: 6 to 6: 4, based on 100 parts by weight of the mixture, maleic anhydride graft styrene 1-10 parts by weight of acrylonitrile copolymer and carbon nanotubes are fed to a 0.1-15 parts by weight biaxial extruder, (B) the biaxial extruder is divided into six sections equally in length from the hopper to the nozzle direction Maintaining a temperature of 220-240 ° C., 250-270 ° C., 270-290 ° C., 270-290 ° C., 270-290 ° C., 270-290 ° C., 270-290 ° C., and melt extruding the supplied mixture.
  • a method of preparing a polymer / carbon nanotube composite Disclosed is a method of preparing a polymer / carbon nanotube composite.
  • a method for preparing a polymer / carbon nanotube composite wherein the six sections are maintained at 230 ° C., 260 ° C., 280 ° C., 280 ° C., 280 ° C. and 280 ° C., respectively. .
  • the twin-screw extruder is a method for producing a polymer / carbon nanotube composite, characterized in that the coaxial twin-screw extruder.
  • the twin-screw extruder has an inner diameter of 11 mm, a screw length / screw diameter of 40, it is disclosed that the method for producing a polymer / carbon nanotube composite, characterized in that operated at 50 pm.
  • the polymer / carbon nanotube composite according to the present invention is made of sea-island or co-continuous structure by varying the content ratio of the polymer blend, and the electrical properties are improved by using the selective dispersion of the conductive filler.
  • the island-in-the-sea structure uses a compatibilizer, and in the case of the mutually continuous structure, if a double percolation structure is made, the electrical connection between the carbon nanotubes is made by the structural characteristics without chemical treatment of the carbon nanotubes. Excellent electrical characteristics
  • FIG. 4 is a transmission electron micrograph when SAN-g-MAH is added as a compatibilizer for a content ratio of 8: 2 of a polycarbonate: poly (acrylonitrile-butadiene-styrene) blend corresponding to Comparative Example 1.
  • FIG. 4 is a transmission electron micrograph when SAN-g-MAH is added as a compatibilizer for a content ratio of 8: 2 of a polycarbonate: poly (acrylonitrile-butadiene-styrene) blend corresponding to Comparative Example 1.
  • FIG. 8 is a transmission electron micrograph of polycarbonate / poly (acrylonitrile-butadiene-styrene) / carbon nanotube corresponding to Example 2.
  • FIG. 8 is a transmission electron micrograph of polycarbonate / poly (acrylonitrile-butadiene-styrene) / carbon nanotube corresponding to Example 2.
  • FIG. 10 shows a graph of electrical conductivity of carbon nanotube composites according to the addition of SAN-g-MAH in relation to the content ratio of polycarbonate: poly (acrylonitrile-butadiene-styrene) 8: 2.
  • the present invention provides a polymer / conductive filler composite comprising a polycarbonate, poly (acrylonitrile-butadiene-styrene) copolymer, maleic anhydride graft styrene acrylonitrile copolymer, and carbon nanotubes. to provide.
  • the weight ratio of the polycarbonate and the poly (acrylonitrile-butadiene-styrene) copolymer is characterized in that 8: 2, 5: 5, 2: 8.
  • the polymer / carbon nanotube composite of the present invention may include carbon nanotubes in an amount of 0.1 to 5.0 parts by weight relative to the total composite.
  • the polymer / carbon nanotube composite of the present invention has a weight ratio of polycarbonate and poly (acrylonitrile-butadiene-styrene) copolymer of maleic anhydride graft styrene acrylonitrile relative to 8: 2.
  • the copolymer may include 5 parts by weight relative to the total composite.
  • the polymer / carbon nanotube composite of the present invention may have a copolymerization ratio of 50:20:30 of poly (acrylonitrile-butadiene-styrene) copolymer.
  • the filler used in the present invention may be a filler having conductivity including multi-walled carbon nanotubes or single-walled carbon nanotubes.
  • the present invention provides a polymer comprising a polycarbonate, poly (acrylonitrile-butadiene-styrene) copolymer and carbon nanotubes supplied to a twin screw extruder, and melt extrusion into a twin screw extruder. It provides a method for producing a carbon nanotube composite.
  • the twin-screw extruder is characterized in that the distance from the hopper to the nozzle is classified into a predetermined section and the temperature of each section is set to 230-280 °C.
  • the present invention is composed of six sections from the hopper to the nozzle, the temperature of each section 230 °C, 260 °C, 280 °C, 280 °C, It can be set to 280 °C and 280 °C.
  • the present invention may be a twin screw extruder in the same direction.
  • the present invention is an inner diameter of the twin screw extruder is 11 mm, the length of the screw / screw diameter is 40, can be operated at 50 pm.
  • the present invention provides a polymer / carbon nanotube composite including a polycarbonate, poly (acrylonitrile-butadiene-styrene) copolymer, maleic anhydride graft styrene acrylonitrile copolymer, and carbon nanotubes.
  • the poly (acrylonitrile-butadiene-styrene) copolymer serves to impart poor chemical resistance and fairness to polycarbonate.
  • carbon nanotubes are conductive particles, so that the entire composite has conductivity, and serves to improve mechanical strength.
  • PC / ABS blend is an excellent engineering plastic alloy resin that complements the ideal properties of other engineering plastics with the advantages of ABS such as plating, impact resistance and processability.
  • polycarbonate and poly (acrylonitrile-butadiene) were used to confirm the electrical properties of the composites by the intercontinental or island-in-the-sea structure formed according to the content ratio of PC and ABS when blending using PC / ABS blend as a basic metric.
  • -Styrene) copolymer is preferably 8: 2, 5: 5-2: 8.
  • the island-in-the-sea yarn structure is represented as shown in FIG. 11, and the intercontinental structure is shown as shown in FIG. 12.
  • the island-in-the-sea yarn structure refers to a structure in which a continuous phase and a dispersed phase coexist when a small amount of one type of polymer is added when two kinds of polymers are blended.
  • Intercontinuous phase structure refers to a structure in which two polymers each form a continuous phase when two kinds of polymers are blended in a similar amount.
  • the double percolation structure that can be made in such a continuous phase structure is realized when the two types of polymers are blended and the conductive filler added therein exhibits the property of selectively dispersing in one of the two polymers. do.
  • the conductive filler when a conductive filler is added to one polymer, the conductive filler exhibits a percolation structure at a specific content in the polymer.
  • the polymer is blended with another polymer and the conductive filler is mainly dispersed in only one polymer, if the polymer blend structure forms a mutually continuous structure, another percolation structure is formed in the percolation structure, resulting in a lower content of the conductive filler.
  • This has the advantage of forming an electrical pass way in. Therefore, if the double percolation structure can be implemented in the composite including the conductive filler, even a small amount of filler can induce excellent electrical properties.
  • poly (acrylonitrile-butadiene-styrene) copolymers and polycarbonates are known to be incompatible with each other.
  • the conductive filler When such a poor compatibility of the polymer is blended to form an island-in-the-sea yarn or intercontinuous structure according to the content ratio of each polymer.
  • a conductive filler such as carbon nanotubes is added to the polymer blend, the conductive filler has a property of being dispersed in a specific polymer. If the polymer blend forms a dispersed phase, that is, an island-in-the-sea structure and is incompatible with each other, and if the conductive filler is added, the conductive filler may not be evenly dispersed in the polymer matrix and the electrical pass between the conductive fillers It's very hard to form a way. In other words, the electrical properties are degraded because it prevents the connection between the conductive fillers.
  • the conductive filler is added to the polymer blend having such a structure, and when the added conductive filler has dispersion selectivity, the conductive filler is dispersed in any polymer, but the polymer itself forms a continuous phase and makes a pass way. Conductive filler can make an electrical connection. As a result, the electrical properties of the composite will be improved.
  • Carbon nanotubes impart conductivity to the composite as conductive particles.
  • Composites given conductivity have electrostatic dispersion characteristics and electromagnetic shielding properties and are easy to process, and thus can be applied to various fields such as mobile phone cases.
  • the composite containing carbon nanotubes also improves mechanical strength.
  • the polymer / carbon nanotube composite of the present invention preferably includes 0.1-5 parts by weight of carbon nanotubes relative to the total composite.
  • both multi-walled carbon nanotubes and single-walled carbon nanotubes may be used, and in terms of economics, multi-walled carbon nanotubes are more preferably used.
  • the copolymerization ratio of the poly (acrylonitrile-butadiene-styrene) copolymer included in the polymer / carbon nanotube composite of the present invention is preferably 50:20:30. This copolymerization ratio is excellent in chemical resistance and processability of the poly (acrylonitrile-butadiene-styrene) copolymer, and also has high compatibility with polycarbonate.
  • the polymer / carbon nanotube composite of the present invention comprises the steps of supplying polycarbonate, poly (acrylonitrile-butadiene-styrene) copolymer, maleic anhydride graft styrene acrylonitrile copolymer and carbon nanotubes to a twin screw extruder, Melt-extruding with an extruder.
  • Surface treatment methods including acid treatment, which are generally performed to improve the dispersibility of carbon nanotubes, damage the surface of the carbon nanotubes or wrap the surface of the tube to reduce physical properties.
  • the carbon nanotubes are dispersed in the polymer using a twin screw extruder without acid treatment of the carbon nanotubes.
  • the extruder consists of a hopper to which the raw material is supplied, a screw for melt mixing and moving the supplied raw material, and a nozzle for discharging the melt mixed raw material in a predetermined shape.
  • a twin screw extruder is used as the extruder, the distance from the hopper to the nozzle is classified into predetermined sections, and the temperature of each section is preferably set to 230-280 ° C. The temperature range is set in consideration of the melting temperature of the polymer to be blended.
  • the twin screw extruder of the present invention should be operated under conditions in which the acid-treated carbon nanotubes can be uniformly dispersed in the polymer.
  • the twin screw extruder of the present invention has a distance from the hopper to the nozzle in six sections, and the temperature in each section is 230 ° C., 260 ° C., 280 ° C., 280 ° C., 280 ° C. and 280 ° C. in the direction of the nozzle from the hopper, respectively. Is preferably set to. In the initial section where carbon nanotube-containing polymer material is supplied, the temperature is gradually increased, and four sections close to the nozzle side are kept at 280 ° C. at which all polymers melt and have a constant viscosity, thereby dispersing carbon nanotubes in the melt. It is important to give them enough time to do so.
  • the twin screw extruder of the present invention may be a coaxial twin screw extruder, in which case effective mixing and dispersion of carbon nanotubes can be achieved.
  • the geometric design of the twin screw extruder is important for uniform dispersion of carbon nanotubes.
  • the inner diameter of the twin screw extruder is 11 mm
  • the screw length / screw diameter is 40
  • the screw is operated at 50 pm. .
  • the polymer / carbon nanotube composite prepared through the melt blend as described above has excellent mechanical strength, chemical resistance and processability, and has all the advantages of polycarbonate and poly (acrylonitrile-butadiene-styrene) copolymer, and maleic acid. Increasing compatibility by the anhydride graft styrene acrylonitrile copolymer can maximize the effect of improving the electrical properties by the carbon nanotubes.
  • Polycarbonate (grade: PC 300 10, number average molecular weight 11,000, weight average molecular weight 30,000, glass transition temperature 156.6 ° C., LG Chem. LTD., Hereinafter referred to as 'PC') in a vacuum oven at 80 ° C.
  • poly (acrylo Nitrile-butadiene-styrene) (grade: XR 401, weight average molecular weight 50,000-250,000, glass transition temperature 105 °C, LG Chem.
  • 'ABS' multi-walled carbon nanotube (length 10-15nm , 10-20 nm in diameter, 97% by weight or more, JEIO Co., hereinafter referred to as 'MWCNT' and maleic anhydride graft styrene acrylonitrile (hereinafter referred to as 'SAN-g-MAH'), respectively. Dry for 24 hours.
  • the dried polymer was added 1 part by weight of MWCNT and 5 parts by weight of SAN-g-MAH based on 100 parts by weight of the mixture of PC and ABS in a weight ratio of 8: 2.
  • the resultant was injected into a co-rotating twin screw extruder, and melt-extruded at a speed of 50 rpm to prepare a polymer / carbon nanotube composite.
  • the coaxial twin screw extruder used an inner diameter of 11 mm, (screw length) / (screw diameter) of 40, 230 °C, 260 °C, 280 °C, 280 °C, 280 °C, 280 °C, 280 from the hopper to the nozzle direction
  • the temperature was set at ° C.
  • a polymer / carbon nanotube composite was prepared in the same manner as in Example 1, except that the content of MWCNT was 3 parts by weight.
  • a polymer / carbon nanotube composite was prepared in the same manner as in Example 1 except that the content ratio of PC and ABS was 8: 2 and the content of MWCNT was 5 parts by weight.
  • a polymer / carbon nanotube composite was prepared in the same manner as in Example 1 except that the mixing ratio of PC and ABS was 5: 5, and the content of MWCNT was 0.1 to 5 parts by weight and no SAN-g-MAH was added. It was.
  • a polymer composite was prepared in the same manner as in Example 1 except that the content ratio of PC and ABS was 8: 2 and MWCNT was not included.
  • a polymer composite was prepared in the same manner as in Example 4 except that the content ratio of PC and ABS was 5: 5 and MWCNT was not included.
  • a polymer / carbon nanotube composite was prepared in the same manner as in Example 1, except that SAN-g-MAH was not included.
  • a polymer / carbon nanotube composite was prepared in the same manner as in Example 2, except that SAN-g-MAH was not included.
  • a polymer / carbon nanotube composite was prepared in the same manner as in Example 3, except that SAN-g-MAH was not included.
  • a polymer / carbon nanotube composite was prepared in the same manner as in Example 4, except that the content ratio of PC and ABS was 8: 2.
  • a polymer / carbon nanotube composite was prepared in the same manner as in Example 4, except that the content ratio of PC and ABS was 2: 8.
  • a polymer composite was prepared in the same manner as in Comparative Example 1, except that SAN-g-MAH was not included.
  • a composite was prepared in the same manner as in Comparative Example 2, except that the content ratio of PC and ABS was 8: 2.
  • a composite was prepared in the same manner as in Comparative Example 2, except that the content ratio of PC and ABS was 2: 8.
  • a polymer / carbon nanotube composite was prepared in the same manner as in Comparative Example 6 except that a single polymer PC was used.
  • FIG. 1 and FIG. 2 correspond to Comparative Example 8 and Comparative Example 2
  • FIGS. 3 and 4 are transmission electron microscope (HR-TEM) photographs of PC / ABS blends corresponding to Comparative Example 10 and Comparative Example 1.
  • FIG. 5 and 6 correspond to Comparative Examples 4 and 4
  • FIGS. 7 and 8 are transmission electron micrographs of PC / ABS / MWCNTs corresponding to Comparative Examples 7 and 2.
  • FIG. 1 and FIG. 2 correspond to Comparative Example 8 and Comparative Example 2
  • FIGS. 3 and 4 are transmission electron microscope (HR-TEM) photographs of PC / ABS blends corresponding to Comparative Example 10 and Comparative Example 1.
  • FIG. 5 and 6 correspond to Comparative Examples 4 and 4
  • FIGS. 7 and 8 are transmission electron micrographs of PC / ABS / MWCNTs corresponding to Comparative Examples 7 and 2.
  • FIG. 1 shows that ABS is present in the form of droplets in a blend in which PC is a continuous phase and ABS is a dispersed phase.
  • FIG. 2 it can be seen that both phases form an intercontinuous phase structure in which a continuous phase is formed.
  • Figure 3 it can be seen that the PC appears in the form of droplets in the ABS continuous phase as a dispersed phase.
  • FIGS. 5 and 6, 7 and 8 show transmission electron micrographs of the PC / ABS / MWCNT composite. All of the photos showed that MWCNTs were predominantly dispersed on the ABS in the PC / ABS blend. Comparing FIG. 5 to FIG. 7, the photo is shown according to the content ratio of PC and ABS.
  • the electrical connection of the MWCNT is well established in the intercontinental structure when the content ratio of the two polymers is similar. Can be. In other words, the double percolation structure is implemented, and more excellent electrical properties can be expected.
  • the MWCNT is located in the dispersion phase in the polymer blend that is incompatible with each other, as shown in FIG. 5, since the droplet size of the dispersion phase and the spacing between the droplets are wide, it is difficult to make a connection between the MWCNTs and the dispersion is not good. Physical properties will be lowered. Therefore, to solve the problem in this case, SAN-g-MAH was added as a compatibilizer, and as shown in FIG.
  • Each polymer / carbon nanotube composite was dried at 80 ° C. for 12 hours, hot pressed at 260 ° C. to produce a film, and then 1.5 cm long and 1 cm long specimens were prepared.
  • Four thin gold wires (99% purity and 0.05 mm thickness) were attached to the surface of the specimen with conductive graphite paint, and electrical conductivity was measured by a 4-probe method. The results are shown in FIGS. 9 and 10 below.
  • Figure 9 shows the electrical conductivity according to the content of MWCNT for the content ratio of 8: 2 PC and ABS.
  • the change in the electrical conductivity according to the addition of the compatibilizer can be seen by comparing the composite without the addition of SAN-g-MAH as a compatibilizer. It can be seen that the electrical conductivity is improved by adding SAN-g-MAH as a result of electrical conductivity corresponding to 3 in Example 1 and 5 in Comparative Example 3. This is because the ABS phase in which MWCNTs are dispersed is increased in distribution due to the addition of a compatibilizer, and as a result, the dispersibility of MWCNTs is increased as shown in the transmission electron microscope results.
  • Figure 10 shows the difference between the electrical conductivity according to the PC and ABS content ratio change in the PC / ABS / MWCNT composite and the electrical conductivity of the composite prepared using a single polymer.
  • the blend may have island-in-the-sea yarns or intercontinuous structure. It can be seen that the electrical conductivity change of the composite due to the structural change and the dispersion characteristics of the added conductive filler. This is the result of electrical conductivity corresponding to Example 4, Comparative Examples 6 and 7, and Comparative Example 11.
  • the composite having the double percolation structure that is, the ratio of PC to ABS content of 5: 5 has the best electrical conductivity.
  • 2: 8 which has the same double percolation structure, MWCNTs tend to agglomerate themselves in ABS continuous phase and have lower electrical conductivity than 5: 5.
  • the conductive filler such as MWCNT
  • a polymer composite having improved electrical properties is prepared by using a selective dispersion property in which the conductive filler is selectively dispersed in any one polymer. It was found that the conductive filler MWCNT was dispersed on the ABS when the matrix of PC and ABS was used as a matrix. When ABS forms a dispersed phase, both PC and ABS form a continuous phase and ABS forms a continuous phase. Electrical properties were measured for the case.

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Abstract

La présente invention concerne un composite polymère/charge, électriquement conducteur, et son procédé de fabrication, à l'aide de fibres île et mer formées pendant le mélange de deux types de polymères, des caractéristiques structurales telles qu'une structure de phases co-continues, et des caractéristiques de dispersion sélective de charges conductrices. Le composite polymère/charge conductrice selon la présente invention comprend du polycarbonate, un copolymère poly(acrylonitrile-butadiène-styrène), un copolymère styrène acrylonitrile greffé par anhydride maléique et des nanotubes de carbone. Ici, la structure du mélange de polymères est contrôlée par ajustement du rapport du polycarbonate et du copolymère poly(acrylonitrile-butadiène-styrène), et les propriétés physiques du composite peuvent être améliorées par la dispersion sélective des charges conductrices. Selon la présente invention, le procédé de préparation d'un composite polymère/charge conductrice est effectué par moulage de la composition à l'aide d'une extrudeuse à double vis, et de cette façon le composite polymère/charge conductrice a une conductivité électrique davantage accrue à l'aide des caractéristiques de dispersion sélective des charges conductrices.
PCT/KR2011/010189 2011-02-21 2011-12-28 Composite polymère/charge, électriquement conducteur, et son procédé de préparation WO2012115344A1 (fr)

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