• 제목/요약/키워드: 전도성 복합소재

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플라즈마 필러처리를 통한 탄화목분 복합소재 전도도 향상

  • Lee, Heon-Su;Kim, U-Yeong;Park, Hyeong-Cheol;Hwang, Jun-Yeon;Kim, Seong-Ryun
    • Proceedings of the Korean Vacuum Society Conference
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    • 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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    • pp.161.1-161.1
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    • 2015
  • 복합소재는 두가지 이상의 서로 다른 물질을 조합하여, 단일 물질이 가질 수 없는 뛰어난 특성을 가진 소재로 그 중 전기 전도성 복합소재는 일반적으로 폴리머와 전도성 필러의 혼합을 통해 만들어 전자파 차폐, 대전 방지 등의 목적으로 사용되고 있다. 종류에 따라 기존 금속 소재에 비해 가볍거나 탄성율이 높은 등의 장점이 있으나 필러나 레진에 따라 재활용에 어려움이 있으며 전도성 필러로 주로 쓰이는 카본블랙 등이 석유/천연가스 등의 한정적 자원으로부터 만들어짐에 따라 환경적인 이슈가 최근 부각되고 있다. 목재는 가장 널리 쓰이는 소재 중 하나로 재생 가능하며 친환경적인 특성으로 인해 더욱 다양한 분야로의 활용이 모색되고 있다. 본 연구에서는 목재 소재의 탄화를 통해 만들어진 탄화목분의 전도성 필러로의 적용가능성을 시험하고자 CBT 레진과 탄화목분 필러의 복합소재를 제작하였다. 탄화 목분 복합소재의 전도성은 20 wt% 필러 함량 기준 카본블랙 복합소재 전도도에 20%에 이르렀으며, 전도도의 향상을 위해 필러의 플라즈마 처리 시 복합소재의 전도도가 급격히 향상되어, 카본 블랙 복합소재 전도도의 3배에 이르렀다. 플라즈마 처리가 탄화목분 복합소재의 전도도향상에 미치는 영향을 분석하기 위해 micro-CT, TGA 분석을 수행하였으며, 플라즈마 처리 시 탄화 목분 필러가 일부 미분화 되어 복합소재의 전도도를 향상하는 것으로 나타났다. 이와 같이 탄화 목분의 전도성 복합소재 적용과, 탄화목분의 플라즈마 처리를 통해 친환경적일 뿐만아니라 전도도도 우수한 복합소재를 구현하였으며, 실험적으로 전도도 향상 메커니즘을 확인하였다.

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Hybrid Silver Nanowire를 이용한 복합 전극 전도성에 대한 연구

  • Lee, Su-Min;Lee, Jae-Hyeok;Lee, Cheol-Seung;Kim, Gwang-Beom;Kim, Seon-Min
    • Proceedings of the Korean Vacuum Society Conference
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    • 한국진공학회 2011년도 제41회 하계 정기 학술대회 초록집
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    • pp.275-275
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    • 2011
  • 전극에 응용할 수 있는 소재 중 탄소나노소재는 구리와 비슷한 전기 전도성을 가지며 박막 코팅 시 투명성이 보장되고 코팅력이 매우 우수하다. 하지만 현재 다양한 분야에 응용되고 있는 투명전극 소재인 Indium tin oxide (ITO)를 대체하기에는 아직 이른 실정이다. 또 다른 투명전극 응용 소재인 silver nanowire는 전기 전도성이 우수한 반면 투명 전극으로서 두께가 두꺼워질수록 Haze 발생과 기판과의 부착력, 박막형성 뒤의 내구성 문제가 있다. 본 연구에서는 상기 두 재료를 결합하여 복합 전극을 만들어 두 재료의 복합 비율에 따른 투명성과 전기 전도성을 비교하였다.

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A Conductive-grid based EMI Shielding Composite Film with a High Heat Dissipation Characteristic (전도성 그리드를 활용한 전자파 흡수차폐/방열 복합소재 필름)

  • Park, Byeongjin;Ryu, Seung Han;Kwon, Suk Jin;Kim, Suryeon;Lee, Sang Bok
    • Composites Research
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    • 제35권3호
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    • pp.175-181
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    • 2022
  • Due to the increasing number of wireless communication devices in mmWave frequency bands, there is a high demand for electromagnetic interference (EMI) shielding and heat dissipating materials to avoid device malfunctions. This paper proposes an EMI shielding composite film with a high heat dissipation characteristic. To achieve this, a conductive grid is integrated with a polymer-based composite layer including magnetic and heat dissipating filler materials. A high shielding effectiveness (>40 dB), low reflection shielding effectiveness (<3 dB), high thermal conductivity (>10 W/m·K), thin thickness (<500 ㎛) are simultaneously achieved with a tailored design of composite layer compositions and grid geometries in 5G communication band of 26.5 GHz.

나노 전도성 Filler를 이용한 박막 고분자 PTC 특성 연구

  • 강영구;조명호
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 한국안전학회 2003년도 추계 학술논문발표회 논문집
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    • pp.351-354
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    • 2003
  • 최근 안전 분야에서 기능성 고분자 재료의 응용분야로서 첨단 전기전도성 고분자복합재료를 이용한 섬유상, 구형, flake 등 각종 형상의 금속, 흑연, carbon black, whisker 등의 전도성 filler를 고분자 matrix에 혼입하여 전도성 고분자를 성형가공하여 복합성형체를 제조하고 electrical hazard를 감소시키기 위한 정전기방지효과, 자기발열체, 전자기파 차폐효과 등의 특성을 나타내는 고분자 성형체상으로 가공된 소재로 화학공장, 산업설비, 각종 제조설비의 제조 공정용 제어, 과전류차단 및 외부 전자기파에 의해 발생되는 이상작동 등을 방지하는 안전시스템 소재용으로서 다양하게 사용되고 있다.(중략)

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Preparation and Characterization of Conducting Composites Impregnated with Thick Polyheterocyclic Polymers (전도성 복합소재의 합성과 특성연구)

  • Park, Jun-Seo
    • Applied Chemistry for Engineering
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    • 제9권3호
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    • pp.342-347
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    • 1998
  • Light-weight conductive polymer composites were prepared by incorporating polyheterocycles such as polypyrrole and polythiophene into pores of a highly porous cross-linked polystyrene, host polymer, to form a conductive network. The highly hydrophobic and porous host polymer was synthesized by concentrated emulsion polymerization method. Polypyrrole-based composites, prepared by employing ferric chloride-methanol system, showed a conductivity as high as 0.82 S/cm. Conductivity of polythiophene-based composites, prepared from ferric chloride-acetonitrile system, was 6.05 S/cm. Conductivity of compositivity was influenced by the initial molar ratio of oxidant to monomer as well. SEM micrographs of the composites showed that conducting polymer coated uniformly the inside wall of the porous host polymer. Shielding effectiveness of the polypyrrole-based composites and of the polythiophene-based composites were 15.2 dB and 22.5 dB at 2.0 GHz, respectively. In the temperature range from 20 to 300K, a polypyrrole impregnated composite exhibited seimiconducting behavior and followed the variable range hopping(VRH) model for charge transport.

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Electromagnetic Shielding Polymer Composites with Segregated Structure for Automotive Part Application: A Review (자동차 부품 적용을 위한 Segregated structure를 갖는 전자파 차폐용 고분자 복합소재 연구동향)

  • Lee, Jinwoo;Suhr, Jonghwan
    • Composites Research
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    • 제35권4호
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    • pp.223-231
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    • 2022
  • With the rapid growth of the future mobility market, a large number of electronic parts are being used in automobile, and the importance of electromagnetic interference (EMI) shielding in the automobile market is growing to minimize malfunctioning among the parts. Accordingly, conductive polymer composites (CPCs) are getting a lot of attention as EMI shielding materials for the automotive, but there are still challenges in CPCs like high content of conductive filler to achieve proper EMI shielding effectiveness, and poor mechanical properties. This paper introduces main methods to manufacture CPCs with segregated filler structure, which can significantly reduce the filler content, and analyzes EMI shielding performance of each manufacturing method.

The Electrochemical Characterization of Conducting Polymer-Lignin Composite (전도성 고분자-리그닌 복합소재의 전기화학적 특성 분석)

  • Bae, Joonwon
    • Applied Chemistry for Engineering
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    • 제33권2호
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    • pp.210-215
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    • 2022
  • Two types of lignin materials with a different surface ionic character were used and polypyrrole layer was introduced on the lignin surface to obtain polypyrrole@lignin and polypyrrole@lignosulfonate composites using a simple chemical oxidation polymerization, reported in a previous article. Polypyrrole was effectively prepared regardless of the lignin type and the resulting composites were investigated using scanning electron microscope (SEM), cyclic voltammetry (CV), and impedance analysis. SEM and CV results showed that the obtained composites retained stable electrochemical properties after introduction of polypyrrole on the lignin surface. Impedance analyses showed that the surface properties of composites were dependent on lignin characteristics. In addition, the composites were embedded in agarose, an gelifying agent, to obtain conductive gels. It was found that the conductive gels possessed an electrical conductivity and also retained stable electrochemical properties, which indicated that the conductive gels might be useful for some applications.

Preparation of Hydrogels Containing Polypyrrole@lignin Hybrids and Application in Sensors (전도성 고분자/리그닌 복합소재를 함유한 하이드로젤의 제조 및 센서 응용)

  • Park, Sun Young;Park, Soyeon;Kim, Hye Jun;Im, Youngsoon;Bae, Joonwon
    • Applied Chemistry for Engineering
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    • 제31권4호
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    • pp.411-415
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    • 2020
  • In this article, the preparation of hydrogels containing conducting polymer@lignin hybrids and their application to sensing materials were demonstrated using diverse techniques. A conducting polymer, polypyrrole (PPy) was polymerized on the surface of lignin and successful formation was analyzed with Fourier-transform infrared spectroscopy and scanning electron microscopy. Subsequently, PPy@lignin hybrids were mixed with a hydrogel matrix to obtain a conductive hydrogel. The feasibility of using the hydrogel as a sensing material was shown by obtaining reasonable sensing signals using various electrical measurements when adding solvents and solutions to the sensor system. The significance of sensor signals was confirmed with complementary experiments. This study shows that the hydrogel containing the PPy@lignin could be used for sensor applications.

Electrical and the Mechanical Properties of Graphite particle/carbon fiber hybrid Conductive Polymer Composites (흑연입자/탄소섬유 혼합 보강 전도성 고분자 복합재료의 전기적, 기계적 특성 연구)

  • Heo Seong-Il;Yun Jin-Cheol;Oh Kyung-Seok;Han Kyung-Seop
    • Composites Research
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    • 제19권2호
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    • pp.7-12
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    • 2006
  • Graphite particle/carbon fiber hybrid conductive polymer composites were fabricated by the compression molding technique. Graphite particles were mixed with an epoxy resin to impart the electrical conductivity in the composite materials. In this study, graphite reinforced conductive polymer composites with high filler loadings were manufactured to accomplish high electrical conductivity above 100S/cm. Graphite particles were the main filler to increase the electrical conductivity of composites by direct contact between graphite particles. While high filler loadings are needed to attain good electrical conductivity, the composites becomes brittle. So carbon fiber was added to compensate weakened mechanical property. With increasing the carbon fiber loading ratio, the electrical conductivity gradually decreased because non-conducting regions were generated in the carbon fiber cluster among carbon fibers, while the flexural strength increased. In the case of carbon fiber 20wt.% of the total system, the electrical conductivity decreased 27%, whereas the flexural strength increased 12%.

Fabricaton of PEMFC separators with conducting polymer composites by injection molding process and evaluation of moldability and electrical conductivity of the separators (전도성 복합재료를 이용한 PEMFC용 separator 사출성형 제조 및 전기전도성 평가)

  • Yoon, Yong-Hun;Lim, Seung-Hyun;Kim, Dong-Hak
    • Journal of the Korea Academia-Industrial cooperation Society
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    • 제11권4호
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    • pp.1361-1366
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    • 2010
  • This research aims to develop polymer composites which can be used for PEMFC separators by injection molding process. Considering the moldability and stiffness, we used PPS(Poly(phenylene sulfide)) and PP(Polypropylene) as base resin. In order to improve electrical conductivity and physical properties, we chose glass fiber, carbon fiber, carbon black, and both expanded graphite and synthetic graphite. The 3 type composites are prepared for injection molding of PEMFC separators. and CAE(Computer Aided Engineering) analysis was conducted to optimize injection processing parameters(injection pressure, heat time, mold temperature etc.). We did successfully fabricate the separators by injection molding, and measure the electrical conductivity of the samples by using four point probe device. Conclusively, PP/SG/CB composite showed better both electrical conductivity and moldability than the others.