Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Fabrication and Characteristics of Mesophase Pitch-Based Graphite Foams Prepared Using PVA-AAc Solution

PVA-AAc 용액을 사용한 메조페이스 핏치기반 그라파이트 폼의 제조 및 특성

  • Kim, Ji-Hyun (Department of Applied Chemistry and Biological Engineering, Chungnam National University) ;
  • Lee, Sangmin (Department of Applied Chemistry and Biological Engineering, Chungnam National University) ;
  • Jeong, Euigyung (The 4th R&D Institute-4, Agency for Defense Development) ;
  • Lee, Young-Seak (Department of Applied Chemistry and Biological Engineering, Chungnam National University)
  • 김지현 (충남대학교 공과대학 바이오응용화학과) ;
  • 이상민 (충남대학교 공과대학 바이오응용화학과) ;
  • 정의경 (국방과학연구소) ;
  • 이영석 (충남대학교 공과대학 바이오응용화학과)
  • Received : 2015.09.16
  • Accepted : 2015.11.11
  • Published : 2015.12.10
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Abstract

Graphite foams (GFs) were prepared by adding different amounts of mesophase pitch (MP) into polyvinyl alcohol-acrylic acid (PVA-AAc) solution followed by the heat treatment. It was confirmed that the pore diameters of GFs were controlled by the slurry concentration, which was the mesophase content added in polymer solution, and their thermal conductivity and compressive strength were also controlled by porosities of GFs formed at different conditions. The resulting GFs in this study had the highest thermal conductivity of $53.414{\pm}0.002W/mK$ and compressive strength of $1.348{\pm}0.864MPa$ at 0.69 in porosity. The thermal conductivity of MP based GFs increased approximately 23 times higher than that of using isotropic pitch based GFs due to the developed graphitic structure.

그라파이트 폼이 polyvinyl alcohol-acrylic acid (PVA-AAc) 용액에 다양한 함량의 메조페이스 핏치(mesophase pitch, MP)를 첨가한 후 열처리를 통해 제조되었다. 그라파이트 폼의 공극 크기는 슬러리 농도(고분자 용액에 첨가된 메조페이스 핏치의 함량)에 따라 조절되며, 그 열 전도도 및 압축강도는 각각의 조건에서 형성된 그라파이트 폼의 공극률에 의해서 조절됨을 확인하였다. 본 실험에서 얻어진 그라파이트 폼은 공극률 0.69에서 $53.414{\pm}0.002W/mK$의 가장 높은 열전도도 및 $1.348{\pm}0.864MPa$의 압축강도 값을 나타내었다. 메조페이스 핏치 기반의 그라파이트 폼의 열전도도는 등방성 핏치 기반의 그라파이트 폼에 비하여 흑연화 구조의 발달로 인하여 그 값이 23배로 크게 증가되었다.

Keywords

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