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Received September 16, 2015
Accepted December 8, 2015
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카본블랙이 내첨된 핏치로부터 폴리우레탄 조공제를 이용한 탄소 폼의 제조 및 특성
The Preparation and Property of Carbon Foams from Carbon Black Embedded Pitch Using PU Template
충남대학교 공과대학 정밀응용화학과, 34134 대전시 유성구 궁동 220 1국방과학연구소, 34060 대전시 유성구 수남동 111
Department of Applied Chemistry and Biological Engineering, Chungnam National University, 220, gung-dong, Yuseong-gu, Daejeon, 34134, Korea 1The 4th R&D Institute-4, Agency for Defense Development, 111, Sunam-dong, Yuseong-gu, Daejeon, 34060, Korea
Korean Chemical Engineering Research, April 2016, 54(2), 268-273(6), 10.9713/kcer.2016.54.2.268 Epub 5 April 2016
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Abstract
탄소 폼의 기계적 강도를 향상시키기 위하여, PVA 용액에 다양한 함량의 카본블랙 및 메조페이스 핏치를 첨가하여 폴리우레탄 폼에 함침한 후 열처리를 통하여 카본블랙이 첨가된 탄소 폼을 제조하였다. 탄소 폼의 셀 벽의 두께는 첨가된 카본블랙의 함량에 따라 조절되며, 탄소 폼의 압축강도는 셀 벽의 두께가 증가함에 따라 증가되는 것이 확인되었다. 이에 따라 핏치 함량 대비 5 wt%의 카본블랙을 탄소 폼에 첨가하였을 때 가장 높은 0.44 g/cm3의 겉보기 밀도에서 가장 높은 0.22±0.05 MPa의 압축강도가 얻어졌다. 그러나 탄소 폼의 열전도도는 카본블랙이 첨가되었을 때 오히려 감소하는 것으로 나타났다. 이러한 결과는 탄소 폼에 카본블랙 첨가로 인한 흑연 층간 간격(d002)의 증가로 탄소 폼의 열전도도가 오히려 감소되는 것으로 나타났다.
To improve mechanical strength of carbon foams, the carbon black (CB) added carbon foams were fabricated by impregnating different contents of carbon black (CB) and mesophase pitch using polyvinyl alcohol (PVA) solution into polyurethane foam and being followed by heat treatment. The cell wall-thicknesses of carbon foams were controlled by adding amounts of CB, and it was confirmed that the compressive strength of carbon foams was increased as increasing cell wall-thickness. The compressive strength had the highest value of 0.22±0.05 MPa with the highest bulk density of 0.44 g/cm3 when adding 5 wt% CB in carbon foam. However, the thermal conductivity was decreased by adding CB in carbon foam. The results indicated that the thermal conductivities of carbon foams were reduced by increased interlayer spacing (d002) with the addition of CB in carbon foams.
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