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김정담(Jung-dam Kim),김명수(Myung-Soo Kim) 한국고분자학회 2018 폴리머 Vol.42 No.1
피치계 탄소섬유의 제조공정은 방사, 안정화 및 탄화로 나뉘고, 그 중 안정화 공정은 긴 처리시간과 많은 비용을 필요로 한다. 안정화 공정의 최적조건을 결정하기 위하여 안정화가 진행된 정도를 나타내는 SI(stabilization index)를 도입하여 계산하였고, 안정화 조건에 따른 탄화섬유의 물성 변화를 조사하였다. 안정화 시간 0 및 1시간에서, 안정화 온도를 연화점+0~50 ℃로 변화시키면서 안정화섬유 및 탄화섬유의 특성을 분석하였다. 탄화섬유의 기계적 물성 및 전기전도도 특성에 의해 안정화 유지시간 0시간에서 안정화 온도 SP+30 ℃를, 안정화 유지시간 1시간에서 안정화 온도 SP+10 ℃를 최적의 안정화 조건으로 결정하였다. 두 조건에서 안정화 정도에 따라 증가되는 안정화 섬유의 산소의 함량은 약 7.2%이었다. The manufacturing process of pitch-based carbon fiber was divided into spinning, stabilization and carbonization. Among them, the stabilization process requires long time and high cost. In order to determine the optimal stabilization conditions, we calculated the stabilization index (SI), which means the degree of stabilization, and investigated the correlation between SI and physical properties of carbonized fibers with changing the stabilization conditions. With the stabilization times of 0 h and 1 h, the stabilization temperatures were changed from SP+0 ℃ to SP+50 ℃, and the resulting stabilized and carbonized fibers were characterized. For tensile properties and electrical conductivity, a stabilization temperature of SP+30 ℃ with 0 h duration and a stabilization temperature of SP+10 ℃ with 1 h duration were determined as the optimal stabilization conditions. At these conditions, the oxygen contents of stabilized fibers, which increased according to the degree of stabilization, were around 7.2%.
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고분자 첨가에 의한 콜타르 핏치의 결정성 및 탄소섬유 물성 변화
김정담,윤재민,임연수,김명수,Kim, Jung-Dam,Yun, Jae-Min,Lim, Yun-Soo,Kim, Myung-Soo 한국재료학회 2016 한국재료학회지 Vol.26 No.4
In order to use coal tar pitch (CTP) as a raw material for carbon fibers, it should have suitable properties such as a narrow range of softening point, suitable viscosity and uniform optical properties. In this study, raw CTP was modified by heat treatment with three types of polymer additives (PS, PET, and PVC) to make a spinnable pitch for carbon fibers. The yield, softening point, C/H ratio, insoluble yield, and meso-phase content of various modified CTPs with polymer additives were analyzed by changing the type of polymer additive and the heat treatment temperature. The purpose of this study was to compare the properties of CTPs modified by polymer addition with those of a commercial CTP. After the pitch spinning, the obtained green fibers were stabilized and carbonized. The properties of the respective fibers were analyzed to compare their uniformity, diameter change, and mechanical properties. Among three polymer additives, PS220 and PET261 pitches were found to be spinnable, but the carbon fibers from PET261 showed mechanical properties comparable with those of a commercial CTP produced by an air-blowing method (OCI284). The CTPs modified with polymer additive had higher ${\beta}$-resin fractions than the CTP with only thermal treatment indicating a beneficial effect of carbon fiber application.
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