Modification of isotropic coal-tar pitch by acid treatments for carbon fiber melt-spinning
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon letters / 15권 / 4호
ㆍ저자명 : Yoo, Mi Jung, Ko, Hyo Jun, Lim, Yun-Soo, Kim, Myung-Soo
ㆍ저자명 : Yoo, Mi Jung, Ko, Hyo Jun, Lim, Yun-Soo, Kim, Myung-Soo
목차
Abstract1. Introduction
2. Experimental
2.1. Raw pitch
2.2. Pitch modification
2.3. Preparation of carbon fibers
2.4. Characterization of precursor pitches and carbon fibers
3. Results and Discussion
3.1. Characterization of raw and modified pitches
3.2. Properties of carbon fibers
4. Conclusions
Acknowledgements
References
영어 초록
In this work, thermal treatment accompanied with different acid treatments was applied to a commercial coal tar pitch (CTP) to obtain a spinnable precursor pitch for carbon fiber. In the case of thermal treatment only, a relatively high reaction temperature of between 380˚C and 400˚C was required to obtain a softening point (SP) range of 220˚C-260˚C and many meso-phase particles were created during the application of high reaction temperature. When nitric acid or sulfuric acid treatment was conducted before the thermal treatment, the precursor pitch with a proper SP range could be obtained at reaction temperatures of 280˚C-300˚C, which were about 100˚C lower than those for the case of thermal treatment only. With the acid treatments, the yield and SP of the precursor pitch increased dramatically and the formation of meso-phase was suppressed due to the lower reaction temperatures. Since the precursor pitches with acid and thermal treatment were not spinnable due to the inhomogeneity of properties such as molecular weight distribution and viscosity, the CTP was mixed with ethanol before the consecutive nitric acid and thermal treatments. The precursor pitches with ethanol, nitric acid, and thermal treatments were easily spinnable, and their spinning and carbon fiber properties were compared to those of air blowing and thermal treated CTP.참고 자료
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