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 : Mi Jung Yoo, Hyo Jun Ko, Yun-Soo Lim and Myung-Soo Kim
ㆍ저자명 : Mi Jung Yoo, Hyo Jun Ko, Yun-Soo Lim and Myung-Soo Kim
목차
1. Introduction2. Experimental
3. Results and Discussion
4. Conclusions
Acknowledgements
References
한국어 초록
In this work, thermal treatment accompanied with different acid treatments was applied toa 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 between380°C and 400°C was required to obtain a softening point (SP) range of 220°C-260°C andmany 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, theprecursor 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 andthe formation of meso-phase was suppressed due to the lower reaction temperatures. Sincethe precursor pitches with acid and thermal treatment were not spinnable due to the inhomogeneityof properties such as molecular weight distribution and viscosity, the CTP was mixedwith ethanol before the consecutive nitric acid and thermal treatments. The precursor pitcheswith ethanol, nitric acid, and thermal treatments were easily spinnable, and their spinningand carbon fiber properties were compared to those of air blowing and thermal treated CTP.영어 초록
In this work, thermal treatment accompanied with different acid treatments was applied toa 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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