Modification of isotropic coal-tar pitch by acid treatments for carbon fiber melt-spinning

• 영문명: Modification of isotropic coal-tar pitch by acid treatments for carbon fiber melt-spinning
• 발행기관: 한국탄소학회
• 저자명: Mi Jung Yoo Hyo Jun Ko Yun-Soo Lim and Myung-Soo Kim
• 간행물 정보: 『Carbon Letters』제15권 제4호, 247~254쪽, 전체 8쪽
• 주제분류: 자연과학 > 자연과학일반
• 파일형태: PDF
• 발행일자: 2014.10.31

영문 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.

목차

1. Introduction

2. Experimental

3. Results and Discussion

4. Conclusions

Acknowledgements

References

키워드

coal tar pitch acid treatment carbon fiber melt-spinning