X-ray diffraction analysis of the effect of ball milling time on crystallinity of milled polyacrylonitrile-based carbon fiber

• 발행기관: 한국탄소학회
• 저자명: Sang-Hye Lee Dong-Su Kang Sang-Min Lee Jae-Seung Roh
• 간행물 정보: 『Carbon Letters』 제26권, 11~17쪽, 전체 7쪽
• 주제분류: 자연과학 > 자연과학일반
• 파일형태: PDF
• 발행일자: 2018.04.30

영문 초록

Milled carbon fiber (mCF) was prepared by a ball milling process, and X-ray diffraction(XRD) diffractograms were obtained by a 2θ continuous scanning analysis to study mCF crystallinity as a function of milling time. The raw material for the mCF was polyacrylonitrile-based carbon fiber (T700). As the milling time increased, the mean particle size of the mCF consistently decreased, reaching 1.826 μm at a milling time of 18 h. The XRD analysis showed that, as the milling time increased, the fraction of the crystalline carbon decreased, while the fraction of the amorphous carbon increased. The (002) peak became asymmetric before and after milling as the left side of the peak showed an increasingly gentle slope. For analysis, the asymmetric (002) peak was deconvoluted into two peaks, less-developed crystalline carbon (LDCC) and more-developed crystalline carbon. In both peaks, Lc decreased and d002 increased, but no significant change was observed after 6 h of milling time. In addition, the fraction of LDCC increased. As the milling continued, the mCF became more amorphous, possibly due to damage to the crystal lattices by the milling.

목차

1. Introduction

2. Experimental

3. Results and Discussion

4. Conclusions

키워드

ball mill crystallinity milled carbon fiber PAN-based carbon fiber X-ray diffraction electrical conductivity