新型炭材料2011，Vol.26Issue(6)：441-445,5.
预氧化时间对中空多孔炭纤维介电常数的影响
Effect of oxidation time on the complex permittivity of hollow, porous carbon fibers
摘要
Abstract
Polyacrylonitrile-based hollow, porous carbon fibers (PAN-HPCFs) as lightweight radar wave absorbers were prepared by the oxidation of PAN hollow fibers in air followed by carbonization in nitrogen. The effects of oxidation time and carbonization temperature on the microstructure, composition, electrical conductivity and complex permittivity of the resulting PAN-HPCFs were investigated. Results indicated that heat-treatment parameters had no obvious effect on the microstructure of the PAN-HPCFs. The carbon content of the PAN-HPCF decreased, the nitrogen content increased and the electrical conductivity decreased with oxidation time. The real and imaginary parts of the complex permittivity (ε' and ε") decreased with oxidation time. The electrical conductivity and complex permittivity of the PAN-HPCFs can be adjusted by changing the heat-treatment parameters. The values of ε' and ε" of PAN-PHCFs were 17. 20 and 11. 90 respectively and the electrical conductivity was 564.50Ω-1m·-1 when oxidation time was 60 min and carbonization temperature was 800℃.关键词
中空多孔炭纤维/氧化/炭化/介电常数Key words
Hollow-porous carbon fibers/Pre - oxidation/Carbonization/Complex permittivity分类
化学化工引用本文复制引用
谢炜,陈朝辉,程海峰,楚增勇,匡加才..预氧化时间对中空多孔炭纤维介电常数的影响[J].新型炭材料,2011,26(6):441-445,5.基金项目
国家自然科学基金(50403010),湖南省自然科学基金(08JJ3100),湖南省科技计划项目(2010FJ4094). （50403010）
