Effect of Heating Rate on the Complex Permittivity of Hollow-porous Carbon Fibers

doi:10.3724/SP.J.1077.2011.00939

Journal of Inorganic Materials ›› 2011, Vol. 26 ›› Issue (9): 939-943.DOI: 10.3724/SP.J.1077.2011.00939

• Research Paper • Previous Articles Next Articles

Effect of Heating Rate on the Complex Permittivity of Hollow-porous Carbon Fibers

XIE Wei¹, CHENG Hai-Feng², KUANG Jia-Cai³, CHEN Zhao-Hui², CHU Zeng-Yong², LONG Chun-Guang¹

(1. College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China; 2. Key Lab of Advanced Ceramic Fibers & Composites, National University of Defense Technology, Changsha 410073, China; 3. Institute of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China)

Received:2010-11-19 Revised:2010-12-27 Published:2011-09-20 Online:2011-08-19
Supported by:
National Natural Science Foundation of China (50403010); Natural Science Foundation of Hunan (08JJ3100); The Planned Science and Technology Project of Hunan Province (2010FJ4094)

Abstract

Abstract: A series of polyacrylonitrile-based hollow-porous carbon fibres (PAN-HPCFs) were prepared by oxidating PAN hollow-porous fibers in air and carbonizing their cured fibers in nitrogen. The effects of preoxidation and carbonization heating rate on the microstructure, composition, electrical volume conductivity and complex permittivity were investigated. The microstructure of the obtained PAN-HPCFs is changed greatly by the heating rate. The electrical volume conductivity and complex permittivity decrease with the increase of heating rate. The electrical volume conductivity is in the range 1997.14 S/m to 153.39 S/m with the preoxidation heating rate increasing from 0.5℃/min to 4℃/min. At 2 GHz, the value of ε″ of composites of paraffin and PAN-PHCFs decreases from 70.35 to 6.99 when preoxidation heating rate increases form 0.5℃/min to 4℃/min. Results indicate that the electrical conductivity and complex permittivity of PAN-HPCFs can be adjusted by the heating rate.

Key words: hollow-porous carbon fibers, preoxidation, carbonization, complex permittivity

CLC Number:

TB34

XIE Wei, CHENG Hai-Feng, KUANG Jia-Cai, CHEN Zhao-Hui, CHU Zeng-Yong, LONG Chun-Guang. Effect of Heating Rate on the Complex Permittivity of Hollow-porous Carbon Fibers[J]. Journal of Inorganic Materials, 2011, 26(9): 939-943.

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Effect of Heating Rate on the Complex Permittivity of Hollow-porous Carbon Fibers

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