以中空多孔聚丙烯腈( polyacrylonitrile,PAN)原丝为原料,通过预氧化和炭化工艺制备了中空多孔炭纤维(Hollow-porous carbon fibres,HPCFs).研究了预氧化时间对其微观结构、元素组成、电导率和介电常数的影响.结果表明:预氧化时间对所获HPCFs微观结构的影响不大;HPCFs的碳含量随预氧化时间增加而减少,而氮含量则随预氧化时间增加而增加.随着预氧化时间增加,所得HPCFs电导率和介电常数依次降低.预氧化时间60 min、炭化温度800℃条件下所制HPCFs在2GHz处的介电常数实部和虚部分别为17.20和11.90,对应的电导率为564.50Ω1·m-1.可通过热处理工艺调节HPCFs的电导率和介电常数.
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