以中空多孔聚丙烯腈(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.研究了预氧化温度对其微观结构、元素组成和介电常数的影响.结果表明,预氧化温度对中空多孔炭纤维微观结构的影响不大;碳含量随预氧化温度的升高而减少,而氮、氧含量则相反.随预氧化温度的升高,所得中空多孔炭纤维的介电常数依次降低.在2GHz处,预氧化温度为250℃时ε′和ε″分别为23.12和73.51,而预氧化温度为310℃时ε′和ε″分别为19.32和9.87.因此,可通过预氧化温度来调节中空多孔炭纤维的介电常数.
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