摘要
利用固体合金化方法,制备了不同质量比的聚醚醚酮(PEEK)/多壁碳纳米管(MWNT)复合材料,通过场发射扫描电镜观察了凝聚态结构;对比研究了缓冷和速冷模压成型复合材料的熔融吸热峰和热焓的变化、交流电性能参数。结果表明:固体合金化方法能实现MWNT在PEEK基体中的短切与良好分散,有利于导电网络的形成;添加MWNT可促使低温晶相的形成;随MWNT含量的增加,PEEK/MWNT复合材料低温结晶相的熔融峰更加明显;速冷成型能降低复合材料的结晶度,增大晶粒尺寸分布,促进不同尺度晶粒晶界处形成不同长度MWNT的导电网络,有效降低材料的电阻和体系的逾渗阈值;PEEK/MWNT复合材料的交流电性能参数随频率和MWNT含量的变化而变化,但缓冷成型和速冷成型具有不同的临界频率和逾渗阈值。
Polyetheretherketone(PEEK)/ multi-walled carbon nanotubes(MWNTs) composites with different mass ratios were prepared by solid alloying;the condensed structures were observed by field emission scanning electron microscope;melt endothermic peaks,melt enthalpy and AC electrical properties of two kinds of composites prepared by slow cooling and rapid cooling were compared.The results showed that MWNT could be cut short and dispersed well in PEEK matrix by solid alloying,which was benefit to form condensed;the f...
出处
《航空材料学报》
EI
CAS
CSCD
2008年第5期83-88,共6页
Journal of Aeronautical Materials
关键词
多壁碳纳米管
聚醚醚酮
交流电性能
逾渗阈值
临界频率
multi-walled carbon nanotube
polyetheretherketone
AC electrical property
percolation threshold
critical frequency
