聚苯胺@粉煤灰漂珠复合材料的导电及介电性能

为获得具有良好电流变性能的分散相粒子,利用γ-氨基丙基三乙氧基硅烷(APTES)修饰粉煤灰漂珠(FAFB),将聚苯胺(PAn)以化学键的方式偶联在修饰后的FAFB(mod-FAFB)表面,形成以mod-FAFB为核、PAn为壳的核-壳结构复合材料。采用FTIR、SEM、数字式四探针以及LCR介电谱仪对PAn@mod-FAFB复合材料的结构与性能进行分析,讨论了不同mod-FAFB含量对PAn@mod-FAFB复合材料导电性能及介电性能的影响。结果表明:以化学键接枝聚合的PAn@mod-FAFB核-壳结构复合材料电导率相对较高,且随mod-FAFB含量的增加而减小;在较低交变电场频率(100~2 000kHz)下其相对介电常数较大,且随mod-FAFB含量的增多,PAn@mod-FAFB复合材料的介电常数明显减小;PAn@mod-FAFB复合材料的介电损耗相对较小,随mod-FAFB含量的增多而急剧减小。

Conductivity and dielectric properties of polyaniline @ fly-ash floating beads composites

In order to obtain dispersed phase particles with good electrorheological property,γ-amino propyl triethoxy silane (APTES) was used to modify fly-ash floating beads. Polyaniline (PAn) was coupled with chemical bonds to form core-shell structural composites, with mod-FAFB as core and PAn as shell on the surfaces of decorated FAFB (mod-FAFB). The structure and performance of PAn@mod-FAFB composites were analyzed by FTIR, SEM, digital four point probe technique and LCR dielectric spectrometer. The effect of different contents of mod-FAFB on conductivity and dielectric properties of PAn@mod-FAFB composites were researched.The results show that PAn@mod-FAFB core-shell structural composites with chemical bond graft polymerization have a relatively high electrical conductivity, and the electrical conductivity decreases with the increasing content of mod-FAFB. The relative dielectric constant is higher at low alternating electric field frequency (100-2 000 kHz), and dielectric constant of PAn@mod-FAFB composites decreases obviously with the increasing of mod-FAFB content. The dielectric loss of PAn@mod-FAFB composites is relatively low, and decreases obviously with the increasing of mod-FAFB content.