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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。
In order to obtain dispersed phase particles with good electrorheological properties, FAFB was modified with γ-aminopropyltriethoxysilane (APTES), and polyaniline (PAn) was chemically bonded to the modified After the FAFB (mod-FAFB) surface, the formation of mod-FAFB as the core, PAn shell of the core-shell structure of the composite material. The structure and properties of PAn @ mod-FAFB composites were analyzed by FTIR, SEM, digital four-probe and LCR dielectric spectrometer. The effects of different mod-FAFB content on the electrical properties of PAn @ mod-FAFB composites, The impact of electrical properties. The results show that the conductivity of PAn @ mod-FAFB core-shell composites grafted by chemical bonding is relatively high and decreases with the increase of mod-FAFB content. At lower alternating electric field frequency (100-2000 kHz ), The dielectric constant of PAn @ mod-FAFB composites decreases obviously with the increase of mod-FAFB content. The dielectric loss of PAn @ mod-FAFB composites is relatively small with the increase of mod- mod-FAFB content increased sharply reduced.