中文摘要：

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（100～2 000 kHz）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;PAnd@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.

英文摘要：

In order to obtain dispersed phase particles with good electrorheological property , γ-amino propyl trie- thoxy 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 decora- ted 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.