Synthesis and electrorheological characteristics of polyaniline-coated poly(methyl methacrylate) microsphere: Size effect
Synthesis and electrorheological characteristics of polyaniline-coated poly(methyl methacrylate) microsphere: Size effect
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DOI：
10.1021/la026969d
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发表时间：
2003-07-08
期刊：
影响因子：
3.9
通讯作者：
Jhon, MS
中科院分区：
文献类型：
--
作者：
Cho, MS;Cho, YH;Jhon, MS
制备了由聚甲基丙烯酸甲酯（PMMA）核和聚苯胺（PANI）壳组成的球形单分散聚合物微球（PAPMMAs），并将其作为电流变（ER）流体的分散材料，其导电性主要来源于表面涂覆的导电PANI层。这些表面粗糙而不规则。制备了三种不同核尺寸（2、4.5和9微米）的聚苯胺聚丙烯腈聚合物，核尺寸越大，聚苯胺壳越厚。制备了壳厚相近但芯尺寸不同的PAPMMAs，考察了粒径对内电性能的影响。papma基ER流体的性能随岩心粒径的增大而增强。对于具有相同壳厚的PAPMMA体系，得到了相同的结果。研究发现，这些内质网流体的介电光谱为分析其电极化特性和解释基于papma的内质网流体的流动行为提供了额外的信息。
The spherical, monodisperse polymer microshperes (PAPMMAs) consisting of a poly(methyl methacrylate) (PMMA) core and a polyaniline (PANI) shell were prepared and adopted as dispersed materials for electrorheological (ER) fluids, in which electrical conductivity was originated primarily from the surface-coated conducting PANI layer. These surfaces were rough and irregular. Three different core sizes of PAPMMAs (2, 4.5, and 9 mum) with the same weight ratio of PANI, the larger core having the thicker PANI shell, were prepared. PAPMMAs that have similar shell thicknesses but different core sizes were also prepared in order to examine the particle size effect on ER performance. Performances of PAPMMA-based ER fluids were enhanced with increasing core particle size. The same result was obtained for the PAPMMA systems having the same shell thickness. Dielectric spectra of these ER fluids were found to provide additional information on both analyzing their electrical polarization properties and interpreting the flow behavior of the PAPMMA-based ER fluids.