原位化学氧化接枝聚苯胺包覆粉煤灰漂珠及其电流变特性研究

项目名称： 原位化学氧化接枝聚苯胺包覆粉煤灰漂珠及其电流变特性研究

项目编号： No.51204131

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 雷西萍

作者单位： 西安建筑科技大学

项目金额： 25万元

中文摘要： 聚苯胺由于密度、导电控制、环境稳定性和对电流变设备无腐蚀等特点已成为电流变液的主要研究对象，但是，聚苯胺聚集性强导致分散性差以及电流密度高，应用受限，通常将其与无机材料复合、掺杂、包覆以改善其电流变效果。粉煤灰漂珠是粉煤灰中密度最小的一种，且其热阻大、强度高等特性，在建材行业得到了广泛的应用，但作为电流变材料使用未见报道。本课题首先采用浮选法分离漂珠，再以3-氨丙基三乙氧基硅烷为偶联剂对其表面进行修饰，通过原位化学氧化法使苯胺在漂珠表面发生聚合，获得核/壳结构聚苯胺包覆粉煤灰漂珠复合材料，对其化学结构、热稳定性、介电性能进行测试；以二甲基硅油为基础液，复合材料为分散相，分析不同浓度下电流变液的表观粘度、剪切应力以及沉降率的变化规律，对电流变特性相关的流变性能、力学性能、沉降性能进行评价，阐明漂珠对聚苯胺电流变特性的影响规律及作用机理，建立分散相浓度与电流变特性之间的响应关系。

中文关键词： 粉煤灰漂珠；聚苯胺；表面活性剂；电性能；电流变效应

英文摘要： Polyaniline(PAn) has been growing concern as electrorheological fluid(ERF) due to its density, conductivity controllability, stability to environment and little of corrosion to apparatus. However, it is still limited to be applied because of strong aggregation leading to bad dispersity and high current density. Usually it can be composited, doped and coated with inorganic matters to improve the electrorheological properties. Float fly ash bead(FFAB) is one of fly ash which has the lowest density and has been applied in building material industry widely for its excellent heat resistance and high strength, but it is novel to be used as ERF. Firstly, FFAB is separated by flotation method in this subject, then 3-aminopropyl triethoxysilane(APTES) is introduced to couple with FFAB and then,FFAB-APTES is obtained. After that, aniline polymerize on the surface of FFAB-APTES,then the FFAB-APTES/PAn composites with core/shell structure are synthesized by in situ chemical oxidative grafting polymerization. The chemical structure, heat stability and dielectric property of the composites are characterized. Next, the rheological property, sedimentation and mechanical property of the ERF with FFAB-APTES/PAn as dispersed phase and dimethicone as basic liquid are evaluated by apparent viscosity, sedimentation ratio and shear st

英文关键词： fly ash floating bead；polyaniline；surfactant；electric property；electrorheological effect