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采用原位聚合法制备PANI/高岭土核壳结构复合材料,研究了反应条件对复合材料电导率的影响,分析了复合产物微观形貌及热稳定性的变化。结果表明:高岭土层状不规则断裂面具有吸附作用,使苯胺在高岭土表面发生聚合,同时高岭土的二维层状结构起到隔热屏障作用,最终形成具有一定导电和耐热性能的复合材料。SEM和XRD分析显示PANI仅包覆在高岭土表面并未进入层间结构;FT-IR分析得出复合物具有PANI和高岭土的特征吸收峰;TG显示复合物具有良好耐热性,在268℃开始失重,最大失重率仅为9%;复合材料最高电导率达0.86S·cm-1。确定了各组分最佳配比:苯胺/APS=1/1.5(摩尔比),苯胺/高岭土=2/5(质量比),反应体系pH=1,反应温度25℃,产物综合性能最佳。
The in-situ polymerization was used to prepare PANI / kaolin core-shell composite. The influence of reaction conditions on the electrical conductivity of the composite was investigated. The changes of the morphology and thermal stability of the composite were analyzed. The results show that kaolinite layered irregular fractured surface has the adsorption effect, which makes the aniline polymerize on the surface of kaolin. At the same time, the two-dimensional layered structure of kaolin plays the role of thermal barrier, finally forming a composite material with certain electrical and thermal properties. SEM and XRD analysis showed that PANI only coated on the surface of kaolin did not enter the interlayer structure; FT-IR analysis showed that the complex with PANI and kaolin characteristic absorption peak; TG showed that the complex has good heat resistance, beginning at 268 ℃ Weight loss, the maximum weight loss rate was only 9%; the highest conductivity of composite materials 0.86S · cm-1. The optimum ratio of each component was determined: aniline / APS = 1 / 1.5 (molar ratio), aniline / kaolin = 2/5 (mass ratio), pH = 1 and reaction temperature 25 ℃ .