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采用与传统制备方法不同的加料顺序,即将苯胺单体溶液滴加到过硫酸铵氧化剂溶液中,制备了具有珊瑚状表面形貌的聚苯胺亚微米级颗粒.扫描电子显微镜(SEM)表征表明这种聚苯胺颗粒的表面形貌非常的粗糙,并有大量纳米级的小凸起.使用3种不同的聚乙烯醇(PVA),即1799、1788和CP-1000,为稳定剂,得到的聚苯胺颗粒分别为PANI-1、PANI-2和PANI-3,均具有珊瑚状表面形貌.颗粒的平均尺寸分别为250,215和140 nm.颗粒的尺寸分布也随尺寸的降低而明显变窄.可见,稳定剂PVA在水中溶解性的好坏和分子量大小对聚苯胺颗粒的聚集程度和尺寸大小有很大的影响.通过傅里叶变换红外光谱(FTIR),热失重分析(TGA),粉末X-射线衍射(XRD),四探针电导率测试仪和N2吸脱附表征对得到的聚苯胺颗粒的化学结构、热稳定性、结晶结构、电性能和比表面积进行了全面的表征.聚苯胺颗粒的电导率可以达到2.7 S·cm-1.对珊瑚状表面形貌的形成机理进行了探讨.
A series of polyaniline sub-micron particles with a coral-shaped surface morphology were prepared by dropping the aniline monomer solution into the ammonium persulfate oxidant solution by using a different feeding order than that of the traditional preparation method. Scanning electron microscopy (SEM) The polyaniline particles have a very rough surface morphology with a large number of nano-scale protrusions. Three different polyvinylalcohols (PVA), namely 1799, 1788 and CP-1000, were used as stabilizers. The resulting poly The aniline particles were PANI-1, PANI-2 and PANI-3, respectively, with coral morphology. The average size of the particles was 250, 215 and 140 nm, respectively. The size distribution of the particles was also significantly narrower with decreasing size. The solubility of PVA in water and the molecular weight of PVA have a great influence on the aggregation degree and size of polyaniline particles.FTIR, TGA, The chemical structure, thermal stability, crystal structure, electrical properties and specific surface area of polyaniline particles were characterized by X-ray diffraction (XRD), four-probe conductivity meter and N2 adsorption- The conductivity of the particles can be reached 2.7 S · cm-1. The formation mechanism of coral-like surface morphology is discussed.