磺基水杨酸掺杂聚苯胺/石墨复合粉体的研究

A STUDY ON DOPING POLYANILINE/GRAPHITE NANOCOMPOSITES WITH SULFOSALICYLIC ACID

研究了磺基水杨酸(SSA)对PANi/EP的机械力化学掺杂作用,通过电导率测定、SEM观察和FT-IR研究了体系的导电性能和掺杂机理。结果表明,SSA与PANi/EP粉体按照一定比例共碾磨,在复合粉体与SSA质量比为2.5时,共碾磨90min电导率达到最高值0.438S/cm,105℃退火2h,测试其电导率为2.762S/cm,提高了约5倍,但仍低于盐酸掺杂样品。可见高熔点有机酸对聚苯胺的固相机械力化学掺杂,避免了溶剂体系对环境的污染,是一种低成本绿色工艺。SEM表明,SSA掺杂PANi/EP复合粉体具有疏松多孔不规则形貌特征,粒径大小在0.5μm～1μm;FT-IR比较发现,SSA的特征峰3113cm-1消失,1667cm-1减弱并发生左移,1068cm-1和1582cm-1合并成一个1582cm-1峰。表明SSA与PANi/EP发生了化学反应,即SSA与PANi/EP发生了掺杂。

Polyaniline (PANi)/graphite conducting composites were prepared by in-situ polymerization of aniline on expanded graphite (EP) according to its layered structure. Sulfosalicylic acid was used in doping PANi/EP composites in this paper. Compared with traditional proton acid, doping the PANi/EP with sulfosalicylic acid can greatly improve the processing ability and conductive stability through solid-state mechanochemical reaction, at same time consume and pollution of solvent abstain, which is a green technology. The doping mechanism was discussed according to results of FT-IR and SEM. Milling the composites with sulfosalicylic acid for 90 min at room temperature, the electric conductivity reaches (0.438) S/cm from (0.413) S/cm, annealing the doped composites for 2 h at 105 ℃, the conductivity increases to (2.762) S/cm. The doped composites particles are observed as disorder column, about (0.5) μm^1 μm. FT-IR shows 3113 cm^(-1) characteristic absorbed peak of sulfosalicylic acid in the doped composites almost disappears, 1667 cm^(-1) characteristic absorbed peak moves to 1672 cm^(-1).