Further experimental investigation and theoretical analysis on the structure and properties of undoped and doped polyaniline are carried out by using several inspecting methods and instruments . using fuming sulfuric acid sulfonating emeraldine base ( eb ) , sulfonated polyaniline ( span ) is synthesized . the results show that it has higher solubility and good conductivity , span with different sulfonation . degree ( sd ) possesses different conductivity 借助于一系列的现代分析手段对本征态及掺杂态的聚苯胺的电学、光学、热学等性能进行了分析，结果表明，本征态聚苯胺具有高的热稳定性，不同酸掺杂的聚苯胺具有不同的光学、电学性能。
