Abstract: Self-prontonated sulfonic acid-substituted polyaniline compositions, processes for their preparation and uses therefor are disclosed. The sulfonated polyaniline compositions have faster electronic and optical responses to electrochemical potentials comparing to its parent polyaniline, improved environmental stability, and improved solubility than the parent polymer, polyaniline. A process for producing the sulfonated polyaniline compositions comprises reacting the polyaniline polymer with concentrated sulfuric acid. The sulfonated polyaniline compositions are useful for switching an electrochemical response between a conducting and a nonconducting state. The sulfonated polyaniline compositions are also useful for conduction of electricity, absorption of electromagnetic radiation, modulation of electromagnetic beams and modification of the electromagnetic response of sulfonated polyaniline compositions by chemical or electrochemical means.

Abstract: Methods for producing fibers of self-protonated sulfonic acid-substituted polyaniline compositions. The sulfonated polyaniline compositions have faster electronic and optical responses to electrochemical potentials comparing to its parent polyaniline, improved environmental stability, and improved solubility than the parent polymer, polyaniline.

Abstract: Multicomponent polymeric compositions comprising self-prontonated sulfonic acid-substituted polyaniline compositions or derivatives thereof and at least one insulating polymer are disclosed. The sulfonated polyaniline compositions have faster electronic and optical responses to electrochemical potentials, improved environmental stability, and improved solubility than the parent polymer, polyaniline. The multicomponent sulfonated polyaniline/insulating polymer compositions are useful in electronic, chemical, electrochemical, and optical microelectric applications which use and control the chemical and physical properties of the sulfonated polyaniline compositions.

Abstract: Sulfonic acid-substituted polyaniline compositions and their derivatives are produced by reacting a polyaniline polymer with SO.sub.3 gas. The sulfonated polyaniline compositions have faster electronic and optical responses to electrochemical potentials and improved environmental stability solubility than the parent polyaniline polymer.