Product Overview

Polyaniline is one of the most important and widely studied intrinsically conductive polymers. Its unique molecular backbone, composed of alternating benzene rings and nitrogen atoms, allows for a dramatic change in conductivity (spanning more than 10 orders of magnitude) from insulator to conductor through reversible protic acid doping. Our emerald green imine basic polyaniline is its most stable intrinsic form, appearing as a deep blue to purple powder. As a key precursor material, it provides the ability to freely adjust its conductivity, optical, and electrochemical properties through chemical or electrochemical doping, thereby meeting diverse high-end needs ranging from anti-corrosion coatings to flexible electronic devices.

Technical Specifications

The following table lists the typical specifications of our Polyaniline (Emeraldine Base). Customized molecular weight and particle size are available upon request.

Key Selling Points and Advantages

Tunable Conductivity Platform: As an intrinsically conductive polymer precursor, polyaniline's conductivity can be easily increased from the insulating level (approximately 10⁻¹⁰ S/cm) to the semiconductor or even conductor level (up to 10²-10³ S/cm) by doping with different protic acids (such as hydrochloric acid and camphorsulfonic acid), meeting the precise electrical performance requirements of various applications.

Excellent Environmental Stability: Compared with other conductive polymers, polyaniline exhibits excellent thermal and chemical stability in air and at room temperature. Its doped state performance decays slowly, facilitating long-term storage and practical applications.

Powerful Corrosion Resistance and Shielding Effectiveness: Doped polyaniline can form a dense, corrosion-resistant protective layer on metal surfaces and effectively attenuate electromagnetic waves through its conductive network, making it an ideal choice for preparing next-generation lightweight electromagnetic shielding materials.

Solution processing potential: Intrinsic polyaniline is soluble in certain polar solvents (such as N-methylpyrrolidone), which makes it possible to prepare uniform thin films or coatings by spin coating, dip coating or spray coating, which is beneficial for integration into various device processes.

Detailed Application Guide

The functionality of polyaniline (after doping) makes it crucial for applications in several high-tech fields:

Metal Corrosion Protection and Coating: As an anti-corrosion additive, it is used in protective coatings for metals such as ships, bridges, and chemical equipment. Through an electrochemical mechanism, it forms a passivation film, significantly extending the substrate's lifespan.

Antistatic and Electromagnetic Shielding: Used in the preparation of antistatic coatings, plastics, and textiles, as well as flexible electromagnetic shielding composite materials, protecting precision electronic equipment from electrostatic damage and electromagnetic interference.

Energy Storage and Conversion: Leveraging its excellent redox activity and pseudocapacitive properties, it is used to manufacture supercapacitor electrodes, secondary battery electrode materials, and hole transport layers in solar cells.

Chemical and Biosensing: Utilizing its conductivity sensitivity to gases, vapors, pH values, or specific biomolecules, it is used to develop highly sensitive chemical and biosensors.

Electronic Devices: Applications include flexible electronics such as electrochromic smart windows, field-effect transistors, and organic light-emitting diodes.

Quality Control and Support Documentation

We ensure the performance consistency of each batch of polyaniline products and provide complete quality and safety documentation to support your R&D and production, including Material Safety Data Sheets, detailed technical data sheets, and analytical certificates specifying key parameters.

Frequently Asked Questions

What is the difference between the "intrinsic state" and the "doped state" of polyaniline?

Intrinsic polyaniline (emerald green imine basic form) is the untreated ground state with very low electrical conductivity (insulator). By doping with a protic acid (such as hydrochloric acid or p-toluenesulfonic acid), its molecular chains undergo protonation and charge delocalization, transforming it into a high-conductivity doped state (emerald green imine salt form), typically changing its color to dark green. This doping process is reversible and is central to its versatility.

How is polyaniline powder processed into thin films or coatings?

There are generally two main methods: 1) Solution processing: Intrinsic polyaniline is dissolved in a suitable polar solvent (such as N-methylpyrrolidone) to form a solution, which is then spin-coated, drop-cast, or sprayed. After film formation, acid doping is performed. 2) In-situ polymerization: The substrate is immersed in a reaction solution containing aniline monomers, an oxidant, and a dopant acid, allowing polyaniline to polymerize directly on the substrate surface to grow into a film.

What precautions should be taken when storing polyaniline? Polyaniline is relatively stable to air and moisture, but it is still recommended to store it in a cool, dry, and dark environment in a sealed container. Prolonged exposure to strong light or high temperatures may cause slow changes in its properties. Intrinsic products are relatively more stable, while doped products are more sensitive to humidity. Use as soon as possible after opening; any unused portion should be tightly sealed.