Brush-like Polyaniline with Optical and Electroactive Properties at Neutral pH and High Temperature

Area of Science:

• Polymer Chemistry
• Materials Science
• Conducting Polymers

Background:

• Conventional polyaniline (PAni) suffers from poor processability and dedoping issues above pH 4.
• Developing processable conducting polymers with enhanced stability is crucial for advanced applications.

Purpose of the Study:

• To synthesize a brush-like polyaniline (BL PAni) with improved processability and pH stability.
• To investigate the structural, thermal, optical, and electrochemical properties of the novel BL PAni.

Main Methods:

• Synthesis of BL PAni using RAFT polymerization, RAFT-mediated surfactant-free emulsion polymerization, and interfacial oxidative polymerization.
• Characterization using NMR, FT-IR, TGA, DSC, UV-Vis spectroscopy, and cyclic voltammetry.

Main Results:

• BL PAni demonstrated enhanced processability and dedoping resistance up to 80 °C and neutral pH.
• UV-Vis spectroscopy revealed broad absorption into the near-infrared, attributed to π-stacking interactions.
• Cyclic voltammetry confirmed sustained electroactivity near pH 7.

Conclusions:

• The developed BL PAni strategy effectively overcomes limitations of conventional polyaniline.
• The brush-like architecture and π-stacking contribute to improved stability and optical properties.
• BL PAni shows potential for applications requiring stable conducting polymers in neutral environments.