Redox-Stable and Multicolor Electrochromic Polyamides with Four Triarylamine Cores in the Repeating Unit

Area of Science:

• Materials Science
• Polymer Chemistry
• Electrochemistry

Background:

• Triarylamine derivatives are crucial in developing electroactive polymers.
• Electrochromic polymers offer tunable optical properties for advanced applications.
• Enhancing the stability and performance of electrochromic materials remains a key research challenge.

Purpose of the Study:

• Synthesize novel triarylamine-based diamine monomers.
• Develop electroactive polyamides with enhanced electrochromic properties.
• Investigate the redox and electrochromic stability of the synthesized polymers.

Main Methods:

• Synthesis of two new triarylamine-based diamine monomers via multi-step organic reactions.
• Polycondensation reactions of the synthesized monomers with aromatic dicarboxylic acids to form polyamides.
• Electrochemical characterization, including cyclic voltammetry and electrochromic switching tests.

Main Results:

• Successful synthesis of monomers 3 and 7, leading to two series of electroactive polyamides.
• Polymers exhibited multicolored electrochromism, high optical contrast, and excellent redox stability.
• Achieved remarkable electrochromic stability with only 3-6% decay in coloration efficiency after 14,000 cycles.
• Observed strong near-infrared absorption upon oxidation.

Conclusions:

• Incorporation of multiple triarylamine cores and methoxy groups enhances electrochromic performance and stability.
• The developed polyamides demonstrate superior electrochromic durability compared to existing triarylamine-based polymers.
• These materials hold significant potential for advanced electrochromic devices and near-infrared applications.