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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

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Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

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Aqueous Electrolyte Compatible Electrochromic Polymers Processed from an Environmentally Sustainable Solvent.

Graham S Collier¹, Ian Pelse¹, John R Reynolds¹

¹School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

ACS Macro Letters

|June 2, 2022

Summary

Researchers developed a new redox-active polymer for aqueous electrolytes. This polymer is processed from sustainable solvents, offering a greener alternative for electronic devices.

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Area of Science:

Materials Science
Polymer Chemistry
Electrochemistry

Background:

Developing aqueous electrolyte-compatible, redox-active polymers processed from sustainable solvents is crucial for reducing environmental impact and health hazards.
Traditional poly(3,4-propylenedioxythiophenes) often require organic solvents for processing, limiting their environmental sustainability.

Purpose of the Study:

To synthesize a poly(3,4-propylenedioxythiophene) derivative with enhanced aqueous electrolyte compatibility and processability from green solvents.
To investigate the electrochromic properties of the novel polymer in aqueous electrolytes.

Main Methods:

Synthesis of a poly(3,4-propylenedioxythiophene) with four ester functionalities via direct arylation polymerization.
Spray-casting of the polymer into thin films using 2-methyltetrahydrofuran, an environmentally sustainable solvent.
Electrochemical characterization in 0.1 M NaCl aqueous electrolyte to assess redox behavior and electrochromism.

Main Results:

The multiester-functionalized polymer demonstrated solubility in sustainable organic solvents and compatibility with aqueous electrolytes.
The polymer exhibited electrochromic behavior, transitioning from a colored neutral state to a colorless oxidized state at a low oxidation onset (∼0.4 V vs Ag/AgCl).
Achieved contrast values of ∼70% and switching speeds of ∼2 s in aqueous electrolytes, comparable to traditional polymers in organic electrolytes.

Conclusions:

Multipolar ester functionalities are an effective design strategy for creating redox-active polymers that are processable from organic solvents and compatible with aqueous electrolytes.
This approach enables the development of sustainable electrochromic materials without compromising performance or requiring post-polymerization modifications.