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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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Related Experiment Video

Updated: May 5, 2026

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

Published on: April 16, 2018

Additive-Free Ionic Polyurethanes with Ultrasensitive Thermo-Switchable Conductivity and Melting Stability.

Haiming Chen^1,2, Xiaoxi Li^1,2, Kai Lu^3,4

¹Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China.

Advanced Materials (Deerfield Beach, Fla.)

|February 26, 2026

Summary

This summary is machine-generated.

New thermally switchable ion-conductive polymers (TSIPs) overcome limitations like ion leaching. These polymers offer precise conductivity control and dual mechanisms for ion transport, enabling advanced flexible electronics and anti-counterfeiting applications.

Keywords:

additive‐free fluorescence ionic polyurethane temperature‐switchable conductivity

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Area of Science:

Materials Science
Polymer Chemistry
Condensed Matter Physics

Background:

Thermally switchable ion-conductive polymers (TSIPs) are promising for flexible electronics and information encryption.
Existing TSIPs face challenges including ion leaching, interfacial instability, and poor temperature sensitivity.

Purpose of the Study:

To develop novel ionic polyurethanes with enhanced temperature-switchable conductivity and reduced limitations.
To investigate the ion transport mechanisms and material properties for advanced applications.

Main Methods:

Synthesized ionic polyurethanes with covalently grafted ionic groups.
Characterized thermo-electrical response and temperature coefficient of conductivity.
Employed modeling of electrode polarization to elucidate ion transport mechanisms.
Evaluated photoluminescence and optical transition properties.

Main Results:

Achieved ultra-sensitive thermo-electrical response with a record-high temperature coefficient of conductivity (30.2%°C^-¹).
Identified a dual ion transport mechanism involving segmental motion and ionic cluster reconstruction.
Demonstrated stable photoluminescence and reversible opaque-to-transparent transitions.
Confirmed mechanical integrity in the melt state due to dynamic reorganization of ionic clusters.

Conclusions:

The developed ionic polyurethanes offer a versatile platform for flexible electronics and multimodal anti-counterfeiting.
Covalent grafting of ionic groups and control over soft segment length enable precise conductivity switching.
The materials exhibit unique properties for advanced applications requiring thermal responsiveness and security features.