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Ultrastretchable Iono-Elastomers with Mechanoelectrical Response.

Carlos R López-Barrón¹, Ru Chen², Norman J Wagner²

¹ExxonMobil Chemical Company, Baytown Technology and Engineering Complex, Baytown, Texas 77520, United States.

ACS Macro Letters

|June 2, 2022

Summary

This summary is machine-generated.

Researchers developed novel iono-elastomers for wearable electronics. These materials show high stretchability and conductivity, with conductivity increasing reversibly under strain due to unique microstructural changes.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Wearable electronics demand advanced materials with superior stretchability, load resistance, and conductivity.
Existing materials often compromise on one or more of these critical properties.

Purpose of the Study:

To develop a facile synthetic strategy for novel elastomeric ion gels (iono-elastomers).
To investigate the unique mechanoelectrical response and microstructural properties of these new materials.

Main Methods:

Self-assembly of end-functionalized triblock copolymer (PEO106-PPO70-PEO106) in ethylammonium nitrate.
Micelle corona cross-linking to form iono-elastomers.
In situ small-angle X-ray scattering (SAXS) to analyze structural transformations during deformation.

Main Results:

Achieved high stretchability, ionic conductivity, and a reversible mechanoelectrical response.
Observed a significant, counterintuitive increase in ion conductivity with applied strain during uniaxial extension.
Demonstrated reversible crystal structure transformations correlating with conductivity changes.

Conclusions:

The novel iono-elastomers offer a promising combination of properties for advanced wearable electronic applications.
The observed mechanoelectrical response is attributed to reversible ion nanochannel formation via microstructural rearrangement.
This work presents a new class of materials with tunable conductivity under mechanical load.