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Controlled Sol-Gel Transitions by Actuating Molecular Machine Based Supramolecular Polymers.

Antoine Goujon¹, Giacomo Mariani², Thomas Lang¹

¹SAMS research group, University of Strasbourg, Institut Charles Sadron, CNRS, 23 rue du Loess, BP 84047, 67034 Cedex 2 Strasbourg, France.

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Summary

Chemists created smart polymers using molecular muscles. Nanoscale actuation of these artificial muscles triggers a macroscopic sol-gel transition in the bulk material, enabling new smart materials.

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Area of Science:

Polymer Science
Supramolecular Chemistry
Materials Science
Nanotechnology

Background:

Developing smart materials requires linking nanoscale actuation to macroscopic responses.
Artificial molecular machines offer a pathway to create responsive polymer systems.
Supramolecular polymers based on Upy units provide a versatile platform for material design.

Purpose of the Study:

To integrate bistable [c2]daisy chain rotaxanes (molecular muscles) into main-chain supramolecular polymers.
To investigate how nanoscale mechanical actuation influences the macroscopic properties of these polymers.
To demonstrate pH-triggered control over polymer network formation and material phase transitions.

Main Methods:

Synthesis of Upy-based supramolecular polymers incorporating bistable [c2]daisy chain rotaxanes.
Quantitative studies to analyze the influence of pH on rotaxane actuation.
Investigation of the effect of nanoscale actuation on supramolecular Upy unit behavior.
Observation of macroscopic sol-gel transitions as a response to nanoactuation.

Main Results:

Bistable [c2]daisy chain rotaxanes were successfully integrated into main-chain supramolecular polymers.
pH-triggered nanoscale actuation of rotaxanes was shown to alter the supramolecular interactions of Upy units.
This localized nanoactuation induced a controllable macroscopic sol-gel transition in the polymer material.

Conclusions:

Artificial molecular machines can be effectively used to control supramolecular polymer networks.
Nanoscale mechanical actuation within polymers can lead to macroscopic material property changes.
This approach enables the development of novel, mechanically responsive smart materials.