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Molecularly Shielded, On-Demand, Ultrasound-Cured Polymer Networks.

Adrian A Lorenzana¹, Hsu Shwe Yee Naing¹, Jichao Song¹

¹Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States.

|July 2, 2025

Summary

Researchers developed ultrasound-sensitive polymers that transition from liquid to solid on demand. This innovation offers precise control over gelation for applications sensitive to heat or light.

Keywords:

Epoxide methacrylates poly(ethylene glycol)

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Assembly and Characterization of Polyelectrolyte Complex Micelles

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Published on: March 2, 2020

Area of Science:

Polymer Chemistry
Materials Science
Biomaterials Engineering

Background:

Polymer networks are versatile materials used in applications ranging from hydrogels to adhesives.
Traditional crosslinking methods involve heat or high-energy light, limiting their use in sensitive applications.
Mechanical force is a newer method for inducing crosslinks in pre-existing polymer networks.

Purpose of the Study:

To develop a novel strategy for inducing liquid-to-solid crosslinking using mechanical deformation and ultrasound.
To synthesize and characterize graft copolymers with ultrasound-responsive crosslinking capabilities.
To demonstrate the rapid gelation of polymer solutions upon ultrasound application.

Main Methods:

Synthesis of graft copolymers featuring poly(ethylene glycol) (PEG) side-chains to shield reactive epoxide groups.
Formulation of polymer solutions that remain liquid under undisturbed conditions.
Application of ultrasound to initiate rapid gelation (liquid-to-solid transition).

Main Results:

Ultrasound-sensitive polymers were successfully synthesized with protected epoxide groups.
Polymer solutions remained stable as liquids until exposed to ultrasound.
Gelation was initiated within 20 seconds of ultrasound application.
The developed polymers are suitable for light- and heat-sensitive applications.

Conclusions:

A new method for controlled polymer network formation using ultrasound has been established.
Ultrasound-induced gelation provides precise control over crosslinking timing.
These materials offer a promising alternative for applications requiring specific gelation triggers.
The shielding strategy effectively protects reactive groups until ultrasound activation.