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Updated: Jul 8, 2025

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

Soft glassy materials with tunable extensibility.

Samya Sen¹, Rubens R Fernandes¹, Randy H Ewoldt¹

¹Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA. ewoldt@illinois.edu.

|December 11, 2023

Summary

This summary is machine-generated.

This study introduces a new model material combining soft glassy microgels and polymers to create highly extensible yield-stress fluids. Researchers achieved orthogonal control over shear and extensional properties, opening new application possibilities.

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Area of Science:

Soft Matter Physics
Materials Science
Rheology

Background:

Classical soft glassy materials and yield-stress fluids typically lack significant extensibility.
Recent advances involve adding polymeric phases to viscoplastic dispersions to enhance extensibility.
Fundamental understanding of coupled shear and extensional rheology in these systems remains limited.

Purpose of the Study:

To design and characterize a model yield-stress fluid with tunable extensibility.
To establish criteria for the design and rheological assessment of such materials.
To investigate the coupling between shear and extensional properties.

Main Methods:

Formulation of a model material: a mixture of soft glassy microgels and high molecular weight linear polymer solutions.
Systematic rheological characterization in both shear and extensional flow.
Analysis of the relationship between material design and rheological behavior.

Main Results:

Demonstration of a model system with significant extensibility.
Establishment of design criteria for controlling shear and extensional rheology.
Achieved orthogonal modulation: dramatic changes in extensional behavior with minimal impact on shear yield stress and elastic modulus.

Conclusions:

The proposed model material allows for independent tuning of shear and extensional properties.
This decoupling enables novel applications leveraging orthogonal control of material behavior.
The findings provide a pathway for designing advanced soft glassy materials with tailored rheological responses.