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Synthesis of Biocompatible Liquid Crystal Elastomer Foams as Cell Scaffolds for 3D Spatial Cell Cultures

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Published on: April 11, 2017

Soft elasticity optimises dissipation in 3D-printed liquid crystal elastomers.

D Mistry^1,2, N A Traugutt^3,4, B Sanborn⁵

¹Department of Mechanical Engineering, University of Colorado Denver, Denver, CO, 80204, USA. d.a.mistry@leeds.ac.uk.

Nature Communications

|November 19, 2021

Summary

This summary is machine-generated.

Researchers developed 3D printed liquid crystal elastomers (LCEs) for superior impact absorption. These soft-elastic LCEs dissipate significant strain energy, outperforming conventional materials in impact mitigation.

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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

Published on: February 6, 2016

Area of Science:

Materials Science
Polymer Chemistry
Mechanics

Background:

Soft-elasticity in liquid crystal elastomers (LCEs) shows potential for impact absorption.
Synthesizing large monodomain LCEs for compressive studies has been challenging.
Ideal impact absorbers dissipate strain energy at constant stress.

Purpose of the Study:

To fabricate bulk monodomain LCEs using 3D printing for impact studies.
To investigate the compressive soft-elasticity of LCEs across a wide range of strain rates.
To evaluate LCEs as impact absorbers and demonstrate control over their mechanical behavior.

Main Methods:

Direct-ink writing 3D printing to fabricate bulk (>cm³) monodomain LCE devices.
Compressive soft-elasticity testing over 8 decades of strain rate.
Drop testing and analysis of impact severity using the Gadd Severity Index.

Main Results:

Monodomain soft-elastic LCEs dissipated 45% of strain energy at quasi-static rates, significantly more than comparators (<20%).
LCEs performed closest to ideal impact absorbers up to strain rates of 3000 s⁻¹.
Soft-elastic LCEs reduced impact severity by 40% (Gadd Severity Index) compared to isotropic elastomers.
Deformation and buckling behavior were tailored by controlling the printed director orientation.

Conclusions:

3D printed monodomain LCEs are effective impact absorbers due to their soft-elastic properties.
The ability to tailor mechanical response via director orientation opens new design possibilities.
These findings pave the way for advanced impact-mitigating materials.