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Related Experiment Video

Updated: May 8, 2026

Fabrication and Design of Wood-Based High-Performance Composites

Fabrication and Design of Wood-Based High-Performance Composites

Published on: November 9, 2019

High performance composites with active stiffness control.

Charnwit Tridech¹, Henry A Maples, Paul Robinson

¹Polymer & Composite Engineering (PaCE) Group, Department of Chemical Engineering, Imperial College London , South Kensington Campus, London, SW7 2AZ, UK.

ACS Applied Materials & Interfaces

|August 28, 2013

Summary

This summary is machine-generated.

Researchers developed a novel carbon fiber composite with actively controllable stiffness. This material can significantly reduce its stiffness when heated and fully recover, enabling new applications in morphing structures.

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Reconstituting and Characterizing Actin-Microtubule Composites with Tunable Motor-Driven Dynamics and Mechanics

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Area of Science:

Materials Science
Composite Materials Engineering

Background:

Carbon fiber reinforced composites offer high performance but lack tunable mechanical properties.
Controllable stiffness in composites could enable advanced applications like morphing aircraft wings and deployable structures.

Purpose of the Study:

To develop and demonstrate a carbon fiber composite material with actively controllable stiffness.
To investigate the mechanism of stiffness reduction and recovery in the developed composite.

Main Methods:

Electrocoating carbon fibers with a polyacrylamide (PAAm) layer.
Embedding PAAm-coated fibers into an epoxy matrix using resin infusion.
Utilizing the carbon fibers as resistance heating elements to trigger stiffness changes.

Main Results:

Achieved an 88% reduction in flexural stiffness at elevated temperatures.
Demonstrated full recovery of stiffness upon cooling with no discernible damage or property loss.
Showcased tunable softening temperatures by adjusting the moisture content of the PAAm coating.

Conclusions:

A novel structural material with on-demand controllable stiffness was successfully developed.
The material's stiffness can be reversibly tuned by heating/cooling the PAAm interphase.
This technology holds significant potential for advanced structural applications requiring adaptive mechanical properties.