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Selective Laser Sintering of Polydimethylsiloxane Composites
Jinzhi Wang1, Shaojie Sun1, Xue Li1
1State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, China.
3D Printing and Additive Manufacturing
|August 23, 2023
Summary
This study introduces self-healing, conductive silicone elastomer nanocomposites for electronic skin and sensors. These materials, made using 3D printing, offer high conductivity and crack detection capabilities.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Conductive silicone elastomers are crucial for applications like electronic skin and wearable devices.
- Developing materials with enhanced conductivity, self-healing, and sensing capabilities remains a significant challenge.
Purpose of the Study:
- To develop a novel conductive silicone elastomer composite with self-healing properties for advanced electronic applications.
- To investigate the potential of using selective laser sintering (SLS) for 3D printing these nanocomposites.
- To evaluate the material's performance in strain sensing and crack detection.
Main Methods:
- Fabrication of polydimethylsiloxane-based covalent adaptable networks (PDMS-CANs) with dynamic pyrazole urea bonds.
- Preparation of carbon nanotubes (CNTs) wrapped PDMS-CANs (CNTs@PDMS-CANs) powders via liquid phase adsorption and deposition.
- Utilizing selective laser sintering (SLS) for 3D printing of the CNTs@PDMS-CANs nanocomposites.
- Characterization of electrical conductivity, self-healing, crack detection via infrared thermography, and strain sensing performance.
Main Results:
- SLS-printed PDMS-CANs/CNTs nanocomposites exhibited high electrical conductivity and a low percolation threshold.
- The dynamic pyrazole urea bonds enabled self-healing under electrothermal and photothermal stimuli.
- Crack diagnosing was achieved by monitoring resistance differences using infrared thermography under electrical load.
- The composite demonstrated reliable cyclic electrical resistance changes when used as a strain sensor under compression and bending.
Conclusions:
- The developed CNTs@PDMS-CANs nanocomposites are suitable for 3D printing using SLS, yielding materials with excellent conductivity and self-healing properties.
- The material shows promise for applications requiring integrated sensing, self-repair, and damage detection, such as in advanced wearable electronics and electronic skin.
- The study highlights a novel approach to creating functional nanocomposites for next-generation electronic devices.
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