Dual-Sensing Piezoresponsive Foam for Dynamic and Static Loading.

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Polymeric foams with conductive nano-particles show quasi-piezoelectric (QPE) properties, enabling impact and vibration sensing.
• Existing applications include sports padding and vibration-isolating pads.
• Detailed characterization of QPE behavior and exploration of quasi-static sensing are lacking.

Purpose of the Study:

• To characterize the voltage response of self-sensing foams versus deformation frequency.
• To quantify the correlation between temperature and voltage response.
• To investigate the potential for sensing quasi-static deformation and characterize piezoresistive properties.

Main Methods:

• Characterization of voltage response as a function of deformation frequency.
• Quantification of the relationship between temperature and voltage output.
• Measurement of piezoresistive characteristics in both in-plane and through-thickness configurations.

Main Results:

• Detailed voltage response versus frequency data for QPE behavior was obtained.
• Temperature dependency of the voltage response was quantified.
• A novel piezoresistive response to quasi-static deformation was identified and characterized.

Conclusions:

• The study provides comprehensive characterization of quasi-piezoelectric sensing in conductive polymeric foams.
• The discovery of piezoresistive sensing in response to quasi-static deformation significantly broadens application potential.
• Potential applications include smart insoles for ground reaction force analysis and pressure-sensing seat cushioning.