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Synthesis of PDMS Chain Structure with Introduced Dynamic Covalent Bonding for High-Performance Rehealable Tactile

My Thi Ngoc Nguyen¹, Trong Danh Nguyen¹, Jae-Hee Han¹

¹Department of Materials Science and Engineering, Gachon University, 1342 Seongnam-Daero, Sujeong-Gu, Seongnam-Si, Gyeonggi-Do, 13120, Republic of Korea.

|May 9, 2024

Summary

This study developed a self-healing polymer for wearable tactile sensors. The material enhances sensitivity and durability, restoring 95% of its function after damage.

Keywords:

PDMS dielectric constant dynamic covalent bonding rehealable tactile sensor

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Area of Science:

Materials Science
Polymer Chemistry
Sensor Technology

Background:

Wearable sensing systems require improved performance and longevity.
Enhancing sensitivity and self-healing capabilities are crucial for advanced devices.

Purpose of the Study:

To synthesize a novel healable dielectric material for capacitive tactile sensors.
To improve the sensitivity, capacitance, and durability of wearable sensors.

Main Methods:

Synthesized a polydimethylsiloxane network (PDMS-SS) with disulfide bonds and ionic salts.
Incorporated pentaerythritol tetrakis 3-mercaptopropionate (PTKPM) as a cross-linking agent.
Added dioctyl sulfosuccinate sodium salt (DOSS) to enhance electrical properties.

Main Results:

The PDMS-SS material demonstrated high sensitivity (0.175 kPa⁻¹) over a wide pressure range (0.1-10 kPa).
The tactile sensor maintained sensitivity after 10,000 pressure cycles.
The material exhibited self-healing properties, restoring approximately 95% of its detection capacity.

Conclusions:

The developed healable polymer is a promising dielectric layer for robust and long-lasting capacitive tactile sensors.
The combination of dynamic disulfide bonds and ionic salts offers a pathway to advanced wearable sensing technologies.
The material's self-healing and high sensitivity address key limitations in current wearable sensor technology.