Developing new high-performance and recyclable materials

Existing high-sensitivity sensors have been limited by performance degradation due to fatigue and repeated use. However, the dynamic polymer network developed by the research team maintains excellent sensitivity and durability by using vinylogous urethane bonding. This bonding structure self-heals in response to external stimuli such as temperature, light, and pressure, preventing performance degradation even after repeated use.

The dynamic polymer network is also sensitive to various mechanical movements, heat, and light, and sensors based on the network excel at detecting human body movements. Researchers have demonstrated that the sensors can accurately detect finger bends, changes in facial expressions, and even swallowing movements in the throat. One of the biggest strengths of the technology is that it can maintain the same sensitivity after recycling without any degradation.

Addressing the growing issue of e-waste, the team designed the technology to combine recyclability with high performance. They believe the dynamic polymer network's versatility supports repeated use and recycling, potentially leading to significant reductions in e-waste. Their work promises to have far-reaching implications not only in sensor technology but also in next-generation electronics, wearable devices, and medical equipment. The team continues to work on commercializing the technology for widespread industrial applications.

"Our material offers excellent processability and can be recycled mechanically or chemically," said DGIST Professor Chiyoung Park. "The polymer network undergoes a simple recycling process, which we expect will extend the lifespan of electronic devices and wearable sensors, significantly reducing electronic waste."

The research received support from the Industrial Technology Alchemist Project, funded by the Ministry of Trade, Industry and Energy, and the Basic Research Center Project of the Ministry of Science and ICT. The findings (first author: Gyeonghyeon Choi, integrated MS/PhD student) were published in the Chemical Engineering Journal.