Astretchable printed circuit board (PCB), which is an essential component of next-generation electronic devices, should be highly stretchable even at high levels of integration, as well as durable under repetitive stretching and patternable. Herein, an island-structured stretchable PCB composed of materials with controlled Young's modulus and viscosity by adding a reinforcing agent or controlling the degree of crosslinking is reported. Each material was fabricated with the most effective structures through a 3D printer. The PCB was able to stretch 71.3% even when highly integrated and was patterned so that various components could be mounted. When fully integrated, the stress applied to the mounted components was reduced by 99.9% even when stretched by over 70%. Consequently, a 4 x 4 array of capacitance sensors in a stretchable keypad demonstration using our PCB was shown to work, even at 50% stretching of the PCB.
Bibliographical noteFunding Information:
Funding: This research was performed as part of project No. SS2021-10 (Development of material and integrated device application technology for untethered IoT devices) and supported by the Korea Research Institute of Chemical Technology (KRICT) and the Global Research Laboratory Program of the National Research Foundation (NRF) funded by the Ministry of Science, Information and Communication Technologies and Future Planning (NRF-2015K1A1A2029679).
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Mechanical Engineering
- Electrical and Electronic Engineering