A Biodegradable Radical Polymer Enables High‐Performance, Physically Transient Organic Memory

Abstract Electronic devices often demand high reliability and longevity, but they also contribute significantly to electronic waste. Physically transient electronics have thus emerged as a promising alternative in future electronics, particularly in wearable and implantable bioelectronics. In these applications, memristive materials have gained significant attention for their potential to realize neuromorphic systems that offer energy‐efficient, hardware‐based parallel processing. By integrating memristive capabilities with transient behavior, this study bridges these two cutting‐edge fields, creating materials that not only enable advanced computing but also dissociate sustainably. Additionally, we leverage the unique features of soft materials for their tunability, biocompatibility, and cost‐effectiveness, which collectively enhance this integration. In this work, we first illustrate molecular engineering strategy on a radical polymer. We then proceed to two‐terminal devices therefrom, which exhibit exceptional memory performance of >10 6 on/off ratio, >10 4 s state retention, and stability over 250 DC sweep cycles. A flexible, optically transparent, and physically transient crossbar arrays are also developed, which maintain the performance through >3,000 bending cycles and fully dissociate in water at room temperature. This work represents an advancement toward a biorealistic platform with substantial multifunctionality, making it readily translatable to future wearable and implantable neuromorphic devices.