3D Printable Self-HealingResin Based on Nitrogen-CoordinatedDynamic Boronate Ester Bonds for Flexible Strain Sensors

作者：Henghua Jian, Sirui Chen, J Chen, J ZHU, Zhuo Liu, Xiaofang Liang, Wenyan He, Lixin Wu, Ai‐Zheng Chen, Shi‐Bin Wang, Yuewei Li · 发表于：ACS Applied Polymer Materials · 年份：2026 · DOI：10.1021/acsapm.6c01722 · 研究领域：Polymer composites and self-healing、Advanced Sensor and Energy Harvesting Materials、Advanced Materials and Mechanics

Abstract 3D-printed flexible strain sensors are promising candidates for wearable electronics, biomedical devices, and smart systems. However, prolonged mechanical use often induces damage and reduces service life, highlighting the urgent need for self-healing materials. Traditional boronate ester-based dynamic covalent networks provide self-repair capability but suffer from hydrolytic instability, limiting their application in durable photocurable 3D printing resins. In this study, we report a flexible photocurable resin system incorporating nitrogen-coordinated boronate ester groups and tunable soft segment structures, enabling digital light processing 3D printing of high-performance self-healing sensors. The optimized resin exhibits balanced printability, considerable mechanical properties, alongside efficient self-healing performance with recovery rates up to 99.7% after fracture. The material maintains structural integrity and functional stability under repeated tensile strains of 200% and compressive strains of 30%. Porous sensor architectures fabricated via DLP printing achieve high sensitivity with a gauge factor up to 1.97 and ultrafast response times of 40–60 ms, allowing accurate monitoring of diverse human motions, from subtle throat and finger movements to complex knee and gait dynamics. Furthermore, the nitrogen-coordinated dynamic network confers improved hydrolytic and thermal stability, while shape memory behavior enables reversible deformation and real-time ...