Dual Dynamic Network Cross-Linked Recyclable, Self-Healing Biobased Elastomer with Electromagnetic Shielding and Photothermal Conversion Properties

The incorporation of biobased materials into elastomers represents a critical approach to mitigating carbon emissions and combating environmental degradation. Epoxy natural rubber (ENR), Curdlan(CD), and other bioderived polymers have attracted considerable attention for their potential in developing self-healing and recyclable elastomeric composites. In this study, a novel biobased elastomer integrating dynamic boroxine bonds and β-hydroxy-ester networks was synthesized through the reaction between the epoxy groups of ENR, the amino groups of 3-aminophenylboronic acid (APBA), and the carboxyl groups of tartaric acid (TA). The resulting material exhibited exceptional mechanical properties, including a tensile strength of 9.07 MPa, and achieved an 84.4% self-healing efficiency within 1 h. Notably, the elastomer demonstrated a peak electromagnetic interference shielding effectiveness of 39.72 dB in the X-band (8.2–12.4 GHz), coupled with shape memory functionality and photothermal conversion capabilities (absorbing ∼95% of visible-near-infrared light). These multifunctional characteristics position the material as a promising candidate for next-generation biobased electronic shielding components, particularly in the emerging field of sustainable materials for smart devices.