Self-healing capability of novel eco-epoxy adhesives based on the modified tannic acid on Al adherends tested in a single lap joint

The aim of this paper is to study the self-healing capability fractured Al joints bonded with novel eco-epoxide adhesives synthesized from a bio-renewable raw material (tannic acid – TA). Two eco-epoxy components based on TA, (A) glycidyl ether and (B) phosphate ester were used as replacement for toxic epoxy component Bisphenol A. effect was measured recovery shear strength in single lap joint (SLJ) test after complete failure, which compared reference (R). procedure performed an autoclave at 180 °C 2 h bars. A combination two monitoring techniques, Digital Image Correlation (DIC) Acoustic Emission (AE), monitor strain distribution damage propagation SLJ. stress B SLJ had values range 2.3–5.1 MPa. fracture analysis showed adhesive failure all tested adhesives, not affected by process. Out only demonstrated heal. higher than 50% virgin case. In addition, AE managed capture clear distinction between signals self-healed tests Results obtained highlighted promising potential using bio-based structural bonding possibility such joints.