Microencapsulated single-component epoxies for self-healing of glass fiber reinforced polymers subjected to low-velocity impacts

This study aimed to investigate the potential of self-healing single-component epoxy microcapsules for improving the impact resistance and durability of glass fiber-reinforced polymer (GFRP) composites. Microcapsules containing a single-component epoxy resin were synthesized using sodium lauryl sulfate and polyvinyl alcohol as stabilizing agents. The microcapsules were characterized, revealing an average size of 3.056 μm. GFRP composites embedded with 10 wt% of the synthesized microcapsules were prepared. The composites were subjected to low-velocity impacts at velocities of 3 m/s, 3.5 m/s, and 4 m/s. Residual flexural properties were evaluated using three-point bending tests. The impact resistance and self-healing efficiency of the GFRP composites showed significant improvement. The flexural after-impact strength exhibited considerable recovery post-impact. A healing efficiency of 61.1% was observed for specimens impacted at a velocity of 3 m/s. Incorporating microcapsules loaded with healing agents transforms GFRP composites into smart materials. The microcapsules act as microscopic primers, rupturing upon damage and releasing the healing agent to mitigate crack propagation and bolster structural integrity autonomously by extending the service life of the composite. The research provides valuable insights into optimizing the performance and durability of GFRP composites. Potential applications span across aerospace, automotive, and structural engineering domains.