Repeatable Self-Healing of a Protective Coating Based on Vegetable-Oil-Loaded Microcapsules

Area of Science:

• Materials Science
• Polymer Chemistry
• Corrosion Science

Background:

• Microcapsule-based self-healing materials typically offer only single-event local repair.
• Developing multi-cycle self-healing materials with simple preparation and efficient operation remains a challenge.

Purpose of the Study:

• To develop a repeatable, multi-cycle self-healing coating using a dual-capsule system with vegetable oils.
• To investigate the atmospheric oxygen-induced reaction of soybean and olive oil mixtures as healing agents.
• To optimize the healing agent composition for enhanced performance.

Main Methods:

• Preparation of microcapsules containing soybean oil and catalyst-laden olive oil.
• Formulation of a dual-capsule self-healing coating.
• Characterization using optical microscopy, scanning electron microscopy (SEM), infrared spectroscopy, recovery testing, and viscoelasticity measurement.
• Evaluation of anticorrosion and electrochemical properties.

Main Results:

• Successful fabrication of a dual-capsule self-healing coating using a soybean and olive oil mixture.
• Demonstration of repeatable self-healing upon re-scribing, confirmed by microscopy and testing.
• Identification of an optimal healing agent composition through various analyses.
• The coating exhibited efficient healing without external stimuli like light.

Conclusions:

• A novel, environmentally friendly, and repeatable self-healing coating was successfully developed.
• The dual-capsule system utilizing vegetable oils offers an efficient and easily prepared alternative to conventional self-healing materials.
• This approach overcomes the single-healing limitation and eliminates the need for external intervention, paving the way for advanced protective coatings.