Rapid, Puncture-Initiated Healing via Oxygen-Mediated Polymerization

Area of Science:

• Materials Science
• Polymer Chemistry
• Mechanical Engineering

Background:

• Autonomous healing materials aim to restore structural integrity after damage.
• Existing self-repair methods often lack speed and efficiency.
• Thiol-ene polymerization offers a rapid, tunable reaction pathway.

Purpose of the Study:

• To demonstrate autonomously healing materials utilizing thiol-ene polymerization initiated by atmospheric oxygen.
• To investigate the rapid polymerization kinetics and sealing capabilities of these materials.
• To provide a novel, fast-acting self-healing solution for material breaches.

Main Methods:

• Fabrication of trilayered panels with thiol-ene-trialkylborane resin formulations.
• Initiation of healing via high-velocity projectile impact, exposing the resin to atmospheric oxygen.
• Characterization using infrared spectroscopy, high-speed video, and thermal imaging.

Main Results:

• Rapid polymerization of resin formulations within seconds of atmospheric oxygen contact.
• Demonstrated sealing of breaches through liquid-to-solid transition.
• Confirmation of immediate polymerization initiation via exotherm and viscosity increase.

Conclusions:

• The developed materials exhibit rapid autonomous healing capabilities, sealing breaches in seconds.
• Atmospheric oxygen effectively initiates thiol-ene polymerization for swift material repair.
• This approach represents a significant advancement in fast-acting self-healing materials.