Design Principles of Interfacial Dynamic Bonds in Self-Healing Materials: What are the Parameters?

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Polymers and polymer nanocomposites (PNCs) are widely used but face environmental challenges due to permanent damage.
• Developing self-healing materials is crucial for extending product lifespan and improving safety.

Purpose of the Study:

• To review recent advancements in self-healing materials, focusing on self-healing PNCs (SH-PNCs).
• To provide insights into fabricating SH-PNCs that achieve a balance between mechanical strength and self-healing capability.

Main Methods:

• Reviewing literature on self-healing materials and PNCs.
• Analyzing the role of nanoparticles and supramolecular networks in SH-PNCs.
• Investigating molecular parameters influencing mechanical strength and self-healing.

Main Results:

• Nanoparticles can enhance mechanical strength but may impair self-healing if not integrated with the supramolecular network.
• Combining covalent bonds and non-covalent interactions is key to optimal SH-PNC performance.
• Specific entropic, enthalpic changes, and polymer chain dynamics are vital for surface reconstruction and bond reshuffling.

Conclusions:

• Achieving robust mechanical strength alongside effective self-healing in SH-PNCs is a significant challenge.
• Tailoring molecular parameters is essential for designing advanced SH-PNCs with superior performance.
• This review highlights strategies for fabricating high-performance SH-PNCs.