Engineering tough, energy-dissipating soft materials via sacrificial chemical bonds

Area of Science:

• Materials Science
• Biomaterials Engineering
• Polymer Chemistry

Background:

• High-performance materials like Kevlar offer impact resistance but sacrifice flexibility and processability due to rigid structures.
• Nature provides models for soft, load-resisting materials, such as the sea cucumber's adaptable skin, which uses transient non-covalent interactions in collagen fibers.
• These biological mechanisms involve sacrificial bonds that dissipate energy without fiber damage, a principle explored in synthetic materials.

Purpose of the Study:

• To review recent (post-2017) advancements in energy-dissipating soft materials.
• To organize these developments based on the chemical nature of sacrificial bonds.
• To outline the available chemical strategies for designing material properties.

Main Methods:

• Survey of recent primary literature (post-2017) on energy-dissipating soft materials.
• Classification of materials based on the chemical characteristics of their sacrificial bonds.
• Analysis of synthetic approaches mimicking biological energy dissipation mechanisms.

Main Results:

• Identification of diverse chemical motifs enabling sacrificial bonding in synthetic soft materials.
• Demonstration of recent progress in creating materials that combine softness with toughness.
• Compilation of a chemical toolkit for programming material properties through sacrificial bonds.

Conclusions:

• Sacrificial bonds offer a promising route to developing soft yet tough energy-dissipating materials.
• Further research can advance the design and application of these biomimetic materials.
• Harnessing sacrificial bond mechanisms is key to future innovations in material science.