Bio-Inspired Topologically Constrained, Interlocking-like Cellulose Architectures via Sacrificial Oligomer Templating

Area of Science:

• Materials Science
• Biomaterials Engineering
• Polymer Science

Background:

• The strength-toughness trade-off is a major limitation in developing high-performance bioinspired structural materials.
• Existing materials often compromise toughness for strength or vice versa, hindering broader applications.

Purpose of the Study:

• To engineer a novel cellulose-based material with enhanced strength and toughness.
• To explore a new templating and cross-linking strategy for creating advanced bioinspired materials.

Main Methods:

• Development of topologically interlocking-like cellulose (TICell) using sacrificial oligomer templating with calcium phosphate oligomeric clusters (CPOs).
• Utilized citric acid treatment for template removal and simultaneous covalent cross-linking of cellulose.
• Employed multiscale characterization to analyze the material's nanoscale architecture and mechanical properties.

Main Results:

• TICell exhibits a unique, continuous, percolated network of puzzle-like interlocking modules at the nanoscale.
• The interlocked topology effectively suppresses crack propagation and promotes progressive energy dissipation.
• Achieved a strength of 226 MPa and a fracture toughness of 7.0 kJ m⁻², significantly outperforming natural and synthetic polymers.

Conclusions:

• The developed TICell material offers a sustainable route to damage-tolerant, biobased structural materials.
• Mechanical performance can be primarily governed by topological design rather than solely by composition or crystallinity.
• This approach provides a promising strategy for creating next-generation structural materials with exceptional mechanical resilience.