A Protein-Like Nanogel for Spinning Hierarchically Structured Artificial Spider Silk

Area of Science:

• Biomaterials science
• Polymer chemistry
• Materials engineering

Background:

• Spider dragline silk possesses exceptional strength and toughness due to its hierarchical structure.
• This structure includes β-sheet crosslinking, spiral nanoassemblies, and a sheath-core morphology.
• Replicating these features is key to developing high-performance synthetic fibers.

Purpose of the Study:

• To develop a synthetic fiber inspired by spider dragline silk.
• To mimic the hierarchical structure and spinning process of natural spider silk.
• To achieve high mechanical properties in a synthetically spun fiber.

Main Methods:

• Preparation of a soluble, crosslinked nanogel.
• Draw spinning of the nanogel into fibers with hierarchical structures.
• Incorporation of nucleation seeds, prestretch, and spiral architecture.
• Theoretical modeling of fiber spinning capacity.

Main Results:

• Successfully spun fibers with spider-silk-like hierarchical structures (cross-links, aligned nanoassemblies, sheath-core).
• Achieved breaking strength of 1.27 GPa and toughness of 383 MJ m⁻³.
• Demonstrated tuning of polymer chain alignment and assembly through process parameters.
• Provided theoretical insights into nanogel size dependence on spinning capacity.

Conclusions:

• A novel strategy for direct spinning of tough fiber materials was established.
• The synthetic fibers approach the mechanical properties of natural dragline silk.
• This research opens avenues for creating advanced, high-performance biomimetic fibers.