Robust β-Sheet Peptide Reinforced Polymer Fibers

Area of Science:

• Materials Science
• Biomaterials Engineering
• Polymer Chemistry

Background:

• Natural silks, like spider silk, are polypeptide-based nanocomposites.
• High strength and toughness in spider silk are attributed to embedded beta-sheet crystals within an amorphous matrix.
• Mimicking natural silk structures offers a pathway to developing advanced materials with superior mechanical properties.

Purpose of the Study:

• To investigate the incorporation of poly(l-valine) (PVal) beta-sheet nanocrystals into diverse fiber types.
• To explore the potential of biomimetic beta-sheet structures for enhancing material properties.
• To assess the feasibility of implementing PVal beta-sheets into various polymer matrices.

Main Methods:

• Synthesis and characterization of poly(l-valine) beta-sheet nanocrystals.
• Incorporation of PVal beta-sheets into different polymer fibers, including polycaprolactone (PCL), Nylon 6, cellulose, and recombinant spider silk.
• In situ implementation during wet-spinning processes.
• Micro- and nanoscale analysis of the resulting composite fibers.

Main Results:

• Polyvaline beta-sheets were successfully integrated into fibers composed of various polymer classes.
• The implementation of PVal beta-sheets was demonstrated in both standard polymers (PCL, Nylon 6) and biopolymers (cellulose, recombinant spider silk).
• In situ PVal incorporation during wet-spinning significantly altered the mechanical properties of the resultant fibers, with effects varying by polymer type.

Conclusions:

• Polyvaline beta-sheet nanocrystals can be effectively incorporated into a range of polymer fibers.
• This approach provides a viable strategy for creating biomimetic nanocomposite fibers.
• The study highlights the potential for tailoring mechanical properties of fibers through the integration of polypeptide beta-sheet structures.