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In this work, a new class of highly stretchable peptide-polyurethane/ureas (PUUs) were synthesized containing short β -sheet forming peptide blocks of poly( γ -benzyl-l-glutamate)- b -poly(propylene glycol)- b -poly( γ -benzyl-l-glutamate) (PBLG- b -PPG- b -PBLG), isophorone diisocyanate as the hard segment, and polytetramethylene ether glycol as the soft phase. PBLG- b -PPG- b -PBLG with short peptide segment length (&lt;10 residues) was synthesized by amine-initiated ring opening polymerization of γ -benzyl-l-glutamate- N -carboxyanhydrides (BLG-NCA), which shows mixed α-helix and β -sheet conformation, where the percent of β -sheet structure was above 48%. Morphological studies indicate that the obtained PUUs show β -sheet crystal and nanofibrous structure. Mechanical tests reveal the PUUs display medium tensile strength (0.25⁻4.6 MPa), high stretchability (&gt;1600%), human-tissue-compatible Young's modulus (226⁻513 KPa). Furthermore, the shape recovery ratio could reach above 85% during successive cycles at high strain (500%). In this study, we report a facile synthetic method to obtain highly stretchable and recovery peptide-polyurethane/urea materials, which will have various potential applications such as wearable and implantable electronics, and biomedical devices.

Facile Preparation of Highly Stretchable and Recovery Peptide-Polyurethane/Ureas