Mechanical properties of cross-linked synthetic elastomeric polypentapeptides

Jonghwi Lee, Christopher W. Macosko, Dan W. Urry

Research output: Contribution to journalArticlepeer-review

86 Scopus citations


Mechanical properties in equilibrium swelling states were examined for two elastomeric polypentapeptides, namely, (GVGVP)251 and (GVGIP)260 where G = glycine, V = valine, P = proline, and I = isoleucine. They had been prepared using recombinant DNA technology and cross-linked by γ-irradiation over the range of doses from 6 to 30 Mrad. Moduli were measured in uniaxial tensile tests. The specific work of fracture was determined as a measure of toughness. Increased doses of γ-radiation increased the moduli (cross-link density) of hydrogels. The hydrophobic folding and assembly phase transition that occurred on raising the temperature was demonstrated to have significant effects on moduli and fracture properties. Thermoelasticity experiments suggest that the phase transition involves changes in elasticity mechanism. Above the transition temperature, hydrogels were shown to become more viscoelastic.

Original languageEnglish (US)
Pages (from-to)5968-5974
Number of pages7
Issue number17
StatePublished - Aug 14 2001

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