Mechanical Properties of Cross-Linked Synthetic Elastomeric Polypentapeptides
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- 作者：Jonghwi Lee ; Christopher W. Macosko ; and Dan W. Urry
- 刊名：Macromolecules
- 出版年：2001
- 出版时间：August 14, 2001
- 年：2001
- 卷：34
- 期：17
- 页码：5968 - 5974
- 全文大小：84K
- 年卷期：v.34,no.17(August 14, 2001)
- ISSN：1520-5835
文摘
Mechanical properties in equilibrium swelling states were examined for two elastomericpolypentapeptides, namely, (GVGVP)251 and (GVGIP)260 where G = glycine, V = valine, P = proline, andI = isoleucine. They had been prepared using recombinant DNA technology and cross-linked by
-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 -radiationincreased the moduli (cross-link density) of hydrogels. The hydrophobic folding and assembly phasetransition that occurred on raising the temperature was demonstrated to have significant effects on moduliand fracture properties. Thermoelasticity experiments suggest that the phase transition involves changesin elasticity mechanism. Above the transition temperature, hydrogels were shown to become moreviscoelastic.
-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 -radiationincreased the moduli (cross-link density) of hydrogels. The hydrophobic folding and assembly phasetransition that occurred on raising the temperature was demonstrated to have significant effects on moduliand fracture properties. Thermoelasticity experiments suggest that the phase transition involves changesin elasticity mechanism. Above the transition temperature, hydrogels were shown to become moreviscoelastic.