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Frequency dependence of viscoelastic properties of medical grade silicones

✍ Scribed by A. Mahomed; N. M. Chidi; D. W. L. Hukins; S. N. Kukureka; D. E. T. Shepherd

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 116 KB
Volume: 89B
Category: Article
ISSN: 1552-4973
DOI: 10.1002/jbm.b.31208

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✦ Synopsis

Abstract

Cylinders of medical grade silicone elastomers, (29 mm in diameter and 13 mm thick), immersed in physiological saline solution at 37°C, were investigated by dynamic mechanical analysis (DMA). A sinusoidal cyclic compression of 40 ± 5 N was applied over a frequency range, f, of 0.02–100 Hz. Values of the storage, E′, and loss, E″, moduli for the cylinders were found to depend on f; the dependence of E′ or E″ on the logarithm (base 10) of f was represented by a third‐order polynomial. Above about 0.3 Hz, the cylindrical specimens appeared to be undergoing the onset of a transition from the rubbery to the glassy state. There was no significant difference between results obtained at 37 and 23°C; pretreatment of specimens in physiological saline at 37°C for 24 h and 29 days had no appreciable effect on the results. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2009

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