Ultrasonic measurements of an epoxy resin near its sol-gel transition

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Abstract

Measurements of the change in attenuation and transit time of high-frequency (5 MHz) longitudinal sound waves through an epoxy resin as it proceeds through the sol-gel transition are presented. The transition from viscoelastic liquid to elastic solid results from the formation of permanent cross-links and is well suited to an interpretation in terms of percolation concepts. At high frequency, the exponents k and t, which describe the critical behavior of the viscosity and elasticity, respectively, are modified considerably as compared with corresponding static values, but in a manner consistent with extensions of percolation theory to the high-frequency regime. Interestingly, it is observed that at high frequency, dangling chains appear to contribute to the elasticity, resulting in the exponent t approaching , that of the gel fraction.

Original languageEnglish
Pages (from-to)391-399
Number of pages9
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume48
Issue number1
DOIs
StatePublished - 1993
Externally publishedYes

Fingerprint

Epoxy Resin
Sol-gel
epoxy resins
ultrasonics
gels
Elasticity
elastic properties
Exponent
exponents
Percolation Theory
transit time
Critical Behavior
sound waves
Attenuation
Viscosity
attenuation
Liquid
viscosity
liquids

All Science Journal Classification (ASJC) codes

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics

Cite this

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abstract = "Measurements of the change in attenuation and transit time of high-frequency (5 MHz) longitudinal sound waves through an epoxy resin as it proceeds through the sol-gel transition are presented. The transition from viscoelastic liquid to elastic solid results from the formation of permanent cross-links and is well suited to an interpretation in terms of percolation concepts. At high frequency, the exponents k and t, which describe the critical behavior of the viscosity and elasticity, respectively, are modified considerably as compared with corresponding static values, but in a manner consistent with extensions of percolation theory to the high-frequency regime. Interestingly, it is observed that at high frequency, dangling chains appear to contribute to the elasticity, resulting in the exponent t approaching , that of the gel fraction.",
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AB - Measurements of the change in attenuation and transit time of high-frequency (5 MHz) longitudinal sound waves through an epoxy resin as it proceeds through the sol-gel transition are presented. The transition from viscoelastic liquid to elastic solid results from the formation of permanent cross-links and is well suited to an interpretation in terms of percolation concepts. At high frequency, the exponents k and t, which describe the critical behavior of the viscosity and elasticity, respectively, are modified considerably as compared with corresponding static values, but in a manner consistent with extensions of percolation theory to the high-frequency regime. Interestingly, it is observed that at high frequency, dangling chains appear to contribute to the elasticity, resulting in the exponent t approaching , that of the gel fraction.

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