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Effect of moisture on the static and viscoelastic shear properties of epoxy adhesives


The effects of moisture on the structural properties of two commercially available adhesives, FM73M and FM300M, are investigated. The experimental study consists of static and viscoelastic shear measurements made from bonded joint specimens soon after they were cured and after lengthy exposure in 63% and 95% relative humidity environments. Static shear modulus and shear creep compliance data for each adhesive at each moisture level throughout a wide range of temperatures are illustrated. Also shown are the effects of temperature and moisture on the ultimate shear strength behaviour, and the temperature and moisture viscoelastic shift functions. It is concluded that the effect of moisture as an external plasticizer on the shear properties of these adhesives is equivalent to raising the environmental temperature.

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Jurf, R.A., Vinson, J.R. Effect of moisture on the static and viscoelastic shear properties of epoxy adhesives. J Mater Sci 20, 2979–2989 (1985).

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  • Shear Strength
  • Shear Modulus
  • Moisture Level
  • Humidity Environment
  • Shift Function