Properties of photocured epoxy resin materials for application in piezoelectric ultrasonic transducer matching layers

Alexandre Troge, Richard O'Leary, Gordon Hayward, Richard Pethrick, Anthony Mulholland

Research output: Contribution to journalArticle

8 Citations (Scopus)
1136 Downloads (Pure)

Abstract

This paper describes the acoustic properties of a range of epoxy resins prepared by photocuring that are suitable for application in piezoelectric ultrasonic transducer matching layers. Materials, based on blends of diglycidyl ether of Bisphenol A and 1,4-cyclohexanedimethanol diglycidyl ether, are described. Furthermore, in order to vary the elastic character of the base resin, samples containing polymer microspheres or barium sulfate particles are also described. The acoustic properties of the materials are determined by a liquid coupled through transmission methodology, capable of determining the velocity and attenuation of longitudinal and shear waves propagating in an isotropic layer. Measured acoustic properties are reported which demonstrate materials with specific acoustic impedance varying in the range 0.88–6.25 MRayls. In the samples comprising blends of resin types, a linear variation in the acoustic velocities and density was observed. In the barium sulfate filled samples, acoustic impedance showed an approximately linear variation with composition, reflecting the dominance of the density variation. While such variations can be predicted by simple mixing laws, relaxation and scattering effects influence the attenuation in both the blended and filled resins. These phenomena are discussed with reference to dynamic mechanical thermal analysis and differential scanning calorimetry of the samples.
Original languageEnglish
Pages (from-to)2704-2714
Number of pages11
JournalJournal of the Acoustical Society of America
Volume128
Issue number5
DOIs
Publication statusPublished - Nov 2010

Keywords

  • acoustic impedance
  • ultrasonic transducers
  • resins
  • piezoelectric transducers
  • filled polymers
  • elasticity
  • dynamic testing
  • differential scanning calorimetry
  • curing
  • barium compounds
  • anelastic relaxation
  • acoustic wave velocity
  • acoustic wave transmission
  • acoustic wave scattering
  • acoustic wave absorption

Cite this