Characterising epoxy-amine vibration damping properties for high- frequency applications Caroline Uncles 1 , Dr Peter Roth 2 , Kevin Hunt 3 , Shirley Fong 3 , Dr Andrew Viquerat 1 1 Department of Mechanical Engineering, University of Surrey, UK, 2 Department of Chemistry, University of Surrey, UK, 3 AWE, UK Epoxy-amine resins are found in a variety of industries due to their viscoelastic properties, as well as their low cost and commercial availability. One important application of epoxy-amine systems is passive vibration damping, especially in challenging environments. The high frequency mechanical properties and performance life predictions for these resins are typically obtained using Time-Temperature Superposition (TTS) to extend the experimentally examined frequency range. This paper presents an examination of the feasibility of this approach for both bulk resins, and resins filled with zirconium tungstate powder at various weight percentages. Epoxy-amine systems of Bisphenol A diglycidyl ether, 3-(diethylamino)propylamine, poly(propylene glycol) bis(2-aminopropyl ether) and 5-amino-1,3,3- trimethylcylcohexanemethylamine are examined. Zirconium tungstate was selected as a filler because of its negative CTE, allowing thermal expansion to be included as a variable in the analysis. To isolate the role thermal expansion plays, tests done a filler with similar density and particle size, but positive CTE should allow for the isolation of the role that CTE has on damping. The material properties are characterised using dynamic mechanical analysis (DMA) and thermal mechanical analysis (TMA). Additionally, DMA is used to determine the glass transition temperature of the materials as well as collecting the material responses to a frequency sweep between 0.1-30 Hz, while the extensional high frequency properties (up to 2 kHz) are obtained using an Oberst beam method. The change in thermal expansion values are determined by TMA and subsequently the DMA and TMA data are combined to provide insight into the role thermal expansion plays on the viscoelastic properties.
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