IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control · 1999 · 20 citations · 5 references
Natural SciencesMaterials EngineeringMaterials ScienceAcousticsPolymer EngineeringPolymer MaterialsAcoustic DiagnosticsAcoustic MaterialsAcrylic Resin MaterialsPolymerization StressUltrasonicsUltrasound PhysicsAcoustic ImpedanceAcoustic Material CharacterizationAcoustic Phase VelocityEpoxy ResinsResin Material PropertiesUltrasonic AcousticsUltrasonic Materials CharacterizationUltrasonic Testing
This work concerns monitoring the polymerization of an epoxy resin and its hardener. An ultrasonic pulse echo technique was used to monitor the attenuation, the phase velocity, and the acoustic impedance of the resin as a function of time. The first two parameters give information about the average state of the hardening of the resin itself. The third parameter, acoustic impedance, indicates the state of the hardening of the resin at the interface with the vessel. These parameters are determined from spectral properties of echoes extracted from the experimental echo waveforms. Experiments were made for different proportions of hardener and allowed a determination of the best mixture (10% of hardener) that corresponds to the manufacturer's recommended value. Analysis of the results shows a progressive hardening from the center of the resin toward the walls of the vessel.
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