Abstract
The glass transition and the sub-glass relaxation of an epoxy resin at different frequencies have been investigated by ultrasonic and dynamic mechanical methods. The frequency dependence of the glass transition is described by the principle of time(frequency)-temperature superposition. This physical model allows us to justify the position of the glass transition in the ultrasonic frequency (megahertz) range. Then, the ultrasonic technique was used to characterize the influence of tungsten particle fillers on the thermal properties of the epoxy matrix in a composite material. The results show that the glass transition of the polymer phase is strongly modified by the presence of the fillers, which restricts the molecular mobility of the macromolecules.
Published Version
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