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Ultrasonics measurements were performed during the cure of epoxy resins. The results show some different comportments if there is only the gelation process which passes through the frequency window of the study or if there is also a vitrification phenomenon. The last case occurs with a high glass transition temperature epoxy resin like DGEBA‐DDS. with which the increasing glass transition temperature of the resin is rapidly higher than the study temperature. The former case happens for low Tg epoxy resin like BDGE‐HMDA. But in any case the method is very sensitive to the mechanical properties evolution of the material.
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Lairez et al. (1991) studied this question.
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