The gel point of TGDDM-based epoxy resin MY721 (Ciba Geigy) mixed with DDS (Sigma) was determined using multiwave, dynamic-time and steady-time tests. The gel times from each test agreed within experimental variations and the effects of temperature, sample size and shear rate are discussed. New methods of determining the gel point of thermosetting resins are discussed using multiwave tests and normal stress measurements during steady shear tests.
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