Determination of Activation Energy for Glass Transition of an Epoxy Adhesive Using Dynamic Mechanical Analysis |
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Authors: | G. Li P. Lee-Sullivan R. W. Thring |
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Affiliation: | (1) Department of Mechanical Engineering, University of New Brunswick, P. O. Box 4400, Fredericton, N. B., E3B 5A3, Canada |
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Abstract: | The activation energy associated with the glass transition relaxation of an epoxy system has been determined by using the three-point bending clamp provided in the recently introduced TA Instruments DMA 2980 dynamic mechanical analyzer. A mathematical expression showing the dependency of modulus measurements on the sample properties and test conditions has also been derived. The experimental results showed that the evaluation of activation energy is affected by the heating rate and test frequency, as well as the criterion by which the glass transition temperature (T g) is established. It has been found that the activation energy based on the loss tangent (tanδ) peak is more reliable than on the loss modulus (E 2) peak, as long as the dynamic test conditions do not cause excessive thermal lags. This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | activation energy dynamic mechanical analysis (DMA) epoxy adhesive glasstransition |
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