Abstract
Selected mechanical properties of (+45°)4S graphite/epoxy composites have been found to be affected by sub-Tg annealing. Postcured (±45°)4S specimens of Thornel 300 graphite/Narmco 5208 epoxy were sub-Tg annealed at 413K (140°C) for ca. 10, 102, 103 104, and 105 min., with a prior quenching from above Tg. The ultimate tensile strength (UTS), strain-to-break (εB), and toughness of the composite materials were found to decrease as a function of sub-Tg annealing time. No weight loss were observed during the sub-Tg annealing. The time-dependent change in properties can be explained on the basis of physical aging which is related to free volume changes in the non-equilibrium glassy state of network epoxies. The results imply possible changes in composite properties with service time.
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© 1984 Plenum Press, New York
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Kong, E.S. (1984). Physical Aging and its Long-Term Effect on the Durability and Reliability of Advanced Structural Epoxies and Epoxy-Based Graphite-Fiber Composites. In: Bailey, W.J., Tsuruta, T. (eds) Contemporary Topics in Polymer Science. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6743-1_42
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DOI: https://doi.org/10.1007/978-1-4615-6743-1_42
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