Abstract
The variation of fracture and mechanical properties of epoxy resin Epikote 828, cured with diaminodiphenyl-methane by variation of the resin/amine ratio has been determined. Observations of the crack tip have shown that fracture toughness variations can be attributed to the different blunting characteristics of the various resin/amine compositions. A systematic variation in the thermal transitions of the resins also occurs as a function of composition. Investigations by chemical etching and small angle X-ray scattering have failed to reveal a structural entity which can be invoked to explain the trends in fracture and mechanical properties.
It has been found that care must be taken when choosing the method of evaluation of fracture parameters in order that meaningful comparisons can be made between different resin compositions.
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Selby, K., Miller, L.E. Fracture toughness and mechanical behaviour of an epoxy resin. J Mater Sci 10, 12–24 (1975). https://doi.org/10.1007/BF00541027
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DOI: https://doi.org/10.1007/BF00541027