Abstract
The fracture surface micromorphology of noon 66 and its blends was examined. A patchy appearance, found at low ΔK values when levels of imbibed moisture and impact modifier are low, is believed to result from a void coalescence mechanism. At higher water contents and levels of impact-modification, the fracture surface assumes a rumpled appearance with numerous secondary fissures oriented normal to the crack direction; the inter-rumple spacings, however, do not correspond to the macroscopic growth rate, A model to explain rumple formation is presented. The fatigue fracture surface appearance of unmodified nylon 66 is found to depend on both moisture content and test temperature. Trans-spherulitic fracture is found when the test temperature is below the glass transition temperatureT g (measured at 110 Hz) for a given water content, while at higher test temperatures a high degree of drawing is evident. It is concluded that the fracture surface micromorphology of nylon 66 and its blends depend strongly on the viscoelastic state of the polymer.
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Hahn, M.T., Hertzberg, R.W. & Manson, J.A. Effects of rubbery phase and absorbed water on impact-modified nylon 66. J Mater Sci 21, 39–45 (1986). https://doi.org/10.1007/BF01144696
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DOI: https://doi.org/10.1007/BF01144696