Aggregation structure and fatigue characteristics of (nylon 6/clay) hybrid

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Abstract
A nylon 6/montmorillonite clay hybrid (NCH) with montmorillonite of 2 wt% was prepared. Transmission electron microscopy (TEM) of NCH revealed that the silicate layers of montmorillonite were molecularly dispersed in nylon 6 matrix. Wide angle X-ray diffraction (WAXD) study revealed that crystallites formed in both NCH and nylon 6 were the y-form, and the crystallite size in NCH was larger than that in nylon 6. The temperature dependence of dynamic viscoelasticity of NCH revealed that the magnitude of αa-absorption of amorphous phase of nylon 6 in NCH was smaller than nylon 6, suggesting the restriction of thermal molecular motion in NCH due to the strong ionic interaction between nylon 6 and silicate layers. The fatigue lifetime for NCH was longer than that for nylon 6 and nylon 6 reinforced with surface-modified short glass-fiber(SMSGF/N6) under the identical fatigue conditions, even though they showed almost the same moduli. Fatigue fracture criterion based on energy loss dissipated for irreversible structural change was investigated for NCH, and it was revealed that the total viscoelastic energy loss dissipated for irreversible structural change up to fatigue failure of NCH was larger than that for nylon 6 and (SMSGF/N6). This indicates that the fatigue strength of NCH is superior to that of nylon 6 and (SMSGF/N6).

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