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Scanning electron microscopy (SEM) micrograph of different fracture surfaces. (a) crack initiation site of neat epoxy; (b) fast fracture site of neat epoxy; (c) crack initiation site 2 wt % V-clay epoxy; (d) fast fracture site of 2 wt % V-clay epoxy; (e) crack initiation site of 2 wt % D-clay epoxy; and (f) fast fracture site of 2 wt % D-clay epoxy.
