Abstract
The equatorial streak in the small-angle X-ray scattering (SAXS) pattern from nylon-6 fibers, normally assigned to microvoids or to internal fibrillar structure, is due to scattering from the fiber surfaces. This scattering is best thought of as refraction by the cylindrical fibers. The streak intensity increases by 50 times during the early stages of drying a wet bundle of nylon-6 fibers, when superficial water, water between the fibers in the bundle, is lost. Separate X-ray experiments using a nonpenetrating fluid, a large diameter monofilament, and microbeam SAXS confirmed this assignment. There are many fibers where internal voids are known to be the source of a strong equatorial streak in SAXS, but in general, a check for surface scattering is advised before interpreting this feature. Simultaneous small- and wide-angle X-ray diffraction (WAXD) was obtained during drying. Following the initial loss of superficial water, there are changes in both the WAXD reflections and the SAXS lamellar reflection. I...
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