TIT# Simultaneous Measurements of Small- and Wide-Angle X-Ray Scattering
     During Low Speed Spinning of Poly(propylene) Using Synchrotron Radiation
AUT# Kolb, Rainer; Seifert, Soenke; Stribeck, Norbert; Zachmann, Hans Gerhard;
SOU# Polymer (2000), 41, 1497-1505
LOC# xv050
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ABS# Simultaneous measurements of small- and wide-angle X-ray scattering (
     SAXS and WAXD) were performed during the melt spinning of
     isotactic poly(propylene).  The extruder assembly was mounted on a
     platform, which could be moved horizontally and vertically allowing
     variations of the measuring point between distances of 28 and 90 cm from
     the spinneret.  The SAXS and WAXD pattern were taken
     simultaneously with two two-dimensional detectors.  Addnl., the fiber
     diameter profile was measured.  The development of the crystallization and the
     orientation of the crystallites were studied as a function of the distance
     from the spinneret.  The wide-angle data revealed that highly oriented
     crystals grow out of an apparently unoriented amorphous matrix.  Moreover,
     the orientation of the crystallites was found to be constant along the spin
     line.  Both crystalline WAXD and SAXS peaks were found to occur at
     the same distance from the spinneret within the resolution of the apparatus  A
     comparison of WAXD and SAXS shows that the crystallization and the
     formation of a superstructure follow the same kinetics.