Journal of Polymer Science Part B: Polymer Physics, Vol.43, No.9, 1090-1099, 2005
Online wide-angle X-ray diffraction/small-angle X-ray scattering measurements for the CO2-laser-heated drawing of poly(ethylene terephthalate) fiber
Fiber-structure-development in the poly(ethylene terephthalate) fiber drawing process was investigated with online measurements of wide-angle and small-angle X-ray scattering with both a high-luminance X-ray source and a CO2-laser-heated drawing system. The intensity profile of the transmitted X-ray confirmed the location of the neck-drawing point. The diffraction images had a time resolution of several milliseconds, and this still left much room for improvement. Crystal diffraction appeared in the wide-angle X-ray images almost instantaneously about 20 ms after necking, whereas a four-point small-angle X-ray scattering pattern appeared immediately after necking. With the elapse of time after necking, the four-point scattering pattern changed into a meridional two-point shape. (c) 2005 Wiley Periodicals, Inc.