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A. Rozpłoch, A. Stasiek, J. Dzwonkowski, J. Patyk, J. Czupryńska

X-ray diffraction studies on the degree of crystallinity in polypropylene films by the Marquart—Levenberg optimization procedure

Polimery 2002, No 2, 90


DOI: dx.doi.org/10.14314/polimery.2002.090


Summary

The degree of crystallinity (Sk) of six samples of an extruded i-PP F-401 film was studied by XRD (D-500 diffractometer and CuKa rays) in relation to the temperature (20-70 °C) of extruder's cooling rolls. The difractograms were decomposed by the M—L method into component curves (Figs. 7—8); the curves showing half-widths lower than 4° were assigned to the crystal phase and the remaining curves were attributed to the amorphous phase. As the temperature of the cooling rolls was increased, the Sk-values rose almost linearly to attain a maximum value of 56% (Table 2, Fig. 9); so rose the degree of hazing (Z) (Fig. 9). The present method lends itself to measuring Sk in polymeric materials and needs no amorphous standards.


Keywords: X-ray diffraction, degree of crystallinity of extruded i-PP films

A. Rozpłoch, A. Stasiek, J. Dzwonkowski, J. Patyk, J. Czupryńska (519.1 KB)
X-ray diffraction studies on the degree of crystallinity in polypropylene films by the Marquart—Levenberg optimization procedure