Crystallization of the γ-form of isotactic poly(propylene), 2. Synchrotron radiation measurements

Synchrotron radiation measurements were employed in recording wide- and small-angle X-ray diffraction patterns during the crystallization of isotactic poly(propylene) in γ-form. In particular, crystallization phenomena of this form are reported for a fraction of a random propylene-ethylene copolymer (4 wt.-% of ethylene) previously investigated by traditional diffraction methods. On slow cooling from the melt, the main decrease in long period L occurs between 88 and 76°C where the degree of crystallinity is almost constant. This may be explained by a flattening of lamellae.