Lamellar crystal thickness transition of melt-crystallized isotactic polybutene-1 observed by small-angle X-ray scattering

Abstract

The first-order long period L1, the second-order long period L2 and lamellar crystal thickness lc of isotactic polybutene-1 have been investigated for crystallization in the melt over a wide range (313.2 to 363.2 K) of crystallization temperatures by small-angle X-ray scattering experiments and density measurements. The long period L1 shows a single linear dependence on inverse supercooling. The crystal thickness lc, however, demonstrates two linear dependences on inverse supercooling and a transition from one dependence to the other has been observed around 338.2 K, where lc becomes comparable with the radius of gyration Rg of the samples.