SMALL-ANGLE AND WIDE-ANGLE X-RAY-SCATTERING CHARACTERIZATION OF 1-HEXENE LINEAR LOW-DENSITY POLYETHYLENE

Four ethylene-1-hexene copolymer samples were studied by small-angle X -ray scattering in order to investigate the correlation between the cr ystalline lamellar thickness and the comonomer content. The lamellar t hickness was determined from the identity period of the one-dimensiona l scattering function and from the analysis of the one-dimensional cor relation function. The crystallinity and the volume of the crystalline unit cell were determined by wide-angle X-ray scattering. Some consid erations are reported on the effect of the side chains during the crys tallization and on the polydispersity of the lamellar thickness.