Abstract
In this paper, results of morphological studies on the 15/85 (m/m) blend of a high-density polyethylene (HDPE) and a homogeneous ethylene copolymer with 5.2mol% 1-octene are presented. Morphological changes in the blend during cooling and subsequent heating at 10°C/min were monitored via synchrotron small-angle X-ray scattering (SAXS). SAXS data were analyzed by means of the correlation function. An appropriate procedure of the correlation function treatment was described to obtain a local volume fraction crystallinity (ΦL) of the sample. Owing to this a real progress of morphological parameters was obtained. It was found that crystallization by slow cooling of the investigated blend leads to an extensive separation of its components according to their ethylene sequence length. The semicrystalline morphology of the blend is best described by the lamellar insertion model. The thin lamellae of crystallizing copolymer are formed between the thicker primary lamellae of HDPE yielding a drastic decrease of the long period. During subsequent heating lamellae melt in the reversed sequence of their formation.
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