Two ethylene-octene copolymers with 17 and 45 wt.% of octene (EOC-17 and EOC-45) were compared in nanocomposites with Cloisite 93A. EOC-45 nanocomposites have a higher elongation at break. Dynamical mechanical analysis (DMA) showed a decrease oftan⁡δwith frequency for EOC-17 nanocomposites, but decrease is followed by an increase for EOC-45 nanocomposites; DMA showed also increased modulus for all nanocomposites compared to pure copolymers over a wide temperature range. Barrier properties were improved about 100% by addition of organoclay; they were better for EOC-17 nanocomposites due to higher crystallinity. X-ray diffraction (XRD) together with transmission electron microscopy (TEM) showed some intercalation for EOC-17 but much better dispersion for EOC-45 nanocomposites. Differential scanning calorimetry (DSC) showed increased crystallization temperatureTcfor EOC-17 nanocomposite (aggregates acted as nucleation agents) but decreaseTcfor EOC-45 nanocomposite together with greatly influenced melting peak. Accelerated UV aging showed smaller C=O peak for EOC-45 nanocomposites.

The article deals with preparation, properties and usage of ethylene-octene copolymers/clay films. Different properties of two types of ethylene-octene copolymers (Engage 8540 and Engage 8842) with 17 and 45 wt% of octene (EOC-17 and EOC-45) were compared in nanocomposites with two types of clays-Cloisite 93A and Dellite 67. The aim was to evaluate the influence of (nano)filler type on ethylene-octene nanocomposites properties. Mechanical and thermal properties, morphology, and UV radiation degradation were observed. Furthermore, permeability of three different gasses was determined. EOC nanocomposites perform a higher elongation at break, especially EOC-45. Dynamic Mechanical Analysis (DMA) showed an increase of E 0 modulus of all nanocomposites in a wide range of temperatures compared to pure EOC. Intercalation of nanofillers was studied by transmission electron microscopy (TEM) and X-ray diffraction (XRD). It has been proved that EOC-45 has a better dispersion EOC-17. DSC analysis showed a shift in a crystallization temperature for EOC-17, where the nanofiller acted as a nucleation agent due to the worse dispersion. Barrier properties were improved by almost 100% by addition of organoclay for all measured gasses; they were best for EOC-17 nanocomposites due to a higher crystallinity. XRD together with transmission electron microscopy (TEM) showed much better dispersion for EOC-45 nanocomposites. Fourier transform infrared spectroscopy (FTIR) and accelerated UV aging showed C@O peaks for EOC nanocomposites. POLYM. COMPOS., 00:000-000, FIG. 3. DMA graphs temperature dependencies: EOC-17 (Engage 8540) with 5% Cloisite 93 and Dellite 67, EOC-45 (Engage 8842) with 5% Cloisite 93 and Dellite 67: (a) E 0 modulus, (b) tan d. [Color figure can be viewed at wileyonlinelibrary.com]

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