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This study focuses on the possibility of improving performance properties of polyamide-6 (PA6) nanocomposite films for packaging application using nanoclay masterbatch. Different concentrations of nanoclay in PA6 were prepared through melt-mixing of particulate nanoclay and nanoclay masterbatches in a twin screw compounder, then film samples were molded using a hot press. Oxygen barrier properties were then measured and interpreted on the basis of different theoretical approaches. Also, a correlation between morphology and properties of the studied nanocomposites was observed, and all prepared nanocomposites exhibited performance improvement with increasing the nanoclay content. The masterbatch-based nanocomposite films showed more exfoliated regions that leading to the enhancement of the mechanical properties. Gas permeability through nanocomposite films decreased significantly just by loading a small amount of nanoclay. However, surprising behavior in oxygen permeability observed at higher levels of nanoclay in masterbatch-based nanocomposite was attributed to the decreased crystallinity of PA6 matrix. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 125: E2-E8, 2012

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The purpose of the present study was to investigate the effect of cellular structure on the impact strength of polypropylene/polyolefin elastomers blend foams produced by the continuous extrusion process. To create different cell sizes, two chemical blowing agents were employed: azodicarbonamide and sodium bicarbonate. Sodium bicarbonate created foams with bigger cell size and cell wall thickness than azodicarbonamide. The impact strength of the neat and blend foams were studied and correlated to the foam properties and structure. It was observed that the impact strength of blend foams was directly related to the concentration of polyolefin elastomers (POE). Increasing POE by up to 30 wt% increased the foam impact strength by more than 400%. On the other hand, Increasing POE content caused the cell size and cell wall thickness to be reduced. Moreover, an attempt has been made to establish a relationship between the impact strength and cellular structural parameters. It was found that in the blend foams with higher cell wall thickness the rough fracture of the cell walls was intensified and in turn, the impact strength of the foams improved further.

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