Optimization of polyethylene/binder/polyamide extrusion blow‐molded films. III. Slippability improvement with fatty acid amides |
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Authors: | C Poisson V Hervais M F Lacrampe P Krawczak T Falher C Gondard V Ferreiro |
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Affiliation: | 1. Polymers and Composites Technology and Mechanical Engineering Department, Ecole des Mines de Douai, 941 Rue Charles Bourseul, BP 10838, 59508 Douai Cedex, France;2. Email:lacrampe@ensm‐ douai.fr;5. Institut Supérieur de Plasturgie d'Alen?on, P?le Universitaire de Montfoulon, 61250 Alen?on Damigny, France;6. Unite Mixte de Recherche 8008, Unité de Formation et de Recherche de Physique, Laboratoire de Structure et Propriétés à l'Etat Solide, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France |
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Abstract: | The slippability of packaging films has to be controlled to facilitate confectionary operations and guarantee an easy opening for filling. In the case of single‐layer polyethylene (PE) films, the addition of slip agents made of fatty acid amides such as erucamide or oleamide usually allows the tailoring of the coefficient of friction (COF) in the film to match industrial targets, which depend on the final application. The coupling of Fourier transform infrared spectroscopy and atomic force microscopy analysis showed that this method has a limited efficiency and may even be detrimental in the case of multilayer PE + ethylene vinyl acetate (EVA)/maleic anhydride grafted polyethylene (PEgMAH) + EVA/polyamide films. The reason is that the migration of the slip additives toward the outermost surface of the PE layer, which leads to a reduction in the COF, are strongly affected by both the existence of the adjacent layers and the presence of EVA in the PE and PEgMAH layers. Nevertheless, a proper knowledge of the effect of this perturbation allows one to reach a slippability level that is required for some confectionary operations and/or for an easy opening for filling without the degradation of the heat sealability. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 |
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Keywords: | additives atomic force microscopy (AFM) blends films FT‐IR |
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