Gas and moisture barrier on bio-based packaging materials by atomic layer deposition

摘要

Packaging materials consist often of layers of different polymers and aluminum foil, which makes sorting, and material and energy recovery challenging. On the other hand, barrier properties of biopolymers, especially against moisture, are not yet on a sufficient level for more demanding packaging applications. New innovations are thus needed in order to develop new packaging materials to enhance the packaging performance. For thin film barrier materials promising new aspects may be found in the improved performance and waste management In our previous studies [1-2] we have demonstrated significantly enhanced barrier properties towards oxygen and water vapor with thin Al_2O_3 coatings using the atomic layer deposition (ALD). In addition to these studies, the effect of corona pre-treatment on the performance of Al_2O_3 and SiO_2 gas barrier layers applied by ALD onto polymer coated paperboards was studied [3]. For SiO_2 depositions a new precursor, bis(diethylamido) silane, was used.