The permeabilities of water vapour, CO2 and O2 of polyethylene films prepared from PE-LD, PE-LLD and PE-LD/PE-LLD blends of various compositions were compared. Permeability of water vapour decreases in a similar manner as in the case of permeability of gases in general with increase in film thickness for all types of film investigated. This decrease in permeability of water vapour for PE-LLD films 0.015—0.03 mm thick is more pronounced than in the case of similar PE-LD films. The influence of film thickness becomes very small for thicknesses above 0.03 mm. The permeability of CO2 and O2 for PE-LLD film and for film made of PE-LD/PE-LLD blends is lower than that of PE-LD film. From a combined comparison of mechanical and barrier properties it can be concluded that films made of PE-LLD and PE-LD/PE-LLD blends are better barrier materials than PE-LD films.
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