Abstract
Lignin, esterified with palmitic and lauric acid chloride, has been studied for the application as coating on fiber-based packaging material. The aim was to improve the barrier properties against water vapor and oxygen of paperboard. The esterification was followed by Fourier transform infrared spectroscopy, 31P nuclear magnetic resonance spectroscopy, and gel permeation chromatography measurements. The lignin esters were applied on paperboard and formed a continuous film. The moisture barrier property of the coated paperboards was characterized by the water vapor transmission rate (WVTR). A significant decrease in WVTR was observed, for example, 40 g m-2 (for 24 h) for a paperboard coated with 10.4 g m-2 hardwood kraft lignin palmitate. The contact angle of water on the lignin ester coatings was high and stable. For all paperboard samples coated with lignin esters, a significant decrease in oxygen transmission rate was observed. Accordingly, lignin palmitate and laurate have a high potential as a barrier materials in packaging applications.
The study is part of the two LigniVal projects in the Tekes BioRefine program. Funding to the VTT/Industrial consortium (Tekes, Stora Enso Oyj, UPM-Kymmene Oyj, Metsäliitto Group, Myllykoski Oyj) and VTT/University consortium (Tekes, Metso Power Oy, Oy Metsä-Botnia Ab, Stora Enso Oyj, Roal Oy) is acknowledged.
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