Abstract
Paperboard is an environment-friendly multi-layer material widely used for packaging applications. However, for food packaging paperboard lacks essential barrier properties towards oxygen and water vapor. Conventional solutions to enhance these barrier properties (e.g. paperboard film coating with synthetic polymers) require special manufacturing facilities and difficult the end-of-life disposal and recycling of the paperboard. Paperboard coating with silica-based formulations is an eco-friendly alternative hereby disclosed. Silica-nanocoatings were prepared by sol-gel synthesis, with or without the addition of Zn(2)-Al-NO3 layered double hydroxides (LDHs), and applied on the surface (ca 2 g/m2) of industrial paperboard samples by a roll-to-roll technique. The physicochemical features of silica-nanocoatings were studied by FTIR-ATR, SEM/EDS, XRD analysis and surface energy measurements. The barrier properties of uncoated and silica-coated paperboard were accessed by water vapor transmission rate (WVTR) and oxygen permeability (Jo2) measurements. The best barrier results were obtained for paperboard coated with a mixture of tetraethoxysilane (TEOS) and 3-aminopropyltriethoxysilane (APTES), with and without the incorporation of LDHs.
Highlights
Paperboard is a thick paper-based multi-layer material with numerous applications due to its structural stability, lightweight, printable surface, attractive shelf-display and ease of recovery for recycling or end-of-life disposal
Uncoated paperboard was supplied with a conventional surface treatment applied on the front side to improve
This is confirmed by the oxygen and water vapor barrier properties results presented in Table 2 for paperboard coated with silica formulations prepared using various precursors with and without the incorporation of layered double hydroxides (LDHs)
Summary
Paperboard is a thick paper-based multi-layer material with numerous applications due to its structural stability, lightweight, printable surface, attractive shelf-display and ease of recovery for recycling or end-of-life disposal. In comparison with traditional glass and plastic containers paperboard is unsuitable for some foodpackaging applications due to poorer barrier protection against grease, water vapor, oxygen, odors and other substances. Conventional solutions to improve these barrier properties include paperboard wax impregnation or surface coating with petroleum-derived polymer films [1]-[4]. Since both strategies reduce the recyclability and biodegradability features of paperboard in recent years several biopolymers (e.g. starch, cellulose, chitosan, pectin, xylan, isolated soy protein, pullulan among others) have been screened as alternative sustainable coatings for packaging applications [5]-[11]. Inorganic nanoparticles can be synthesized in situ in the matrix of the biopolymer, forming organic-inorganic hybrid coatings [10]-[12]
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