engleski

Enhancement of water permeability of biodegradable PCL nanocomposite coated paperboard packaging

Paper based materials along with other synthetic polymers are the most common materials used in packaging industry. Its main advantage, that is well known fact is that cellulose materials (paper, paperboard and cardboard), are the main biodegradable fraction of the municipal solid waste (MSW). On the other hand, the biggest setback is its high water permeability when compared with plastic material. This problem can be partly solved by preparing the polymer coating paperboard packaging. Due to this problem the printed paperboard samples coated with biodegradable PCL polymer were studied in this paper. Printed paperboard samples were prepared with modified PCL coating with SiO2 (K/P/2Si), Al2O3 (K/P/1Al) nanoparticles. Characterization of the studied samples has been made by determination of water vapor transmission rate (WVTR), mechanical and visual properties of printed paperboard. Water vapor transmission rate was made with the Herfeld apparatus using 97% sulfuric acid. The mass of the container with the sample and water is measured at the beginning and after 24 and 48 hours. The burst strength (S) was determinate according to ISO 2759 while the difference of reflectance due to the presents of nanoparticle was measured with a spectrometer (380-730nm). The visual spectral reflectance of the full tone process colors of print (Cyan, Magenta, Yellow and Black) was followed. The results show that PCL and PCL coatings with implemented SiO2 and Al2O3 nanoparticles slow down the water vapor transmission rate comparing to the paperboard without coatings.

biodegradable PCL nanocomposite ; paperboard packaging ; water permeability

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