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ABSTRACT: The transfer properties of chitosan coated polyethylene (PE) films were studied. The barrier properties of non coated PE were not affected by relative humidity changes. The presence of the hydrophilic chitosan layer acted as a water reservoir on the polyethylene film surface which significantly promoted its sensitivity to the water vapour. The water vapour permeability increased 1.85 times at a higher RH. Coated PE films showed more than two-order decrease in the oxygen permeability (PO2) and three-order-decrease in the carbon dioxide permeability (PCO2). When the chitosan coated PE surface was exposed to the water vapour, the PO2 and the PCO2 were significantly increased. However, the permeability of the chitosan self standing film depended on the solvent type, glycerol, permeate nature and the environmental humidity. The addition of ethanol during the film processing decreased PO2, PCO2 and Pair while glycerol had the opposite effect.
Journal of Membrane Science 06/2012; 403-404:162–168. · 3.85 Impact Factor
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Kurek,
Mia,
Ščetar,
Mario,
Brachais,
Claire- Hélène,
Nguimjeu,
Christelle Mary,
Voilley,
Andree,
Galić,
Kata,
Debeaufort,
Frederic
[show abstract]
[hide abstract]
ABSTRACT: The transfer properties of chitosan coated polyethylene (PE) films were studied. The barrier properties of non coated PE were not affected by relative humidity changes. The presence of the hydrophilic chitosan layer acted as a water reservoir on the polyethylene film surface which significantly promoted its sensitivity to the water vapour. The water vapour permeability increased 1.85 times at a higher RH. Coated PE films showed more than two-order decrease in the oxygen permeability (PO2) and three-order-decrease in the carbon dioxide permeability (PCO2). When the chitosan coated PE surface was exposed to the water vapour, the PO2 and the PCO2 were significantly increased. However, the permeability of the chitosan self standing film depended on the solvent type, glycerol, permeate nature and the environmental humidity. The addition of ethanol during the film processing decreased PO2, PCO2 and Pair while glycerol had the opposite effect.
Journal of Membrane Science 06/2012; 403-404:162-168. · 3.85 Impact Factor
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Kurek,
Mia,
Klepac,
Damir,
Ščetar,
Mario,
Galić,
Kata,
Valić,
Srećko,
Liu,
Yong,
Yang,
Weimin
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ABSTRACT: In this research, linear low-density polyethylene (PE-LLD), cast polypropylene (PPcast), and bioriented coextruded polypropylene (BOPP) were used as polymeric materials. Permeability, diffusivity, and solubility of N2, O2, and CO2 through above polymers were obtained at different temperatures. The structure and thermal–mechanical features of the films were characterized by scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The permeability, diffusivity, solubility, and their temperature dependency were studied by correlations with gas molecule properties. The highest permeation coefficients (>3.8 × 10−8 cm3 cm−1 s−1 bar−1) are obtained for PPcast at 60 °C. Activation energy for permeation follows the sequence: N2 > O2 > CO2 for PE-LLD and PPcast. On the other hand, the diffusion activation energy follows the order: O2 > CO2 > N2 and N2 > CO2 > O2 for PE-LLD and PPcast, respectively. In the case of BOPP, activation energy follows the sequence: O2 > CO2 > N2 ; CO2 > N2 > O2 ; and O2 > CO2 > N2 for permeation, diffusion, and heat of sorption, respectively.
Polymer Bulletin 05/2011; 67(7):1293-1309. · 1.53 Impact Factor
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Croatian Journal of Food Technology, Biotechnology and Nutrition. 01/2010; 5(3-4):69-86.
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Croatian Journal of Food Science and Technology. 01/2010; 2(1):32-48.
