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added during PET synthesis to induce clarity and improve properties or processing ability. Commonly used comonomers in the PET polymer are either acid or diol monomers. Acid monomers are fatty acids, isophthalic acids, phthalates and other aliphatic/aromatic acids etc. and diol monomers are cyclohexanedimethanol (CHDM), polyethylene glycol (PEG), etc. [4–6]. Improved gas barrier properties is important for PET and copolyesters to find applications in food packaging industries. For instance, O 2 gas permeation into the plastic packaged walls of food containers or CO 2

1 Introduction It is generally acknowledged that despite their limitations in industrial use for being mechanically weak and poor barriers to water, biodegradable films can significantly mitigate some of the environmentally related concerns associated with synthetic films. Although a majority of hydrocolloid-based films are characterized by brittleness, the brittleness is more pronounced in some selected films such as zein-based films. Zein possesses excellent film forming and gas barrier properties. However, poor water barrier properties, brittleness and

Highlights – Zein–corn starch films prepared in presence and absence of gallic acid – Effect of gallic acid on film properties investigated – Gallic acid improved mechanical and water barrier properties in zein films – Gallic acid reduced tensile strength and increased water vapor permeability in composite films. – Comparatively, better film properties in gallic acid untreated composite films than in treated ones. 1 Introduction It is generally well established that films produced from biodegradable natural polymers such as zein and corn starch are

10 Swelling and barrier properties The largest interest in cellulose nanoparticles for composite applications originates from the outstanding mechanical properties imparted to the material. Improved properties can often be reached for low filler volume fraction without detrimental effect on other properties, such as impact resistance of plastic deformation capabil- ity. However, there is an increasing interest in the barrier properties of nanocellulose films or related nanocomposites due to increased tortuosity provided by nanopar- ticles. Indeed, because of

10 Swelling and barrier properties The largest interest in cellulose nanoparticles for composite applications originates from the outstanding mechanical properties imparted to the material. Improved properties can often be reached for low filler volume fraction without detrimental effect on other properties, such as impact resistance of plastic deformation capabil- ity. However, there is an increasing interest in the barrier properties of nanocellulose films or related nanocomposites due to increased tortuosity provided by nanopar- ticles. Indeed, because of

Nordic Pulp and Paper Research Journal Vol 23 no. 1/2008 87 KEYWORDS: Greaseproof papers, Paper properties, Barrier properties, Oxygen barrier, Coatings, Starch SUMMARY: Three greaseproof papers with different furnishes and different porosities were coated with starch to study the influence of the base paper on the oxygen transmission rate of the coated papers. The coating was performed on a bench scale and two coat weights were applied: 6.6 and 11.2 g/m2. The base papers were characterised by air permeance, porosity and mer- cury intrusion porosimetry

, packaging paper should have good barrier properties, such as water vapor resistance and grease resistance for the sake of protecting the goods packed (Dang et al. 2017 ). Therefore, hydrophobic paper with good barrier properties would be of interest to the packaging industry. Figure 1 Chemical structure of (a) cellulose, (b) AKD, and (c) PVA. R 1 and R 2 are alkyl groups. Alkyl ketene dimer (AKD), generally produced from C-14 to C-20 fatty acids and their derivatives has been widely used as an internal sizing agent in papermaking industry to enhance the water

81Nordic Pulp and Paper Research Journal Vol 18 no. 1/2003 KEYWORDS: Barrier properties, Calendering, Coating, Contact angle, Liquid sorption, Poly(vinyl alcohol), Surface roughness SUMMARY: The influence of the surface characteristics of the paper substrate on the possibility of coating the paper with a thin homogeneous polymer film has been investigated. Solutions of poly(vinyl alcohol), PVA, were used to coat two different paper grades on a pilot scale. Some of the paper speci- mens were calendered at high temperatures (>200°C) since this is known to have a

Volume 3, Issue 4 2007 Article 10 International Journal of Food Engineering Moisture Sorption Behavior, and Effect of Moisture Content and Sorbitol on Thermo- Mechanical and Barrier Properties of Pectin Based Edible Films Neda Maftoonazad, McGill University Hosahalli S. Ramaswamy, McGill University, Macdonald Campus Michele Marcotte, Agriculture and Agri-Food Canada, Food Research and Development Center Recommended Citation: Maftoonazad, Neda; Ramaswamy, Hosahalli S.; and Marcotte, Michele (2007) "Moisture Sorption Behavior, and Effect of Moisture Content and

adhesion, spreading and motility of anchorage-dependent cells ( 3 ). Systems for impedance spectroscopy have also been designed for the analysis of single cells in suspension ( 4 ). Nonetheless, the barrier properties of epithelial cells are essential for their physiology and such measurements must be done on cell monolayers. We have previously used the Tethapod system (SDX Tethered Membranes, Australia) to determine the impedance properties of lipid bilayers ( 5 ). The goal of this study was to determine whether this microdevice could be used for cell culture in order