scholarly journals Fundamental Investigations Regarding Barrier Properties of Grafted PVOH Layers

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Markus Schmid ◽  
Andreas Benz ◽  
Camelia Stinga ◽  
Daniel Samain ◽  
Klaus Peter Zeyer
Keyword(s):  
Water Vapour ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Temperature Reaction ◽  
Angle Measurements ◽  
Water Vapour Transmission Rate ◽  
Contact Angle Measurements ◽  
Different Types ◽  
Transfer Method ◽  
Water Vapour Barrier

The current work focuses on fundamental investigations regarding the barrier properties of grafted PVOH layers produced by the Transfer Method. The layers (or papers) used for the different experiments were produced and grafted during the course of this work. Papers with different types of PVOH (different Mowiol types) were produced by coating. Experiments using different parameters (temperature, reaction duration, and concentration) were performed using the Transfer Method. Contact angle measurements and Cobb60measurements were carried out on the grafted and untreated PVOH layers. Furthermore, the water vapour transmission rate of the PVOH layers was determined. The results of this work showed that the method of chromatogeny or chromatogenic chemistry improves the water vapour barrier properties of grafted PVOH layers enormously.

Hydrophobicity of Beeswax-Chitosan Latex Coated Paper

2014 ◽  
Vol 936 ◽  
pp. 1077-1081 ◽  
Author(s):  
Wei Wei Zhang ◽  
Li Ying Qian ◽  
Hui Ning Xiao
Keyword(s):  
Water Vapour ◽  
Coating Layer ◽  
Transmission Rate ◽  
Water Repellency ◽  
Barrier Properties ◽  
Coated Paper ◽  
Water Contact ◽  
Drying Temperature ◽  
Water Vapour Transmission Rate ◽  
Water Vapour Barrier

Both water repellency and water vapour barrier properties were endowed at paper surface by coating with beeswax-chitosan latex. It was found that the water vapour transmission rate of coated paper decreased as the drying temperature increased. However, water contact angle was not affected with it. Although the surface morphology deformed at high drying temperature, the roughness values maintained at micro-scale. Further analysis indicated that the water vapour barrier property of coated paper was influenced by the density of the coating layer.

scholarly journals Characterization of Active Edible Films based on Citral Essential Oil, Alginate and Pectin

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1980 ◽  
Author(s):  
Valentina Siracusa ◽  
Santina Romani ◽  
Matteo Gigli ◽  
Cinzia Mannozzi ◽  
Juan Cecchini ◽  
...  
Keyword(s):  
Essential Oil ◽  
Transmission Rate ◽  
Chemical Properties ◽  
Barrier Properties ◽  
Edible Films ◽  
Water Contact ◽  
Good Thermal Stability ◽  
Angle Measurements ◽  
Physico Chemical ◽  
Contact Angle Measurements

Thermal, structural and physico-chemical properties of different composite edible films based on alginate and pectin with the addition of citral essential oil (citral EO) as an agent to improve barrier properties, were investigated. The obtained films were clear and transparent, with a yellow hue that increased with citral EO addition. All the films displayed good thermal stability up to 160 °C, with a slight improvement observed by increasing the amount of citral EO in the composites. Gas transmission rate (GTR) strongly depended on the polymer structure, gas type and temperature, with improvement in barrier performance for composite samples. Also, citral EO did not exert any weakening action on the tensile behavior. On the contrary, an increase of the elastic modulus and of the tensile strength was observed. Lastly, water contact angle measurements demonstrated the dependence of the film wettability on the content of citral EO.

Use of spherical silica particles to improve the barrier performance of coated paper

2019 ◽  
Vol 34 (3) ◽  
pp. 334-342 ◽  
Author(s):  
Mathew J. Cairns ◽  
Beko Mesic ◽  
James H. Johnston ◽  
Matthias B. Herzog
Keyword(s):  
Water Vapour ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Silica Particles ◽  
Filler Materials ◽  
Coated Paper ◽  
Water Vapour Transmission Rate ◽  
Spherical Silica ◽  
Spherical Silica Particles ◽  
Coating Formulation

Abstract The use of clay filler materials in dispersion coatings is a well-established method to provide improved barrier properties to the coated paper substrate, in particular lowering the water vapour transmission rate (WVTR) through the coating. In this paper we demonstrate the use of small spherical silica particles (∼100–220 nm) as an additive to a clay-latex coating formulation is able to provide further improvements to the barrier properties, when compared to the equivalent silica-free coatings. A significant decrease in both the water vapour transmission rate and the direct water uptake of water ({\text{Cobb}_{120}} wettability test) is observed for coatings containing as little as 1 % silica additive.

scholarly journals Karakteristik Edible Film Pati Sagu Alami dan Pati Sagu Fosfat dengan Penambahan Gliserol (Characteristics of Edible Film from Native and Phosphate Sago Starches with the Addition of Glycerol)

2016 ◽  
Vol 36 (03) ◽  
pp. 247 ◽  
Author(s):  
Febby Jeanry Polnaya ◽  
La Ega ◽  
Devidson Wattimena
Keyword(s):  
Tensile Strength ◽  
Water Vapour ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Edible Films ◽  
Edible Film ◽  
Glycerol Concentration ◽  
Sago Starch ◽  
Water Vapour Transmission Rate ◽  
Randomized Experimental Design

The purpose of this study was to evaluate the effect of the addition of several glycerol concentrations in the making of edible film from native and phosphate sago starch on physical, mechanical and barrier properties of the film. A completely randomized experimental design was applied in this study consisting of two factors of treatments, i.e.: native and phosphate sago starch, and the second factor was glycerol concentration with three levels of treatments, i.e.: 0.5, 1.0, and 1.5 % (w/w). The films were characterized for tensile strength, elongation, solubility, transparency, and water vapor transmission rate. Edible films have produced characteristics for tensile strength from 3.05 to 31.49 MPa, elongation from 3.03 to 20.94 %, solubility from 33.44 to 42.43 %, transparency from 0.59 to 4.14 %, and water vapour transmission rate from 7.76 to 15.80 g/m2.h. Glycerol was found to affect the increase of elongation, solubility, and water vapour transmission rate, as well as the decrease of its tensile strength and transparancy. The films made from sago starch phosphate showed to increase the solubility and to have significant effect compared with native sago starch, but not affecting the other properties. ABSTRAKTujuan penelitian ini adalah untuk mempelajari pengaruh penambahan beberapa konsentrasi gliserol pada pembuatan edible film dari pati sagu alami dan pati sagu fosfat terhadap sifat fisik, mekanik dan barrier film. Rancangan yang digunakan adalah rancangan acak lengkap yang terdiri dari dua faktor yaitu perlakuan jenis pati sagu dengan dua taraf perlakuan yaitu: pati sagu alami dan pati sagu fosfat dan tiga taraf konsentrasi gliserol yaitu: 0,5, 1,0 dan 1,5 % (b/b). Peubah yang diamati adalah tensile strength¸ elongasi, daya larut, transparansi, dan laju transmisi uap air. Karakteristik edible film yang dihasilkan meliputi tensile strength adalah 3,05 - 31,49 MPa, elongasi 3,03 - 20,94 %, daya larut 33,44 - 42,43 %, transparansi 0,59 - 4,14 %, dan laju transmisi uap air 7,76 - 15,80 g/m2.jam. Penambahan gliserol menyebabkan elongasi, daya larut, dan laju transmisi uap air meningkat, tetapi tensile strength dan transparansinya menurun. Perlakuan pati sagu fosfat hanya menyebabkan daya larut film meningkat, tetapi tidak untuk sifat-sifat film lainnya.Kata kunci: Edible film; gliserol; pati sagu alami; pati sagu fosfat

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