Synthesis of water vapor barrier membrane by coating of poly(vinyl alcohol) substrate with poly(tert -butyl acrylate)-silica nanocomposite

2008 ◽  
Vol 20 (3) ◽  
pp. 285-290 ◽  
Author(s):  
Reiko Saito ◽  
Daisuke Nakagawa
Keyword(s):  
Water Vapor ◽  
Butyl Acrylate ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Water Vapor Barrier ◽  
Tert Butyl ◽  
Barrier Membrane ◽  
Silica Nanocomposite

Preparation and properties of poly (vinyl alcohol)/sodium caseinate blend films crosslinked with glutaraldehyde and glyoxal

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Bedriye Ucpinar Durmaz ◽  
Ayse Aytac
Keyword(s):  
Water Vapor ◽  
Vinyl Alcohol ◽  
Sodium Caseinate ◽  
Barrier Properties ◽  
Poly Vinyl Alcohol ◽  
Infrared Analysis ◽  
Crosslinking Reaction ◽  
Water Contact ◽  
Casting Technique ◽  
Water Vapor Barrier

Abstract Bio-based films containing poly (vinyl alcohol)/casein have poor mechanical and water vapor barrier properties that limit their use in packaging application. Some properties such as water resistance and tensile strength can be increased by the cross-linking process. For this reason, poly(vinyl alcohol)/sodium caseinate (PVA/SC) blends were crosslinked by adding glutaraldehyde (GLA) and glyoxal (GL) at different ratios in this work. The films were prepared by solution casting technique. Fourier transform infrared analysis (FTIR) confirmed the crosslinking reaction between the components. As a result of the crosslinking, the thicknesses, water vapor barrier properties and water contact angle values of the films have increased. The total soluble matters (TSM) of PVA/SC film decreased with increasing amounts of crosslinkers and GLA crosslinked films exhibited lower TSM. The addition of GLA and GL resulted in more strengthened films as verified by the tensile test. On the other hand, GLA crosslinked films were more flexible than un-crosslinked and GL crosslinked PVA/SC films. The hydrophilic PVA/SC film became more hydrophobic with the increasing amounts of crosslinkers. With the crosslinking, the PVA/SC film became more thermally stable. In conclusion, the crosslinked PVA/SC films were obtained with suitable properties for packaging applications.

Preparation and Characterization of Chitosan/poly( Vinyl Alcohol) Composite Packaging Films

2011 ◽  
Vol 332-334 ◽  
pp. 1739-1742 ◽  
Author(s):  
Ling Li ◽  
Zheng Wei Jin ◽  
Jian Qing Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Water Vapor ◽  
Vinyl Alcohol ◽  
Permeability Coefficient ◽  
Composite Films ◽  
Weight Ratio ◽  
Poly Vinyl Alcohol ◽  
Elongation At Break ◽  
Packaging Films

A novel chitosan/poly(vinyl alcohol) composite packaging films were prepared by the casting method, and the effects of chitosan concentration on the structures, mechanical properties, permeability for oxygen and water vapor were discussed in this study. Mechanical properties of these films, which were evaluated by the tensile test and the barrier properties showed that the elongation at break (E) of the composite films decreased rapidly with the addition of chitosan, whereas, the tensile strength (TS) presented an almost opposite trend. Both the water vapour and oxygen transmission rate values were increased with the increasing amount of the chitosan in the composite films. Based on the obtained results, the better property of the composites films would be prepared chitosan/poly(vinyl alcohol) blends at a weight ratio of 3/5, and the tensile strength and elongation at break of the packaging films were 34.12 MPa, 40.24 % respectively. It was also observed that the water vapor permeability coefficient (Pv) and the oxygen permeability coefficient (P) of chitosan/poly(vinyl alcohol) composite packaging films prepared with weight ratio of 3/5 were 1.99×10-15 g•cm/cm2•s•Pa and 7.98×10-16 cm3•cm/cm2•s•Pa respectively. The composite films in this paper can be used in fresh-keeping or other fields as a kind of green packaging material.

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