Mechanisms of Moisture Sorption in Barrier Polymers Used in Food Packaging: Amorphous Polyamide vs. High-Barrier Ethylene-Vinyl Alcohol Copolymer Studied by Vibrational Spectroscopy

2003 ◽  
Vol 204 (4) ◽  
pp. 704-713 ◽  
Author(s):  
Jose M. Lagaron ◽  
Enrique Gimenez ◽  
Ramon Catala ◽  
Rafael Gavara
Keyword(s):  
Vibrational Spectroscopy ◽  
Vinyl Alcohol ◽  
Food Packaging ◽  
Moisture Sorption ◽  
Ethylene Vinyl Alcohol ◽  
Ethylene Vinyl Alcohol Copolymer ◽  
Barrier Polymers

scholarly journals Development and Characterization of Electrospun Fiber-Based Poly(ethylene-co-vinyl Alcohol) Films of Application Interest as High-Gas-Barrier Interlayers in Food Packaging

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2061
Author(s):  
Beatriz Melendez-Rodriguez ◽  
Sergio Torres-Giner ◽  
Lorenzo Zavagna ◽  
Chris Sammon ◽  
Luis Cabedo ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Food Packaging ◽  
Electrospun Fiber ◽  
Tensile Modulus ◽  
Ethylene Vinyl Alcohol ◽  
Nanocomposite Fiber ◽  
General Terms ◽  
Hybrid Copolymer ◽  
Poly Ethylene ◽  
Barrier Polymers

In the present study, poly(ethylene-co-vinyl alcohol) with 44 mol % ethylene content (EVOH44) was managed to be processed, for the first time, by electrospinning assisted by the coaxial technology of solvent jacket. In addition to this, different suspensions of cellulose nanocrystals (CNCs), with contents ranging from 0.1 to 1.0 wt %, were also electrospun to obtain hybrid bio-/non-bio nanocomposites. The resultant fiber mats were thereafter optimally annealed to promote interfiber coalescence at 145 °C, below the EVOH44 melting point, leading to continuous transparent fiber-based films. The morphological analysis revealed the successful distribution of CNCs into EVOH44 up to contents of 0.5 wt %. The incorporation of CNCs into the ethylene-vinyl alcohol copolymer caused a decrease in the crystallization and melting temperatures (TC and Tm) of about 12 and 7 °C, respectively, and also crystallinity. However, the incorporation of CNCs led to enhanced thermal stability of the copolymer matrix for a nanofiller content of 1.0 wt %. Furthermore, the incorporation of 0.1 and 0.5 wt % CNCs produced increases in the tensile modulus (E) of ca. 38% and 28%, respectively, but also yielded a reduction in the elongation at break and toughness. The oxygen barrier of the hybrid nanocomposite fiber-based films decreased with increasing the CNCs content, but they were seen to remain high barrier, especially in the low relative humidity (RH) regime, i.e., at 20% RH, showing permeability values lower than 0.6 × 10−20 m3·m·m−2·Pa−1·s−1. In general terms, an optimal balance in physical properties was found for the hybrid copolymer composite with a CNC loading of 0.1 wt %. On the overall, the present study demonstrates the potential of annealed electrospun fiber-based high-barrier polymers, with or without CNCs, to develop novel barrier interlayers to be used as food packaging constituents.

scholarly journals Immobilization of β-cyclodextrin in ethylene-vinyl alcohol copolymer for active food packaging applications

2010 ◽  
Vol 353 (1-2) ◽  
pp. 184-191 ◽  
Author(s):  
Carol López-de-Dicastillo ◽  
Miriam Gallur ◽  
Ramón Catalá ◽  
Rafael Gavara ◽  
Pilar Hernandez-Muñoz
Keyword(s):  
Vinyl Alcohol ◽  
Food Packaging ◽  
Ethylene Vinyl Alcohol ◽  
Ethylene Vinyl Alcohol Copolymer ◽  
Active Food Packaging
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