Fracture behaviour of poly[ethylene-(vinyl alcohol)]/organo-clay composites

2009 ◽  
Vol 58 (6) ◽  
pp. 648-655 ◽  
Author(s):  
Maria L Maspoch ◽  
Edgar Franco-Urquiza ◽  
José Gamez-Perez ◽  
Orlando O Santana ◽  
Miguel Sánchez-Soto
Keyword(s):  
Vinyl Alcohol ◽  
Fracture Behaviour ◽  
Ethylene Vinyl Alcohol ◽  
Organo Clay ◽  
Poly Ethylene

Poly-ethylene-vinyl alcohol microgels prepared through salting out: Rationalizing the aggregation process and tuning the microstructural properties

Polymer ◽  
2018 ◽  
Vol 137 ◽  
pp. 122-131 ◽  
Author(s):  
Marco Perfetti ◽  
Irene Russo Krauss ◽  
Aurel Radulescu ◽  
Nino Ruocco ◽  
Gerardino D'Errico ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Aggregation Process ◽  
Microstructural Properties ◽  
Salting Out ◽  
Ethylene Vinyl Alcohol ◽  
Poly Ethylene

Synthesis and characterization of poly(ethylene-vinyl alcohol)-g-poly(butyl acrylate) copolymers

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
M. Azam ◽  
John V. Dawkins
Keyword(s):  
Acid Chloride ◽  
Butyl Acrylate ◽  
Vinyl Alcohol ◽  
Graft Copolymers ◽  
Size Exclusion ◽  
X Ray Diffraction ◽  
Ethylene Vinyl Alcohol ◽  
Exclusion Chromatography ◽  
Poly Ethylene

AbstractEthylene-vinyl alcohol (EVOH) copolymers with different vinyl alcohol (VOH) mole % have been grafted by the carboxyl terminated poly(butyl acrylate) (PBA) prepolymers by the grafting-onto method. The carboxyl terminated PBA were synthesised by solution radical polymerization using 4,4 azobis(cyanovaleric acid) (ACVA) as initiator and thioglycolic acid (TGA) as matched chain transfer agent and then converting carboxyl groups into acid chloride terminated prepolymer by reacting with oxalyl chloride. The acid chloride terminated prepolymers were reacted with EVOH copolymer backbone to synthesize graft copolymers. The graft copolymers were characterized by the Size Exclusion Chromatography (SEC), Fourier Transfer Infrared spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR) spectroscopy. Results from these analyses confirmed the grafting of PBA side chain on to EVOH backbone. Differential Scanning Calorimetery (DSC), Dynamic Mechanical Thermal Analysis (DMTA) and x-ray diffraction studies of graft copolymers showed that the morphology of crystalline EVOH polymers has been disrupted due to grafting of amorphous PBA chains.

Surface characterization of poly(lactic acid)/everolimus and poly(ethylene vinyl alcohol)/everolimus stents

Drug Delivery ◽  
2010 ◽  
Vol 17 (6) ◽  
pp. 376-384 ◽  
Author(s):  
Ming Wu ◽  
Lothar Kleiner ◽  
Fuh-Wei Tang ◽  
Syed Hossainy ◽  
Martyn C. Davies ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Vinyl Alcohol ◽  
Surface Characterization ◽  
Poly Lactic Acid ◽  
Ethylene Vinyl Alcohol ◽  
Poly Ethylene

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.

Immobilization of enzyme onto poly(ethylene-vinyl alcohol) membrane

1986 ◽  
Vol 28 (2) ◽  
pp. 198-203 ◽  
Author(s):  
Kiyokazu Imai ◽  
Tomoo Shiomi ◽  
Kozo Uchida ◽  
Masamitsu Miya
Keyword(s):  
Vinyl Alcohol ◽  
Ethylene Vinyl Alcohol ◽  
Poly Ethylene
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