Effect of Uniaxial Stretching on Molecular Orientation, Crystallinity and Oxygen Permeability of Ethylene Vinyl Alcohol
-
L. Wang
, E. Jalali Dil and A. Ajji
Abstract
This work studies the effects of uniaxial stretching on molecular orientation, crystallinity, crystallography and oxygen permeability of high barrier multilayer films based on EVOH barrier layer. Film samples were prepared using two different blow-up ratios (BUR) of 1 and 3. Uniaxial stretching was applied at 100°C using a tensile machine equipped with an environmental chamber. Fourier transform infrared (FTIR) spectroscopy was used to examine the molecular orientation in the EVOH layer before and after stretching and confirmed a considerable increase in the molecular orientation in the EVOH layer. Dynamic scanning calorimetry (DSC) and wide-angle X-ray diffraction (XRD) results point to the perfection of EVOH crystal structure by applying uniaxial stretching at high temperatures. Oxygen permeability results showed a considerable 25% decrease after stretching of the sample with lower BUR while a significant 80% reduction in oxygen permeability was observed for the sample prepared at higher BUR. The mechanism involved in increasing oxygen permeability due to the uniaxial stretching at high temperature is discussed in detail.
References
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Articles in the same Issue
- Contents
- Editorial
- Special Issue for Musa R. Kamal
- Special issue contributions
- Constitutive Modeling of Nonlinear Rheological Behavior of Carbon Nanotube-Filled Polypropylene Nanocomposites
- Modeling Short-Range Interactions in Concentrated Newtonian Fiber Bundle Suspensions
- The Polymer Film Casting Process – An Overview
- Micro-Injection Molding of Polymer Nanocomposites Composition-Process-Properties Relationship
- Nanoclay Migration and the Rheological Response of PBAT/LDPE Blends
- Composites of Cysteamine Functionalised Graphene Oxide and Polypropylene
- Effect of Uniaxial Stretching on Molecular Orientation, Crystallinity and Oxygen Permeability of Ethylene Vinyl Alcohol
- Investigation of Microstructures and Air Permeability of Aerogel-Coated Textile Fabric Materials
- In Situ Visualization for Control of Nano-Fibrillation Based on Spunbond Processing Using a Polypropylene/Polyethylene Terephthalate System
- PPS NEWS
- Seikei Kakou Abstracts
- PPS Membership application
Articles in the same Issue
- Contents
- Editorial
- Special Issue for Musa R. Kamal
- Special issue contributions
- Constitutive Modeling of Nonlinear Rheological Behavior of Carbon Nanotube-Filled Polypropylene Nanocomposites
- Modeling Short-Range Interactions in Concentrated Newtonian Fiber Bundle Suspensions
- The Polymer Film Casting Process – An Overview
- Micro-Injection Molding of Polymer Nanocomposites Composition-Process-Properties Relationship
- Nanoclay Migration and the Rheological Response of PBAT/LDPE Blends
- Composites of Cysteamine Functionalised Graphene Oxide and Polypropylene
- Effect of Uniaxial Stretching on Molecular Orientation, Crystallinity and Oxygen Permeability of Ethylene Vinyl Alcohol
- Investigation of Microstructures and Air Permeability of Aerogel-Coated Textile Fabric Materials
- In Situ Visualization for Control of Nano-Fibrillation Based on Spunbond Processing Using a Polypropylene/Polyethylene Terephthalate System
- PPS NEWS
- Seikei Kakou Abstracts
- PPS Membership application