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Morphology and Oxygen Barrier Properties of LDPE/EVOH Blends

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Published/Copyright: May 28, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 11 Issue 3

Abstract

The morphology of the dispersed phase in immiscible polymer blends can have a significant effect on the final may be omitted physical properties. Laminar dispersion of an ethylene vinyl alcohol copolymer (EVOH) with high oxygen barrier properties was obtained in the matrix of low density polyethylene (LDPE) when extruded through an annular blown film die. A large range of morphology was observed and indicated that the main factors determining the morphology of the blends were the composition, the viscosity ratio of the components, the processing conditions, and the elongational fields at the exit of the die. Increasing amount of EVOH (from 5 to 20 vol %) resulted in increasing number of stacked layers. Highly elongated laminar structure was formed when the viscosity ratio (ηd(EVOH)/ηm(LDPE)) was close to one and slightly lower. Large predeformed domains in the extruder outlet (before drawing and blowing) with short residence time under high screw rpm and lower viscosity ratio in the die temperature favored the formation of well-developed laminar structure. Oxygen permeation tests have shown high barrier effects due to the formation of the laminar dispersion which acted as barriers to the permeant molecules by providing a long tortuous path.

* Mail address: Prof. Sung-Chul Kim, Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-gu, Taejon, 305-701, Korea
Received: 1995-9-26
Accepted: 1996-2-16
Published Online: 2013-05-28
Published in Print: 1996-09-01

© 1996, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Nineteenth in a Series: US Rubber/Uniroyal Tire Company: Extrusion Innovators
  5. Screw Extrusion
  6. Frame Indifference: Fluid Flow in Single Screw Pumps and Extruders
  7. Modelling of a Viscous Non-Newtonian Polymer Melt in a List/Buss Kneader and Comparison to Experiment
  8. Analytical Study on Flow and Distributive Mixing of a New Type Pin Mixing Section for Screw Extruder
  9. Reactive Processing
  10. Devolatilization with Chemical Reaction in Polymer Solutions
  11. Film
  12. Morphology and Oxygen Barrier Properties of LDPE/EVOH Blends
  13. Molding
  14. Development of a Computer Simulation of SCORIM
  15. The Effect of Injection Molding Conditions on the Mechanical Properties of an In Situ Composite
  16. Structures and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylenes
  17. Microstructure Evolution During Moulding of Particulate-Reinforced Thermoplastic Composites
  18. Defects in Resin Transfer Molded Plaques Due to Resin Age Distribution During Mold Filling
https://doi.org/10.3139/217.960238

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Nineteenth in a Series: US Rubber/Uniroyal Tire Company: Extrusion Innovators
  5. Screw Extrusion
  6. Frame Indifference: Fluid Flow in Single Screw Pumps and Extruders
  7. Modelling of a Viscous Non-Newtonian Polymer Melt in a List/Buss Kneader and Comparison to Experiment
  8. Analytical Study on Flow and Distributive Mixing of a New Type Pin Mixing Section for Screw Extruder
  9. Reactive Processing
  10. Devolatilization with Chemical Reaction in Polymer Solutions
  11. Film
  12. Morphology and Oxygen Barrier Properties of LDPE/EVOH Blends
  13. Molding
  14. Development of a Computer Simulation of SCORIM
  15. The Effect of Injection Molding Conditions on the Mechanical Properties of an In Situ Composite
  16. Structures and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylenes
  17. Microstructure Evolution During Moulding of Particulate-Reinforced Thermoplastic Composites
  18. Defects in Resin Transfer Molded Plaques Due to Resin Age Distribution During Mold Filling
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