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Lee, Sang-Young
Energy Soft-Materials Lab (ESML)
Research Interests
  • Soft Materials for Energy Storage/ Conversion Systems

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Morphology and oxygen barrier properties of LDPE/EVOH blends

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Title
Morphology and oxygen barrier properties of LDPE/EVOH blends
Other Titles
Morphology and oxygen barrier properties of LDPE/EVOH blends
Author
Lee, SYKim, SC
Keywords
INCOMPATIBLE POLYMER BLENDS;  STYRENE TRIBLOCK COPOLYMERS;  POLYETHYLENE BLENDS;  LAMINAR
Issue Date
1996-09
Publisher
CARL HANSER VERLAG
Citation
INTERNATIONAL POLYMER PROCESSING, v.11, no.3, pp.238 - 247
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 (sic) 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 low 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
URI
DOI
10.3139/217.960238
ISSN
0930-777X
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ECHE_Journal Papers
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