Morphology and oxygen barrier properties of LDPE/EVOH blends

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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.
Publisher
CARL HANSER VERLAG
Issue Date
1996-09
Language
ENG
Article Type
Article
Keywords

INCOMPATIBLE POLYMER BLENDS; STYRENE TRIBLOCK COPOLYMERS; POLYETHYLENE BLENDS; LAMINAR MORPHOLOGY; EXTRUSION; PHASE; PERMEABILITY; MEMBRANES; BEHAVIOR

Citation

INTERNATIONAL POLYMER PROCESSING, v.11, no.3, pp.238 - 247

ISSN
0930-777X
URI
http://hdl.handle.net/10203/6661
Appears in Collection
CBE-Journal Papers(저널논문)
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