Laminar morphology development and oxygen permeability of LDPE/EVOH blends

Sang Young Lee, Sung Chul Kim

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

Morphology and oxygen barrier properties of LDPE/EVOH blends have been studied. Laminar dispersion of 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. Various laminar morphologies were observed and the main factors determining the morphology of the blends were viscosity ratio of the components, processing conditions, and compatibilizer level. Oxygen permeation tests have shown that thinner and longer EVOH layers in larger numbers were more effective in reducing the oxygen permeability. The oxygen permeability of the compatibilized blend having 6 phr of LLD-g-MAH was reduced by a factor of 740. The correlation between morphology and oxygen permeability was explained as a function of the EVOH layer size (L × R) and the number of EVOH layers (N), which were closely related to the predeformed domain size (Lo × Ro). The high Weber number (resulted from large Lo × Ro and low interfacial tension) and low viscosity ratio yielded large L × R. However, small Lo × Ro produced high N. Experimental results of oxygen permeability were well correlated with (L × R) × N.

Original languageEnglish
Pages (from-to)463-475
Number of pages13
JournalPolymer Engineering and Science
Volume37
Issue number2
DOIs
Publication statusPublished - 1997

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

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