Table of Contents
Textures and Microstructures
Volume 14 (1991)–18
http://dx.doi.org/10.1155/TSM.14-18.415

Textures and Barrier Properties of Ethylene-Vinylalcohol Copolymer Films

1Plastics Laboratory, Nippon Petrochemicals Co.Ltd. 2- 3- 2, Yako, Kawasaki-ku, Kawasaki 210, Japan
2Faculty of Engineering, Yokohama Nat. University, 156, Tokiwadai, Hodogaya-ku, Yokohama 240, Japan

Copyright © 1991 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of textures produced by various types of deformation processing on gas barrier property of copolymer film has been studied in the case of ethylene-vinylalcohol (EVOH) resin which is known as a semicrystalline polymer with low gas permeability.

The heavily cold rolling and cold stretching give rise to highly oriented molecular structures and strong crystallographic textures, which reduce gas permeability of the film at high humidity. It was found, in particular, that the increased tri-axial orientation type texture and resulting molecular structure changes due to the plane strain compression type deformation, such as rolling, improved greatly the barrier property of the EVOH film.