The permeation behavior of He, CO2 and N2 through the films of two different types of poly - (vinyl acetate—vinyl alcohol) (I) was studied, one of which was prepared by partial saponification of poly (vinyl acetate) and of a block type and the other was obtained by re-acetylation from poly- (vinyl alcohol) and a random-type copolymer. The comparison of gas permeability coefficients in these I
... [Show full abstract] films of the same copolymer composition leads to the conclusion that the gas permeation rate through the block type copolymer was lower than that through the random type copolymer. © 1976, The Society of Polymer Science, Japan. All rights reserved.