Diffusion and equilibrium studies for the system acrylonitrile‐styrene‐polyethylene

Abstract

The solubilities of acrylonitrile and styrene in low-density polyethylene were measured a t 0" and 27OC. over the entire range of compositions.The ternary solubility data were analyzed in terms of the relationships developed by Krigbaum and Carpenter. It is shown that the behavior of the ternary system may be predicted from the Flory-Huggins interaction constants of the three pairs of binaries. The rates of desorption of acrylonitrile and styrene from 48 mil thick sheets of polyethylene were measured a t 27OC. The solubility and rates of diffusion of various liquids in polyethylene are of interest from a number of Doints of I view. Information on these subjects can lead to a better understanding of the structure of the polyethylene (I), and this information can be of use to the chemical industry for very practical reasons. Recent work ( 2 ) has demon-

Molecular Transport in Membranes

“…Virtually every case where significant interaction occurs between amorphous polymer and penetrant results in a diffusion coefficient which varies (usually in an exponential fashion) with penetrant concentration. This has been largely studied by Long and coworkers (67,68,87,88,724) and others (27,37,32,78,738,764,766). Thus D = Do exp (j3C) While some approach to the estimation of Do may be made in the usual manner, there is not yet any satisfactory correlation between /3 and the interaction energy.…”

Separation of liquid mixtures by using polymer membranes. I. Permeation of binary organic liquid mixtures through polyethylene

“…I n binary permeation, for a given binary mixture containing two members of a homologous series, the lower molecular weight member permeates preferentially. (9) For single component permeation, molecules with a smaller cross section permeate faster, when comparing molecules of similar molecular weight and chemical nature. For binary liquid permeation, molecules with smaller cross sections will permeate at a faster rate than the other.…”

Liquid Permeation through Plastic Films

“…Many expressions have been proposed to relate B to the solubility of solvent in the film and to a diffusivity, Bo, obtained at zero concentration of solvents. The equation most widely accepted (3,6) is:…”