Hydraulic permeation of liquids through swollen polymeric networks. III. A generalized correlation

Abstract

SynopsisAn approximate equation was developed that permits calculation of the solvent tracer diffusion coefficient in a homogeneous swollen membrane from the measured hydraulic permeability coefficient. This relation was applied to data for 28 polymer-solvent systems that included 15 different organic solvents and 5 hydrocarbon polymer networks whose equilibrium swellings ranged from 16.1 to 91.5% polymer on a volume basis. The calculated tracer diffusion coefficient divided by the pure solvent self-diffusion coefficient for these systems formed a unique correlation when plotted versus the polymer volume fraction in the membrane. This relation agreed well with tracer diffusion coefficient data in the literature for the benzene-natural rubber system measured by radioactive tagging. Discussion centers on the evidence for the validity of the equation developed and the role of hydrodynamics on diffusion in swollen membranes.

Advances in Solvent‐Resistant Nanofiltration Membranes

“…The observed variations in solvent flux with pressure for our experimental data for Membrane D are shown in F IGURE 2. It can be clearly seen that the solvent flux variation with pressure is linear, unlike that reported by Paul et al [5][6][7] for lightly crosslinked natural rubber membranes. A comparison of solvent transport through hydrophilic and hydrophobic membranes can be made and clearly illustrates the importance of polymer-solvent interactions.…”

“…These results enabled later researchers to understand the importance of polymer-solvent interactions. Paul et al, [5][6][7] on the other hand, studied pure solvent transport through lightly crosslinked natural rubber membranes, as early as 1970. They observed reasonable amounts of swelling, corroborated by the non-linear behavior of flux versus the applied pressure.…”

Sorption and diffusion of aliphatic hydrocarbons into crosslinked natural rubber

“…The swelling of thermally stable networks of styrene butadiene rubber (SBR) by an aromatic oil been the object of numerous investigations [1][2][3][4][5] because it is well known that the presence of such was studied from ambient temperature to 200ЊC penetrants markedly affects the physical properby Bouvier and Gelus. 8 A model based on Fick's ties of polymeric products and the ease of manulaw was developed in which a change in geometry facture.…”

The influence of polarity on flux and rejection behaviour in solvent resistant nanofiltration—Experimental observations

“…However, the nature of possible applications means that understanding rejection behaviour when alcohols are present is of primary importance and low rejections do not necessarily imply restrictions on the technology. • Changes in the degree of membrane swelling, which affects mixture permeability [20,30].…”