Titre :
|
Pressure-induced diffusion in swollen butyl rubber membranes
|
Auteurs :
|
D. Paul ;
D. Carranza ;
UNIVERSITY OF TEXAS DEPARTMENT OF CHEMICAL ENGINEERING
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1973
|
Format :
|
p. 69-78
|
Langues:
|
= Anglais
|
Catégories :
|
PHYSIQUE ETAT DE LA MATIERE
PROCEDES DE SEPARATION
|
Mots-clés:
|
VISCOSITE
;
MEMBRANE
;
DENSITE
;
PRESSION DES FLUIDES
;
GONFLEMENT
|
Résumé :
|
Membranes were prepared from butyl rubber of different levels of chain unsaturation to produce membranes with four different well characterized cross-link densities. Pressure-induced permeation rates through them were measured for various organic liquids which highly swell the membranes. The data conformed to and were analyzed by previously published theories. It was found that the product of the diffusivity of the liquid in the membrane and the pure liquid viscosity is very nearly a constant which is approximately 20% less than observed earlier for polyisoprene membranes. More lightly cross-linked membrane yielded higher liquid fluxes at fixed pressures. Most of the effect is attributed to the higher degree of swelling of these membranes. The diffusion coefficient is essentially independent of crosslink density over the range studied.
|
Source :
|
J. polymer sci., vol Symposium n° 4
|