Effect of evaporation step on macrovoid formation in wet-cast polymeric membranes

A systematic study was carried out of the effect of the initial casting solution concentration, film thickness, and duration of the evaporation step on the occurrence and prominence of macrovoid pores in cellulose acetate membranes cast from acetone solutions via the dry/wet phase-inversion process....

Full description

Saved in:
Bibliographic Details
Published in:Journal of membrane science 1994-06, Vol.91 (3), p.265-282
Main Authors: Paulsen, Fritz G., Shojaie, Saeed S., Krantz, William B.
Format: Article
Language:English
Subjects:
Cellulose acetate/acetone
Macrovoid formation
Membrane preparation and structure
Microporous and porous membranes
Theory
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A systematic study was carried out of the effect of the initial casting solution concentration, film thickness, and duration of the evaporation step on the occurrence and prominence of macrovoid pores in cellulose acetate membranes cast from acetone solutions via the dry/wet phase-inversion process. The duration of the evaporation step is shown to have a strong influence on macrovoid formation mainly through its influence on the solvent concentration gradient and casting solution viscosity at the instant of immersion into the precipitation bath. The results of this study are interpreted using predictive models for the evaporative casting process and for macrovoid formation
ISSN:0376-7388
1873-3123
DOI:10.1016/0376-7388(94)80088-X