RESTORATION OF THE POROUS STRUCTURE OF POLYSULPHONE-BASED ULTRAFILTRATION MEMBRANES
Abstract
P
olysulfone hollow fiber ultrafiltration membranes cast from the polysulfone solution in dimethylacetamide containing PEG 400 as porophore and hydrophilized with additives of polyvinylpyrrolidon K-90 have been tested after long term storage. The specific influence of the dilute solutions of PEG with M = 6000–20000 on the membrane permeability has been found. The short term treatment by PEG dilute solutions has restored the pore structure and the membrane permeability following the capillary contraction. It is assumed that the detected effect is caused by the wedge action of PEG due to its interaction with polyvinylpyrrolidone in the membrane matrix.
About the Authors
А. V. BILDYUKEVICHBelarus
V. V. USOSKY
Belarus
Е. S. VARSLOVAN
Belarus
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