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12. Correlation between barrier layer T g and a thin-film composite polyamide membrane's performance: Effect of chlorine treatment

Author

Maruf, Sajjad H., Ahn, Dae U., Pellegrino, John, Killgore, Jason P., Greenberg, Alan R., and Ding, Yifu

Subjects
*COMPOSITE materials, *THIN films, *ARTIFICIAL membranes, *CHLORINE, *GLASS transition temperature, *SOLUTION (Chemistry), *STATISTICAL correlation, *HYDROGEN-ion concentration, *POLYAMIDES
Abstract

Abstract: In this study we report changes in the glass transition temperature (T g ) of the polyamide barrier layer (PBL) of a commercial RO membrane as a function of chlorine treatment in which concentration and pH were systematically varied. The results indicate a monotonic decrease of T g with increasing exposure time at a given chlorine concentration. Further, both the degree and the rate of T g decrease vary significantly with both the chlorine concentration and pH value of the aqueous chlorine solution. Moreover, the decrease in PBL T g correlates well with the reduction in the salt rejection of the membrane, but the magnitude of the correlation is specific to chlorine concentration and pH values. [Copyright &y& Elsevier]

Published
2012
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