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Preparation of reverse osmosis membranes by surface modification of polymeric films. I. Surface acetylation of cellulose

✍ Scribed by J. J. Hillman

Publisher: John Wiley and Sons
Year: 1975
Tongue: English
Weight: 654 KB
Volume: 19
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1975.070190619

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✦ Synopsis

Abstract

Surface acetylation of cellophane to afford an asymmetric membrane having high desalination ability (as high as 98% sodium chloride rejection) is described. The films were characterized by multiple‐internal‐reflectance microscopy (MIR), dyeing tests, light microscopy, and determination of water and sodium chloride transport properties in reverse osmosis cells. Surface modification employing acetyl chloride and acetic anhydride was studied in detail: the influence of the cellophane employed, the degree of cellophane activation, reaction time, reagent concentration, and diluent were assessed. Mixed acetylation reactions are also discussed as well as an evaluation of various postconditioning treatments used to increase desalination.

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