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Preparation of reverse osmosis membranes by surface modification of polymeric films. I. Surface acetylation of cellulose
Author(s) -
Hillman J. J.
Publication year - 1975
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1975.070190619
Subject(s) - cellophane , membrane , acetic anhydride , diluent , reverse osmosis , chemical engineering , sodium , reagent , chloride , dyeing , desalination , chemistry , materials science , cellulose , polymer chemistry , chromatography , nuclear chemistry , organic chemistry , biochemistry , catalysis , engineering
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.