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pH‐dependent permeation through polysulfone ultrafiltration membranes prepared by ultraviolet polymerization technique
Author(s) -
Shim Jin Kie,
Lee Yong Bum,
Lee Young Moo
Publication year - 1999
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/(sici)1097-4628(19991003)74:1<75::aid-app8>3.0.co;2-4
Subject(s) - polysulfone , permeation , membrane , acrylic acid , polymer chemistry , ultrafiltration (renal) , polymerization , chemistry , x ray photoelectron spectroscopy , chemical engineering , nuclear chemistry , materials science , chromatography , polymer , organic chemistry , copolymer , biochemistry , engineering
pH‐sensitive poly(acrylic acid)‐grafted membranes were prepared by an ultraviolet irradiation technique in air at room temperature. Peroxides produced on the membrane surface was quantified by 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH), which indicated that there existed an effective irradiation time for graft polymerization. Through X‐ray photoelectron spectroscopy (XPS) measurements, the effective thickness of poly(acrylic acid) grafted onto the surface of a polysulfone membrane was determined to be around 80–100 nm. pH‐dependent permeation behavior was noted from the permeation of riboflavin as a model solute. A distinctive flux decline of riboflavin appeared in the range of pH 4–5. Therefore, the flux of the intelligent membrane was controlled by changes in the pH of the external solution, attributed to the changes in the conformation of the grafted chains of poly(acrylic acid), because of the electrostatic force among the dissociated carboxyl groups. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 75–82, 1999