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Imaging of a pH‐sensitive polymer brush on a porous membrane using atomic force microscopy in aqueous solution
Author(s) -
Ito Yoshihiro,
Park Yong Soon,
Imanishi Yukio
Publication year - 1997
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1997.030180302
Subject(s) - permeation , nanoporous , membrane , polymer , methacrylic acid , aqueous solution , polycarbonate , chemical engineering , atomic force microscopy , polymer chemistry , chemistry , protonation , materials science , nanotechnology , copolymer , organic chemistry , ion , biochemistry , engineering
Abstract Poly(methacrylic acid) was grafted on a nanoporous polycarbonate membrane using the glow‐discharge method. Atomic force microscopy showed that the pore size is dependent upon pH in such a way that a low pH the graft chains are protonated and contracted to open the pore, whereas at high pH, the graft chains became extended, thus reducing the pore size. Water permeation through the graft membrane is regulated by the pH value. The permeation rate is low at high pH value and high at low pH. This phenomenon corresponds to the pore size.