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Proton uptake by poly(2‐vinylpyridine) coatings
Author(s) -
Tantavichet Nisit,
Pritzker Mark D.,
Burns Charles M.
Publication year - 2001
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.1577
Subject(s) - protonation , titration , pyridine , titration curve , proton , polymer , coating , polymer chemistry , materials science , acid–base titration , ion , chemistry , analytical chemistry (journal) , inorganic chemistry , nanotechnology , composite material , physics , organic chemistry , quantum mechanics
A titration technique has been used to directly measure the proton uptake by ion‐exchange poly(2‐vinylpyridine) coatings as a function of solution pH. Contrary to the common assumption that each nitrogen in the pyridine ring is attached to an H + when the polymer film is fully protonated, the use of the titration technique has shown that the portion of the pyridine sites actually protonated does not exceed 25% anywhere in the pH range where the coating is stable. The p K a value for the poly(2‐vinylpyridine) coating has also been estimated to be 4.5 from the titration curve. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1493–1497, 2001