期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 81, 期 6, 页码 1493-1497出版社
JOHN WILEY & SONS INC
DOI: 10.1002/app.1577
关键词
proton uptake; electropolymerized coatings; poly(2-vinylpyridine); titration
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 pK(a) value for the poly(2-vinylpyridine) coating has also been estimated to be 4.5 from the titration curve. (C) 2001 John Wiley & Sons, Inc.
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