Author:
Weiss DE,Bolto BA,McNeill R,MacPherson AS,Siudak R,Swinton EA,Willis D
Abstract
A series of cross-linked poly(acrylic
acid) and poly(methacrylic acid) resins has been
synthesized. Their titration curves, and those of similar commercial resins,
show that at c. 20� the pH value at half neutralization may be varied within
about one unit by using acrylic or methacrylic acid
monomers, or by changing the degree of cross-linking. The titration curves of
such resins do not have a pronounced plateau although the acidity is due only
to carboxyl groups. Resins with flatter titration curves can be made by
copolymerizing acrylic or methacrylic acids with
methyl methacrylate. Copolymerization reduces the effective acid strength of
carboxylic acid resins but does not always produce a resin with a flatter
titration curve. The effects of salt concentration, calcium ions, and
temperature on the titration curves of a poly(acry1ic acid) resin have been
studied.
Heating the resins in a salt solution from
c. 20 to 80� decreases their effective acidity slightly. A bigger reduction in
acidity with heating is observed with several polymers in which a
"snake" polymer, such as a poly(ethy1ene oxide), is incorporated
within a cross-linked poly(acrylic acid) resin cage.
Cited by
27 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献