DETERMINATION OF THE NET ELECTRIC CHARGE OF A POLYACRYLAMIDE MOLECULEBY DONNAN POTENTIAL MEASUREMENTS

Authors
TIPPE A
Citation
A. Tippe, DETERMINATION OF THE NET ELECTRIC CHARGE OF A POLYACRYLAMIDE MOLECULEBY DONNAN POTENTIAL MEASUREMENTS, Colloid and polymer science, 271(12), 1993, pp. 1152-1156
Citations number
10
Categorie Soggetti
Polymer Sciences
Journal title
Colloid and polymer science → ACNP
ISSN journal
0303402X
Volume
271
Issue
12
Year of publication
1993
Pages
1152 - 1156
Database
ISI
SICI code
0303-402X(1993)271:12<1152:DOTNEC>2.0.ZU;2-Y
Abstract
The net electric charge z(p) of a polyacrylamide molecule (Praestol, M ol, Wt. 3.4 x 10(6)) in aqueous solution was determined for two pH val ues (7.2 and 10.0) by measuring the Donnan e.m.f. as function of the s olutions NaCl content c (2.7 mM < c < 74 mM). Taking into account a no n-ideal behavior of the counterions (Na+) mobility, the numerical valu es of z(p) turned out to be 3100 and 5500 electric charge units for pH = 7.2 and 10.0, respectively. A measurable contribution of the assume d non-ideal model for the Na+ ions is found for c < 15 mM.