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Rheological behavior of pH‐responsive associating ionic polymers of diallyammonium salts and sulfur dioxide
Author(s) -
Umar Yunusa,
Ali Shaikh Asrof,
Hussein Ibnelwaleed,
AbuSharkh Basel
Publication year - 2008
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.28553
Subject(s) - polyelectrolyte , rheology , chemistry , polymer chemistry , viscoelasticity , cationic polymerization , polymer , intrinsic viscosity , hydrophobe , materials science , organic chemistry , composite material , biochemistry
In this study, the viscoelastic behavior of hydrophobically modified polyelectrolytes obtained from the hydrolysis of cationic acid salts (CAS's) as a function of their zwitterion fraction ( x ) and anion fraction ( z ) was studied. The dynamic viscosity (η′) dependence on frequency of polymer solutions of polybetaine/anionic polyelectrolyte (APE) with various compositions of x and z in 0.1 N NaCl showed typical shear thinning behavior. η′ of a solution of CAS 4 (M 2 ‐4 (4 mol % hydrophobe)) attained a maximum value in the presence of 1.67 equiv of NaOH (corresponding to an x : z ratio of 33 : 67) and decreased with any further addition of NaOH. We suggest this maximum to be a result of a combined effect of coil expansion and hydrophobic association. The influence of the temperature and concentration on η′ of CAS 4 (M 2 ‐4) treated with 1.67 equiv of NaOH was also investigated. The rheology of CAS 4 (M 2 ‐4) samples treated with 1.67, 1.81, and 2.0 equiv of NaOH suggested a reversible network. However, for APE 7 (M 2 ‐5 (5 mol % hydrophobe)), elastic behavior was dominant, and the formation of highly interconnected three‐dimensional networks was suggested. At lower x : z ratios, the effect of coil expansion due to a higher APE fraction was more than counterbalanced by the lower degree of intermolecular hydrophobic associations, whereas at higher x : z ratios, coil contraction became the predominant effect. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009