Summary
Hydrophobically associating poly(acrylic acid) was obtained by reaction of a small amount of octadecylamine on the carboxyl groups of the polymer. In pure water, this modified polymer exhibits a very high thickening power. By increasing the ionic strength of the aqueous solution a strong viscosity increase can be obtained instead of the decrease classically observed with polyelectrolytes. For instance, in 1% NaCl the modified poly(sodium acrylate) is of several orders of magnitude more viscous than the precursor polymer.
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Wang, K.T., Iliopoulos, I. & Audebert, R. Viscometric behaviour of hydrophobically modified poly(sodium acrylate). Polymer Bulletin 20, 577–582 (1988). https://doi.org/10.1007/BF00263675
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DOI: https://doi.org/10.1007/BF00263675