Abstract
The dissolution behavior of a hydrophobic alkali-swellable emulsion (HASE) in water was examined by dynamic light scattering and pyrene fluorescence probe experiments. The HASE polymer was obtained by the copolymerization of ethyl acrylate (EA), methacrylic acid (MAA), and a macromonomer containing a C20H41 group separated from the polymer backbone by 32 ethylene oxide units. The behavior of the copolymer was followed as a function of the neutralization degree α = [NaOH]/[COOH] of the MAA component. Particles swell with increasing α until α = 0.4 after which polymer dissolution begins. At low α, pyrene, added as a probe to the solution, dissolves in the EA-MAA copolymer phase; whereas at high α, pyrene is largely localized in C20H41 micelles. Pyrene fluorescence measurements show that the striking viscosity increase of the solution with increasing α correlates with polymer dissolution and intermolecular network formation. Key words: associative polymer, hydrophobic substituents, polymeric micelles.
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