Phase Behavior of Aqueous Poly(acrylic acid-g-TEMPO)

摘要: Poly(acrylic acid) with grafted TEMPO moieties, PAA-T, phase separates over the pH range 2–4, whereas at lower and higher pH, polymer is water-soluble. The of two-phase region increases linearly content moieties. As evidenced by surface tension measurements, PAA-T molecules have little hydrophobic character. We propose that low an amphoteric that, in addition anionic carboxyl groups, contains cationic species resulting from disproportion pH. Furthermore, we regions occur near isoelectric points polymer, suggesting separation due to electrostatically driven association molecules.