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Composition diagrams have been obtained for the homogeneous radical copolymerisation of acrylic acid and methoxypolyethylene glycol methacrylate (with a degree of oxyethylation of 23) in aqueous solutions. For all initial comonomer ratios, methacrylic ester unit enrichment of copolymers formed at low conversions (less than 10%) was established. Using Mayo–Lewis, Finemann–Ross, and Kelen–Tüdös methods, we determined the relative activities of acrylic acid (0.02–0.07) and methoxypolyethylene glycol methacrylate (1.14–1.20).

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Thermo- and pH-responsive poly(N-[3-(diethylamino)propyl]methacrylamide)s were synthesized by free radical polymerization and RAFT polymerization. The molar masses of the samples were 33,000–35,000 g∙mol−1. Investigations of the dilute solutions showed that the prepared samples were flexible chain polymers. The behavior of the synthesized polymers in the buffer solutions was analyzed by turbidity and light scattering at a pH range of 7–13 and a concentration range of 0.0002–0.008 g·cm−3. When the concentrated solutions were at a low temperature, there were macromolecules and aggregates, which were formed due to the interaction of hydrophobic units. For the investigated samples, the lower critical solution temperatures were equal. The phase separation temperatures decreased as pH increased. The influence of polydispersity index on the characteristics of the samples in the solutions was analyzed. The radii of molecules of poly(N-[3-(diethylamino)propyl]methacrylamide) obtained by RAFT polymerization at this temperature at the onset and end of the phase separation interval were lower than ones for samples synthesized by conventional free radical polymerization.