The Influence of Composition of Thermo- and pH-Sensitive Copolymers of N-(3-(Diethylamino)propyl)-N-methylacrylamide and N,N-Diethylacrylamide on Their Behavior in Aqueous Solutions

• Published in: Polymer science. Series A, Chemistry, physics Chemistry, physics, 2019, Vol.61 (1), p.1-8
• Main Authors: Zakharova, N. V., Filippov, A. P., Zelinskii, S. N., Danilovtseva, E. N., Annenkov, V. V.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Polymer Sciences; Structure and Properties
• ISSN: 0965-545X; 1555-6107
• DOI: 10.1134/S0965545X19010127

Buffer solutions of random copolymers of N -(3-(diethylamino)propyl)- N -methylacrylamide and N , N -diethylacrylamide containing 7.5 and 5.0 mol % units of N -(3-(diethylamino)propyl)- N -methylacrylamide with molecular masses of 3.07 × 10 4 and 1.45 × 10 4 , respectively, have been studied by methods of light scattering and turbidimetry. The synthesis of copolymers has been performed via reaction of poly(acryloyl chloride) with N , N -diethyl- N ′-methyl-1,3-propanediamine and diethylamine. Aqueous solutions have been studied in the concentration range of 0.0003–0.04 g/cm 3 at pH 7.0–13.0. The intensities of scattered light I and optical transmittance I* have been measured . Phase separation temperatures have been determined. The results obtained have been compared with the data for a copolymer of the same structure, but with 20 mol % N -(3-(diethylamino)propyl)- N -methylacrylamide units. It has been shown that the characteristics of aqueous solutions of copolymers depend on their composition. An increase in the fraction of N -(3-(diethylamino)propyl)- N -methylacrylamide leads to formation of aggregates in the copolymer solutions and to a gain in the phase separation temperatures.