Abstract
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 × 104 and 1.45 × 104, 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/cm3 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.
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Zakharova, N.V., Filippov, A.P., Zelinskii, S.N. et al. 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. Polym. Sci. Ser. A 61, 1–8 (2019). https://doi.org/10.1134/S0965545X19010127
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DOI: https://doi.org/10.1134/S0965545X19010127