Abstract
Linear statistic N-isopropylacrylamide copolymer containing 11.6 mol% of 4-vinylpyridine was synthesized by free radical polymerization. The copolymer was investigated in 0.015 g cm−3 aqueous solutions using methods of static and dynamic light scattering and turbidimetry in the temperature region from 10 to 50 °C. Phase separation was registered in solutions in pH interval from 1.9 to 11.5 while heating. Temperatures of the onset and the termination of the phase separation decreased with pH increase in acid and neutral conditions. Intensive aggregation of macromolecules was registered starting from the temperatures of the onset of the phase separation. The aggregate size and their fraction in solution increased rapidly within the phase separation temperature interval; the composition of the dissolved species was strongly dependent on temperature as well as on pH.
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