<p>The thermal sensitivity of a random copolymer of <i>N</i>-isopropylacrylamide with maleic acid (CPL) was studied at its constant concentration of 0.5 • 10⁻² g cm⁻³ in aqueous solutions containing NaCl at concentrations of 0, 0.15, and 0.5 mol L⁻¹ depending on temperature and pH. When heated, CPL solutions exhibited thermal sensitivity, which was manifested in the occurrence of phase separation. It was found that the pH sensitivity is observable in the acidic region: the phase separation temperature increased with increasing pH. The introduction of NaCl into solutions led to a decrease in the phase separation temperature. An analysis of the composition of scattering structures existing in aqueous solutions without and with NaCl additions far from the phase transition temperature and upon heating was carried out. In the region of phase separation, large aggregates are formed, the size of which decreases with increasing NaCl concentration.</p>