The Journal of Physical Chemistry B, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Strong interactions of polyelectrolytes (PEs) with water have been used to control many technological applications PEs in cryopreservation as well anti-icing or lubricating coatings. In all these cases, knowledge the phase diagrams PE is important, particularly at low temperatures, where ice more stable. this work, we study negatively and positively-charged by using infrared spectroscopy (IR) differential scanning calorimetry (DSC). The results show a coexistence curve equilibrium PE-rich water. for positively- negatively-charged were similar, nearly 40% volume fraction polymer remains unfrozen. Comparison collected data predictions from theoretical model based on Gibbs-Thomson Flory-Huggins models reveals that concentrated PE-water has closely associated counterions, entropy counterions does not play dominant role. This finding surprising since are expected strongly dissociated charges under conditions. Interestingly, also found evidence stable unfrozen change upon further cooling -100 °C. These observations important controlling formation critical.

Language: Английский