Investigating thermodynamics of polyvinylpyrrolidone solutions inwater/acetic acid solvent using intrinsic viscosity

Measurement of the intrinsic viscosity (IV) of dilute solutions containing polyvinylpyrrolidone (PVP)in water-acetic acid (AA) solvent with varying ratios was conducted utilizing an Ubbelohdeviscometer within the temperature range from ۲۵°C to ۴۵°C. The results show that water is a bettersolvent than AA at ambient temperature; however, the solubility of PVP in water decreased as thetemperature rose. Conversely, as the temperature increased, the solubility of PVP in AA alsoincreased. Furthermore, increasing AA concentration in solutions results in an increase in specificviscosity more than water revealing more intermolecular interactions of AA compared to water. Inthis study, the effects of temperature and solvent ratios, which are influential factors on the intrinsicviscosity and hydrodynamic volume of polymer solutions, were analyzed. The results indicate thatpolymer solutions exhibit different behaviors at different temperatures and acid ratios.

کلیدواژه ها:

Polymer Rheology ، Hydrodynamic volume ، Hydrophilic Interactions