Determination of Solvent Activity in Poly(vinylpyrolidone) + Methanol, + Ethanol, + 2-Propanol, + and 1-Butanol Solutions at 25 °C

Abstract

The activities of methanol, ethanol, 2-propanol, and 1-butanol in poly(vinylpyrolidone) (PVP) (weightaverage relative molar mass, M w ) 10 000) solutions have been measured by the isopiestic method at 25 °C. Sodium iodide and calcium chloride were used as the isopiestic standards for the calculation of activities. A polynomial equation, the original Flory-Huggins equation, and the modified Flory-Huggins equation with concentration-dependent interaction parameters have been used for the correlation of the experimental solvent activity data. The strength of interaction between different alcohols and the polymer was discussed on the basis of the obtained Flory-Huggins interaction parameters.

Photoactivation of CdSe/ZnS Quantum Dots Embedded in Silica Colloids

“…This difference in deactivation behavior can be explained by the different interaction of the solvent molecules with PVP. A comparison of the Flory–Huggins interaction parameter of both systems at 25 °C (PVP in ethanol: −0.5339 and PVP in butanol: −2.0741) implies that the interaction between PVP and butanol is stronger than that between PVP and ethanol 49, 50. As a result, PVP is expected to be more expanded on the nanoparticle surface in butanol.…”

Choosing Appropriate Solvents for ASD Preparation

“…Vapor-sorption isotherms of the systems (a) PVP ( M w = 10.000 g/mol)/ethanol at 25 °C and (b) PVP K25 ( M w = 25.700 g/mol)/DCM at 25 °C. The symbols are experimental data (PVP/ethanol data points from ref and PVP K25/DCM measured in this work), and lines are PC-SAFT calculations using eq .…”

Influence of molar mass of polymer on the solvent activity for binary system of poly N-vinylcaprolactam and water

“…where d = D(T) at a constant T. Thus, at a constant-temperature, the modified Flory-Huggins equation proposed by Bae et al takes the following form [9,23,17] ln…”

“…So far several researchers have studied the (vapour + liquid) equilibrium (VLE) behaviour of some polymers. The recent studies in this field are mainly focused on poly ethylene glycol (PEG) and poly vinylpyrrolidone (PVP) [7][8][9][10][11][12]. In the present work, VLE behaviour of PVCL is considered for the first time.…”