Equation of State of Hydrogen-Bonded Polymer Solutions: Poly(4-hydroxystyrene) + Ethanol and + Tetrahydrofuran

Abstract

We have measured the equation of state surface for the mixtures poly(4-hydroxystyrene) + ethanol, and + tetrahydrofuran below 40 MPa. The results obey a superposition principle that makes it possible to build a master curve once the p-V-T surface is known at a given pressure. The master curve depends on a single system-dependent parameter that, for the two systems studied, takes almost the same value. The results have been analyzed with a lattice fluid model that includes the existence of hydrogen bonds. Even though the model describes the composition dependence of the excess volume, it underestimates the pressure dependence of the density. While the inclusion of hydrogen bonds in the model has a negligible influence on the predictions for the system with tetrahydrofuran, it improves significantly the predictions for the system with ethanol.

Equation of State of Hydrogen-Bonded Polymer Solutions. Poly(propylene glycol) + n-Hexane and Poly(propylene glycol) + Ethanol

“…The purpose of the present work is to carry out a precise study of the p − V − T surface mixtures formed by PPG + n -hexane and PPG + ethanol, over the whole composition range. The data is correlated in terms of the EoS developed by Panayiotou and Sanchez 25 and compared with those previously reported for P4HS + ethanol . A similar study for aqueous systems of PPG, PPG + PEG, and the copolymer will be reported in a future work.…”

“…The p − ρ− T data have been measured using a modified Anton-Paar Model DMA 512 high-pressure vibrating tube densitometer, as in a previous work . The densitometer was calibrated with eight pure substances according to the procedure described elsewhere .…”

“…Recently we have reported p − V − T data for mixtures of poly(4-hydroxystyrene) (P4HS) mixed with either acetone, tetrahydrofuran, ethanol, or [poly(vinylacetate + acetone)] . P4HS is known to self-associate through hydrogen bonds (both intra- and intermolecular) and also to associate with solvents or other polymers. , When the results were analyzed in terms of the Panayiotou−Sanchez model, it was found that only when the second component was able to self-associate, e.g.…”

Equation of state of aqueous polymer systems: poly(propylene glycol)+water

“…The experimental set-up has been described in previous work. 25 The densitometer was calibrated with eight pure substances according to the procedure described elsewhere. 26 To account for the inÑuence of the viscosity of the sample, we have followed the method of Ashcroft et al using glycerol as the reference.…”

(Pressure+volume+temperature) properties for binary oligomeric solutions of poly(ethylene glycol mono-4-octylphenyl ether) with 1-octanol or acetophenone at pressures up to 50MPa

“…In addition to the tabulated PVT data by Danner and High [1], Zoller and Walsh [2] for a variety of polymeric materials and some of polymer solutions and polymer blends, Sandell and Goring [3] and Muller and Rasmussen [4] measured the densities of aqueous oligomeric propylene glycols and aqueous PEG mixtures, respectively. To study the specific interactions between polymers and solvents, Compostizo and coworkers [5][6][7][8] have measured the volumetric properties for various polymer solutions and blends: {poly(4-hydr oxystyrene) + acetone}, {poly(4-hydroxystyrene) + tetrahydrofuran}, {poly(4-hydroxystyrene) + ethanol}, {poly(propylene glycol) (PPG) + n-hexane}, (PPG + ethanol), and (PEG + PPG). Other sources of PVT values for polymeric mixtures are (poly(phenyl oxide) + polystyrene} [9], {polystyrene + poly(vinyl methyl ether)} [10], {poly(vinyl fluoride) + hexafluoropropylene} [11], and {poly-styrene + tetramethyl bisphenol-A polycarbonate} [12].…”