Polymer Solutions with Specific Interactions: Equation of State for Poly(4-hydroxystyrene) + Acetone

Abstract

We have obtained the p-V-T surface of the mixture acetone + poly(4-hydroxystyrene) over the intervals 298 < 77 K < 328,0 < p/MPa < 40, and 0.45 <w< 0.97, w being the weight fraction of acetone.The results obey a p-T-w superposition principle, making it possible to build a master curve when the pressure and the density are reduced with the isothermal compressibility and the density is at a reference pressure, respectively. The master curve depends on a single system-dependent parameter, which takes similar values for quite different mixtures. The master curve allows us to describe the pressure dependence of the density within experimental uncertainty. The bulk modulus of the system can be described quite accurately using a correlation inspired by a perturbation theory which assumes a spherical reference system.The data have been analyzed with two versions of a lattice-fluid model. One of the versions includes, in an approximated way, the existence of hydrogen bonds, both in the polymer and between the polymer and the solvent. However, almost no difference is found between the predictive ability of the two versions, at least for the p-V-T-w surface.

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

“…Figure shows that this is indeed the case for the two systems studied, with δ = 10.93 for the system with n C 6 and δ = 11.19 for the system with ethanol. These values compare well with δ = 11.70 found for P4HS + tetrahydrofuran and δ = 11.44 for P4HS + ethanol 21 and with δ = 10.09 for P4HS + poly(vinylacetate) …”

“…As expected, the effect of pressure is larger as the concentration of solvent increases, reflecting the difference in free volume between polymer and solvent. The low M w of PPG compared to that of P4HS ( M w ∼ 30 000), , accounts for the fact that the differences between the isopleths x = 0 and x = 1 in Figure are smaller than in the previous cases for P4HS + ethanol . The fact that n C 6 is more compressible than ethanol, leads to a larger influence of composition upon the compressibility of the PPG + n C 6 mixture than in the PPG + ethanol.…”

“…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 Hydrogen-Bonded Polymer Solutions: Poly(4-hydroxystyrene) + Ethanol and + Tetrahydrofuran

“…References and Notes rvH = (x, + ax2 + A[(X[ + ax2 + A)2 -4 1 2]1/2}/2 (11) In the case of P4HS + EtOH the situation is slightly more complex since there is self-association in both pure components and also cross-association. This leads to a system of coupled with Nf 11 = Ya'11 = N\, and N¿2) = Ya(2) = dN2, d being the number of hydroxyl groups per polymer molecule.…”

(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].…”