Thermodynamic characterization of ternary solutions of uncharged polymers

F. Csempesz, K. F. Csáki, M. Nagy

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The thermodynamic interactions in aqueous solutions of uncharged polymers were studied. Using a gel-deswelling method, the water activities (chemical potentials) in binary and ternary (two polymers in one solvent) solutions of methylcellulose (MC), polyvinyl alcohol (PVA) and polyvinyl pirrolidone (PVP), respectively were determined at various polymer volume fractions (1.0 × 10 -2 <v 2 <1.0 × 10 -1). On the theoretical basis of the Flory-Huggins approximations, the relevant solvent-segment (χ 12 or χ 13) and segment-segment pair interaction parameters (χ 23) have been calculated. The solvent activity curves (ln a 1 versus polymer volume fraction) can be well described by a polynomial of third-degree in both the binary and the ternary solutions of the polymers. The solvent-segment interaction parameters exhibit a slight dependence on the polymer concentration. For each binary solution, the χ 12-v 2 function can be fitted by a straight line wich has a small positive slope. In the mixtures of two polymers, the values of the segment-segment (χ 23) interaction parameters were close to zero or sligthly negative (χ 23 ∼0 ± 0.03), indicating that under the studied conditions, the polymers in the ternary solutions are compatible.

Original languageEnglish
Pages (from-to)473-478
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume250
Issue number1-3 SPEC. ISS.
DOIs
Publication statusPublished - Dec 10 2004

Fingerprint

Polymers
Thermodynamics
thermodynamics
polymers
Volume fraction
interactions
Polyvinyls
Polyvinyl Alcohol
Methylcellulose
polyvinyl alcohol
Chemical potential
Polyvinyl alcohols
polynomials
Gels
Polynomials
gels
slopes
aqueous solutions
Water
curves

Keywords

  • Gel-deswelling
  • Polymer mixtures
  • Solvent activity
  • Uncharged polymers

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Thermodynamic characterization of ternary solutions of uncharged polymers. / Csempesz, F.; Csáki, K. F.; Nagy, M.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 250, No. 1-3 SPEC. ISS., 10.12.2004, p. 473-478.

Research output: Contribution to journalArticle

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