Phase Equilibria In Polymer Research Articles

Phase equilibria in polymer–solvent systems: Progress in the field of fibers

The progress in phase equilibria of polymer-solvent systems is briefly reviewed. The features of phase diagrams intended for production of fibers with high strength, deformation, and thermal properties are considered. Some attention is given to the fundamental role of S.P. Papkov in the creation and development of scientific concepts on phase equilibria in fiber-forming polymers involving solvents.

Phase equilibria in systems with specific CO2–polymer interactions

A lattice-based model for solutions with solute–solvent association is extended to the calculation of phase equilibria in polymer–CO2 systems in this work. The model is simple to use and requires a maximum of two adjustable parameters to correlate both cloud point and sorption data. Moreover, we show that one of these parameters can be obtained from spectroscopic data. Application of the modified model is demonstrated for the calculation of cloud point curves of seven polymer–CO2 systems. Good agreement with experiment was obtained, with average deviations between calculated and experimental data of 1.3%. The predictive capabilities of the model are demonstrated by calculating the sorption behavior of CO2 in polymers using parameters from cloud point data.

Theory of phase equilibria in polymer stabilized colloidal suspensions

The results of calculations describing the observed phase behaviour of polymer stabilized colloidal dispersions based on the Gibbs-Bogolyubov variational approach are presented. The effective pairwise additive macroparticle interaction is assumed to be a superposition of Yukawa potentials. Hardspheres are chosen as the reference system for the disordered phases, while an Einstein model is taken to be a suitable reference system for the ordered phases. In sterically stabilized colloidal dispersions, temperature variations in the range of the repulsive steric interaction between macroparticles are allowed. Additional insight into the temperature dependence of the adsorbed polymer layer thickness is obtained by comparing the results of the variational approach with those obtained using the phenomenological Flory-Huggins theory of phase separation. In order to describe the observed reversible depletion flocculation, the double Yukawa model potential permits changes in the depletion attraction with free polymer concentration.

Phase equilibria in polymer–liquid–liquid systems

AbstractThe phase equilibria in polymer–liquid 1–liquid 2 ternary systems have been calculated on the basis of the Flory‐Huggins theory of polymer solutions. A new approximation method based on the “cluster” concept has been introduced for mixed solvents comprising a solvent and a nonsolvent. This concept has been verified with polystyrene–solvent–methanol systems.

Phase equilibria in polymer–liquid 1–liquid 2 systems

AbstractThere are investigated the relations between the liquid compositions in the two phases formed when a polymer equilibrates in a mixed solvent. By imposing the simplifyng constraint that all of the polymer be located in one of the two phases, an expression for the equilibrium composition ratio, R = (φ1/φ2)/(v1/v2), is obtained through use of the customary expressions for the free energy of polymer solutions: Here subscripts 1, 2, and 3 refer to the two liquids and the polymer, respectively, χ is a free energy parameter, l is the ratio V1/V2 of the molar volumes of the two liquids, φ and v represent the volume fraction in the ternary and binary phases, respectively, and ϵ is an auxiliary variable relating φ and v for the two liquid components. Certain consequences of the equilibrium composition relationship are examined, and there are suggested possible applications to diffusion, light scattering, and solubility. The results of analysis of the two phases formed when crosslinked natural rubber equilibrates with the mixed solvent pairs: benzene–nitromethane and m‐xylene–nitromethane confirm the form of the equilibrium composition relationship, and the values for the free energy parameters required to represent the data for these ternary systems appear to be reasonable.

Phase Equilibria in Polymer—Solvent Systems. III. Three-component Systems1

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Equilibria in Polymer—Solvent Systems. III. Three-component Systems1A. R. Shultz and P. J. FloryCite this: J. Am. Chem. Soc. 1953, 75, 22, 5681–5685Publication Date (Print):November 1, 1953Publication History Published online1 May 2002Published inissue 1 November 1953https://doi.org/10.1021/ja01118a061RIGHTS & PERMISSIONSArticle Views247Altmetric-Citations19LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (617 KB) Get e-Alerts Get e-Alerts