Collect. Czech. Chem. Commun. 2005, 70, 2014-2026

Solvent-Induced Association of Polymers: Phase Stability

Julius Pouchlý*, Antonín Živný and Antonín Sikora

Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic


In the preceding paper, basic thermodynamic functions have been derived for a solution of macromolecules associating by means of functional groups (stickers), thus forming junctions, each of which consists of m stickers and bm molecules of solvent. In the present communication, phase stability of the systems under consideration is analyzed. For several values of parameters m and b, spinodal curves are calculated and their minima (i.e. critical solution points) are localized. At higher junction multiplicity values (e.g. at m = 10), a local maximum appears on the spinodal, dividing it into two lobes, each displaying a different critical point. The effect of the stoichiometric parameter b on splitting the spinodal and on positions of the critical solution points is described.

Keywords: Polymer association theory; Multiple chain junctions; Solvent-complexed chain junctions; Folded spinodal curves; Two critical solution points; Thermodynamics.

References: 3 live references.