The solid-liquid equilibria in the system polyoxyethylene/phenol

The solid-liquid (S-L) phase diagram and the X-ray diffractogram of a mixture of polyoxyethylene ( M = 2000) with phenol suggest the existence of a crystalline compound consisting of one molecule of phenol and two monomeric units of polyoxyethylene. The congruent melting point of this compound lies...

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Bibliographic Details
Published in:Polymer (Guilford) 1991-01, Vol.32 (7), p.1309-1312
Main Authors: Lapeš, Ivo, Pouchlý, Julius, Biroš, Ján, Baldrian, Josef
Format: Article
Language:English
Subjects:
Applied sciences
crystalline compound
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
polymer-solvent association
polyoxyethylene
Properties and characterization
solid-liquid phase diagram
Thermal and thermodynamic properties
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Summary:The solid-liquid (S-L) phase diagram and the X-ray diffractogram of a mixture of polyoxyethylene ( M = 2000) with phenol suggest the existence of a crystalline compound consisting of one molecule of phenol and two monomeric units of polyoxyethylene. The congruent melting point of this compound lies at 302.6 K. From an analysis of the phase diagram based on the theory of association equilibria, we have found that in the liquid phase: (1) the bond between phenol and polymer is very strong; (2) there exists a whole spectrum of association complexes containing different numbers of phenol molecules bound onto the macromolecule; and (3) the maximal number of bound phenol molecules is higher than in the crystalline compound.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(91)90236-C