Phase Stability of Hydrogen-Bonded Polymer Mixtures. III. Spinodal Diagrams

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Title:Phase Stability of Hydrogen-Bonded Polymer Mixtures. III. Spinodal Diagrams
Creators:
Pouchlý, Julius
Živný, Antonín
Sikora, Antonín
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 64, 1, pp. 31-43
Uncontrolled Keywords:Critical solution temperature, Spinodal diagrams, Quasichemical equilibrium theory, Polymer mixtures, Hydrogen bonds

Abstract

Relations derived on the basis of the Barker-Guggenheim quasichemical theory were used for construction of spinodal diagrams (temperature <i>versus</i> composition) of a mixture of two polymers in which hydrogen bonds and other strong interactions exist. A function dependence of parameters of quasichemical equilibrium, η, was proposed, which has the form of the Boltzmann function at lower temperatures, but at higher temperatures corresponds to random mixing. The spinodal diagrams were constructed for several sets of dependences of η on temperature in a wide temperature range for different chain lengths, <i>r</i>, or for different values of the content of polar groups in one of the polymers. According to circumstances, the phase diagram shows one or two temperature regions of phase instability or the phase instability occurs in a certain range of composition at any temperature. Though the chain length was chosen equal for both polymers, the phase diagrams are asymmetric in the sense that the critical points are shifted towards that border of the diagram which corresponds to the component with a larger relative content of the polar group. The temperature range of phase instability is strongly influenced by small changes in the relative surface area of polar groups in the molecules. <p>

Title:Phase Stability of Hydrogen-Bonded Polymer Mixtures. III. Spinodal Diagrams
Creators:
Pouchlý, Julius
Živný, Antonín
Sikora, Antonín
Uncontrolled Keywords:Critical solution temperature, Spinodal diagrams, Quasichemical equilibrium theory, Polymer mixtures, Hydrogen bonds
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:64
Number:1
Page Range:pp. 31-43
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19990031UNSPECIFIED
ID Code:1454
Item Type:Article
Deposited On:06 Feb 2009 17:09
Last Modified:06 Feb 2009 16:09

Citation

Pouchlý, Julius; Živný, Antonín; Sikora, Antonín (1999) Phase Stability of Hydrogen-Bonded Polymer Mixtures. III. Spinodal Diagrams. Collection of Czechoslovak Chemical Communications, 64 (1). pp. 31-43. ISSN 0010-0765

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