Molecular weight dependence of interaction parameter and demixing concentration in polymer-polymer-good solvent systems. comparison with theory

The dependence of the interaction parameter χAB between two unlike polymers A and B and of their demixing concentration cK on their molecular weight is investigated. The experiments were performed by means of light scattering (spinodal and “optical theta” conditions) on two polymer pairs: polydimeth...

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Published in:Die Makromolekulare Chemie 1987-09, Vol.188 (9), p.2223-2230
Main Authors: Kaddour, Latifa Ould, Anasagasti, Maria Soledad, Strazielle, Claude
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Miscellaneous
Physicochemistry of polymers
Synthetic biopolymers
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description The dependence of the interaction parameter χAB between two unlike polymers A and B and of their demixing concentration cK on their molecular weight is investigated. The experiments were performed by means of light scattering (spinodal and “optical theta” conditions) on two polymer pairs: polydimethylsiloxane‐polystyrene and polydimethylsiloxane‐poly(methyl methacrylate) in various thermodynamically good solvents. The results are in agreement with the predictions of new scaling laws (χAB ∼ M−0,46 and cK ∼ M−0,63) derived from renormalization group calculations.
doi_str_mv 10.1002/macp.1987.021880919
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subjects Applied sciences
Exact sciences and technology
Miscellaneous
Physicochemistry of polymers
Synthetic biopolymers
title Molecular weight dependence of interaction parameter and demixing concentration in polymer-polymer-good solvent systems. comparison with theory
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