On the water-induced critical double point in a polymer solution: the role of isotopic substitution

Ali, Jaffar BM and Venkatachalam, S and Kumar, A (1997) On the water-induced critical double point in a polymer solution: the role of isotopic substitution. In: Pramana - Journal of Physics, 49 (5). pp. 493-504.

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Abstract

This paper examines the effect of substitution of water by heavy water in a polymer solution of polystyrene (molecular weight = 13000) and acetone. A critical double point (CDP), at which the upper and the lower partially-miscible regions merge, occurs at nearly the same coordinates as for the system [polystyrene + acetone + water]. The shape of the critical line for [polystyrene + acetone + heavy water] is highly asymmetric. An explanation for the occurrence of the water-induced CDP in [polystyrene + acetone] is advanced in terms of the interplay between contact energy dissimilarity and free-volume disparity of the polymer and the solvent. The question of the possible existence of a one-phase hole in an hourglass phase diagram is addressed in [polystyrene + acetone + water]. Our data exclude such a possibility.

Item Type:	Journal Article
Publication:	Pramana - Journal of Physics
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Keywords:	Liquid-liquid transitions;critical double point;polymer demixing;isotopic substitution.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Jun 2011 05:12
Last Modified:	17 Jun 2011 05:12
URI:	http://eprints.iisc.ac.in/id/eprint/38340

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