ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

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.

On_the_water-induced_critical.pdf - Published Version

Download (609kB)
Official URL: http://www.springerlink.com/content/b50201n90531qx...


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

Actions (login required)

View Item View Item