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Journal of Chemistry
Volume 2015 (2015), Article ID 932819, 7 pages
http://dx.doi.org/10.1155/2015/932819
Research Article

Phase Behavior and Heat Capacity of {DPnP + Water} Mixtures at the Temperature Range of 273.15–338.15 K

Department of Physical Chemistry, Faculty of Chemistry, University of Łódź, Pomorska 165, 90-236 Łódź, Poland

Received 9 December 2014; Accepted 16 February 2015

Academic Editor: Eri Yoshida

Copyright © 2015 Mariola Tkaczyk et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The differential scanning calorimetry method (DSC) was used to examine the miscibility in the dipropylene glycol propyl ether (DPnP) + water system. Based on recorded curves of differential heat flow on temperature, HF , the range (composition, temperature) of the occurrence of miscibility gap, the values of lower critical solution temperature (LCST), and critical concentration were determined. On the basis of the experimentally determined specific heat capacity data the partial molar heat capacities () of DPnP in the mixtures with water were calculated. Analyzing changes in the course of function, the boundary of transition from a homogeneous solution was determined, in which the monomers of amphiphile dominate, to the region, in which aggregates of the cluster type appear.