4 research outputs found
Phase Behavior and Heat Capacity of {DPnP + Water} Mixtures at the Temperature Range of 273.15–338.15 K
Research ArticleThe differential scanning calorimetry method (DSC) was used to examine the miscibility in the {dipropylene glycol propyl
ether (DPnP) + water} system
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Measurement and Prediction of the Molar Heat Capacities of Liquid Polyoxyethylene Glycol Monoalkyl Ethers (C<sub><i>n</i></sub>E<sub><i>m</i></sub>)
The
saturation heat capacities of eleven polyoxyethylene glycol
monoalkyl ethers (C<sub><i>n</i></sub>E<sub><i>m</i></sub>) were measured by the calorimetric (DSC) method. The measurements
were performed within the temperature range of (275.15 to 339.15)
K by means of Micro DSCIII (Setaram) calorimeter. Assuming that the
molar heat capacity (<i>C</i><sub><i>p,m</i></sub>) shows an additive character, the contributions to the <i>C</i><sub><i>p,m</i></sub> values of particular functional groups
forming the compounds of C<sub><i>n</i></sub>E<sub><i>m</i></sub> series were calculated. Two models differing in
the manner of molecule division into functional groups, i.e., first-
and second-order additivity group contribution approach, were used.
In the latter, not only the type of functional group but also its
position and the closest neighborhood was taken into account. The
average deviations between the experimental values of <i>C</i><sub><i>p</i></sub> and those estimated on the basis of
the group contributions do not exceed 0.4 % for the compound of the
series under investigation. The group contributions determined in
this study make it possible to predict the molar heat capacity of
monoethers C<sub><i>n</i></sub>E<sub><i>m</i></sub> within the temperature range of (270 to 350) K with an average error
below 1 %