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http://nopr.niscpr.res.in/handle/123456789/15650| Title: | Excess molar volumes and excess partial molar volumes of diethylene glycol monoethyl ether - n-alcohol mixtures at 298.15 K |
| Authors: | Pal, Arnalendu Dass, Gurcharan |
| Issue Date: | Mar-1999 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Excess
molar volumes VmE have been measured for binary mixtures of
diethylene glycol monoethyl ether with methanol, ethanol, 1- propanol, 1-pentanol
and 1-hexanol as a function of
composition using a continuous-dilution dilatometer at 298.15 K. The excess
molar volumes VmE
are negative over the entire range of composition for the systems diethylene
glycol monoethyl ether + methanol, + ethanol , and + 1-propanol and
positive for the remaining systems, diethylene glycol monoethyl ether + 1-pentanol, and + 1-hexanol. The measured VmE
values increase towards positive direction with increase in chain
length of the n-alcohol. The VmE
results have been used to estimate the excess partial molar volumes VmE .i of the components
and have also been analysed using the Prigogine - Flory – Patterson (PFP)
theory. An analysis of each of the three contributions viz. interactional, free
volume and internal pressure to VmE shows that the free volume effect
and internal pressure contribution are negative for all the mixtures, whereas
the interactional contribution is negative for methanol and positive for
remaining systems. The behaviour of VmE , VmE .i and  12
(Flory's interaction parameter) with composition
and
the number of carbon atoms in the alcohol molecule is discussed.
|
| Page(s): | 237-243 |
| Appears in Collections: | IJC-A Vol.38A(03) [March 1999] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 38A(3) 237-243.pdf | 1.41 MB | Adobe PDF | View/Open |
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