Michèle Couchon, Phuong Nguyen Thi Hong, G. Delmas
Sep 15, 1978
Citations
0
Influential Citations
7
Citations
Journal
Canadian Journal of Chemistry
Abstract
Heats and free energies of mixing have been measured at 298 K for tridodecylamine in n-C7, and eight branched isomers, n-C8 and one branched isomer, and a branched hexane. Heats of mixing are such that these systems can be divided in three classes. Class A includes n-C7, and n-C8. Class B includes isomers which do not have two substituents on neighbouring carbon atoms, i.e. 2-MeC6 2,2-diMeC5, 2,4-diMeC5, 2,2,4-triMeC5. Class C which includes isomers having substituents on neighbouring carbon atoms; 2,3-diMeC5, 2,2,3-triMeC4, 3-MeC6, 3,3-diMeC5, 3-EtC5, has smaller values of heats of mixing . These results are interpreted as not showing an extensive destruction of the correlations of orientations of the dodecyl chains by the linear alkanes of class A. The larger heats of class B are indicative of more disorientations of the long chains by the globular isomers. The smaller values of the heats for class C are seen as the balance of a positive disordering contribution and a negative one. The negative contribu...