Thermodynamics of mixtures with strong negative deviations from Raoult’s law. XIII. Relative permittivities for (1-alkanol + cyclohexylamine) systems, and dielectric study of (1-alkanol + polar) compound (amine, amide or ether) mixtures

摘要: Abstract Relative permittivities, e r , at 1 MHz have been measured for (1-alkanol + cyclohexylamine) systems T = (293.15 to 303.15) K and atmospheric pressure. The excess permittivity values, E Kirkwood’s correlation factors, g K the values of this magnitude, also determined these solutions and, using measurements available in literature, mixtures containing a number 1-alkanols n-propylamine, n-butylamine, aniline, N-methylaniline, pyridine, di-n-ethylamine, N,N-dimethylformamide, N,N-dimethylacetamide, di-n-propylether, di-n-butylether, 2,5,8,11,14-pentaoxapentadecane, or propanal. At ϕ 1 (volume fraction) = 0.5, cyclohexylamine change sequence: 1-propanol > 1-butanol > 1-heptanol  curves becomes skewed higher when alcohol size increases. This seems be rather general behavior as is encountered many investigated. It can explained terms weaker lower self-association longer 1-alkanols. analysis data shows that including shorter alcohols are more structured. In addition, with cyclic amine structured than those linear aniline. ( ) (1-alkanol + amine) show similar patterns. Thus, negative ascribed real mixture less ideal solution; positive due system solution. We orientational polarization corresponding P m . functions same sign That is, such magnitudes suggest loss structure compared solution ascribed, least part, weakening polarization.