Aggregative processes in aqueous solutions of isomeric 2-butoxyethanols at 298.15 K

被引:77
作者
Douhéret, G
Davis, MI
Reis, JCR
Fjellanger, IJ
Vaage, MB
Hoiland, H
机构
[1] Univ Clermont Ferrand, Lab Thermodynam Solut & Polymeres, F-63177 Aubiere, France
[2] Univ Texas, Dept Chem, El Paso, TX 79968 USA
[3] Univ Lisbon, Fac Ciencias, Ctr Electroquim & Cinet, Dept Quim & Bioquim, P-1749016 Lisbon, Portugal
[4] Univ Bergen, Dept Chem, N-5007 Bergen, Norway
关键词
D O I
10.1039/b208598d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ultrasound speed measurements across the entire composition range of aqueous mixtures of both isobutoxyethanol (iC(4)E(1)) and tert-butoxyethanol (tC(4)E(1)) have been made at 298.15 K with a sonic solution monitor that employs a pulse echo overlap technique. In addition, densities of aqueous mixtures of tC(4)E(1) were determined using a vibrating tube densimeter. These new data were complemented with literature values for densities of aqueous mixtures of tC(4)E(1) and for densities and sound speeds of aqueous mixtures of n-butoxyethanol (nC(4)E(1)). In all cases, density values were converted to molar volumes, V-m, and excess molar volumes, V-m(E). Estimates of the isentropic molar compression, K-S,K-m [= -(partial derivativeV(m)/partial derivativep)(S)], and of its excess counterpart, K-S,m(E), were obtained from the combination of the ultrasound speeds and density values. Data reduction procedures were used to generate consistent sets of values for thermodynamic properties of isomeric amphiphiles with increasing degree of alkyl branching. The graphs for the composition dependence of excess partial molar volumes and isentropic compressions of water show enhanced visual impact. These graphs are used for presenting evidence for identifying the prevailing patterns of molecular aggregation. Segmented-composition models, including a version onto which a mass action component has been grafted, are employed, together with a simplified pseudo-phase model, to analyse the various excess molar quantities. The experimental evidence thus obtained is used to relate the effect of chain branching with the degree of self-aggregation of amphiphiles in aqueous solution. An unexpectedly low self-aggregation among iC(4)E(1) molecules is found and discussed in terms of vicinity to the lower critical solution temperature.
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收藏
页码:6034 / 6042
页数:9
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