US EPA

1112905 

Journal Article 

Acoustic, Viscometric, and Spectroscopic Studies of Dipropylene Glycol Monopropyl Ether with n-Alkanols at Temperatures of 288.15, 298.15, and 308.15 K 

Pal, A; Gaba, R; Kumar, H 

2011 

Yes 

Journal of Solution Chemistry
ISSN: 0095-9782
EISSN: 1572-8927 

40 

5 

786-802 

10.1007/s10953-011-9688-0 

WOS:000290544300004 

Speeds of sound have been measured in dipropylene glycol monopropyl ether mixtures with methanol, 1-propanol, 1-pentanol, and 1-heptanol as a function of composition at 288.15, 298.15, and 308.15 K and atmospheric pressure. Measurements of viscosity at 298.15 K and atmospheric pressure have also been made for the same mixtures over the whole composition range. The speeds of sound were combined with our previous densitity results to obtain the isentropic compressibility kappa(S). The molar volumes were multiplied by the isentropic compressibilities to obtain estimates of K(S,m) and its excess counterparts K(S,m)(E). The K(S,m)(E) values are negative over the entire range of composition for all mixtures. Deviations in viscosity eta from the mixing relation Sigma x(i) ln eta(i) and excess Gibbs energies of activation for viscous flow Delta G*(E) have been derived for all of these systems. Also, from the speed of sound results, the apparent molar compressibilities (K) over bar (0)(phi,i) of the components have been calculated at infinite dilution. The variations of these properties with the composition, temperature and the number of carbon atoms in the alcohol molecule are discussed in terms of molecular interactions. The experimental results have also been discussed on the basis of IR measurements. 

Dipropylene glycol monopropyl ether; n-Alkanol; Speeds of sound; Binary mixtures; Viscosity