The extant experimental data for the n-alkanes (pentane-hexadecane) derived from ultrasonic absorption, Brillouin and Rayleigh light scattering, and low frequency shear viscosity measurements are analyzed in terms of a model which decomposes the frequency dependent shear and longitudinal viscosities into contributions arising from trans-gauche rotational isomerism, rotational reorientation, and structural relaxation. The results yield values of the transverse and longitudinal structural relaxation times, and indicate that there is a strong coupling of molecular reorientation to adiabatic compression as well as to shear, presumably because the existing orientational correlations between chains are perturbed by the temperature variations during adiabatic compression.
|Number of pages||7|
|Journal||The Journal of Chemical Physics|
|Publication status||Published - 1985|