Abstract

The acoustic absorption coefficient at 25°C of n-decane, n-dodecane, n-tetradecane and n-hexadecane has been measured as a function of frequency between 10 and 3000 MHz. The spectra show Debye-type relaxation behaviour at frequencies around 1000 MHz. Evidence is found that this relaxation process reflects the kinetics of structural isomerization of the hydrocarbon chains. The relaxation times resulting from the acoustic measurements agree with reorientation times derived from depolarized Rayleigh spectra. Both times increase with chain length of the molecules. A possibly coupling existing between orientational motions and isomeric changes of the normal alkanes is discussed.

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