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In addition to the ubiquitous structural relaxation of viscous supercooledliquids, monohydroxy alcohols and several other hydrogen-bonded systems displaya strong single-exponential electrical low-frequency absorption. So far, thisso-called Debye process could be observed only using dielectric techniques.Exploiting a combination of broad-band and high-resolution rheology experimentsfor three isomeric octanols, unambiguous mechanical evidence for the Debyeprocess is found. Its spectral signature is similar to the viscoelasticfingerprint of small-chain polymers, enabling us to estimate the effectivemolecular weight for the supramolecular structure formed by the studiedmonohydroxy alcohols. This finding opens the venue for the application offurther non-dielectric techniques directed at unraveling the microscopic natureof the Debye process and for an understanding of this phenomenon in terms ofpolymer concepts.

Short-chain polymer rigidity due to the Debye process of monohydroxy alcohols