Abstract
The recent measurement of what could be interpreted as the signature of hydrogen bond switching in 2-ethyl-1-hexanol monoalcohol [J. Mol. Liq 312(2020)113441] has open again the question about the impact of hydrogen bonds dynamics on the dielectric response of hydrogen bonded liquids. A systematic study of the shear and dielectric response on a series of diverse glass forming systems shows that when comparing the timescales of the dielectric α relaxation and the shear structural relaxation, the dielectric relaxation of 2-ethyl-1,3-hexanediol and glycerol polyalcohols (PA) do not conform to the general trend. Instead, the observed dielectric relaxation for these PAs correlates with a low frequency mode (slower than structural relaxation) emerging in the shear response. We interpret this finding as a signature of the contribution of hydrogen bonds to the relaxation of the polarization. The dielectric response of PAs would then contain overlapped and non-resolved contributions from structural (alpha) relaxation and hydrogen bond dynamics, causing the slowing down of the overall signal relative to the structural relaxation observed by shear measurements.
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