Experimental studies of Debye-like process and structural relaxation in mixtures of 2-ethyl-1-hexanol and 2-ethyl-1-hexyl bromide.

摘要: Binary solutions of 2-ethyl-1-hexanol (2E1H) with 2-ethyl-1-hexyl bromide (2E1Br) are investigated by means dielectric, shear mechanical, near-infrared, and solvation spectroscopy as well dielectrically monitored physical aging. For moderately diluted 2E1H the slow Debye-like process, which dominates dielectric spectra neat monohydroxy alcohol, separates significantly from α-relaxation. example, separation in equimolar mixtures amounts to four decades frequency. This situation highly resolved processes allows one demonstrate unambiguously that aging is governed α-process, but even under these ideal conditions Debye process remains undetectable mechanical experiments. Furthermore, experiments show constant charge microscopic polarization fluctuations take place on time scale structural process. The hydrogen-bond populations via near-infrared indicate presence a critical alcohol concentration, xc ≈ 0.5‐0.6, thereby confirming data. In pure reduced intensity present addition main relaxation. taken sign intermolecular cooperativity probably mediated halogen bonds. © 2012 American Institute Physics.